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DOHA
2017-08-30 16:55:38 +02:00
parent c9e275a4a2
commit 90441092af
123 changed files with 179851 additions and 115 deletions
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core-java-8/.gitignore
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*.class
0.*
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
.resourceCache
# Packaged files #
*.jar
*.war
*.ear
# Files generated by integration tests
*.txt
backup-pom.xml
/bin/
/temp
#IntelliJ specific
.idea/
*.iml
core-java-8/README.md
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=========
## Core Java 8 Cookbooks and Examples
### Relevant Articles:
- [Java 8 Collectors](http://www.baeldung.com/java-8-collectors)
- [Guide to Java 8’s Functional Interfaces](http://www.baeldung.com/java-8-functional-interfaces)
- [Java 8 – Powerful Comparison with Lambdas](http://www.baeldung.com/java-8-sort-lambda)
- [Java 8 New Features](http://www.baeldung.com/java-8-new-features)
- [Lambda Expressions and Functional Interfaces: Tips and Best Practices](http://www.baeldung.com/java-8-lambda-expressions-tips)
- [The Double Colon Operator in Java 8](http://www.baeldung.com/java-8-double-colon-operator)
- [Java 8 Streams Advanced](http://www.baeldung.com/java-8-streams)
- [Introduction to Java 8 Streams](http://www.baeldung.com/java-8-streams-introduction)
- [Guide to Java 8 groupingBy Collector](http://www.baeldung.com/java-groupingby-collector)
- [Strategy Design Pattern in Java 8](http://www.baeldung.com/java-strategy-pattern)
- [Java 8 and Infinite Streams](http://www.baeldung.com/java-inifinite-streams)
- [String Operations with Java Streams](http://www.baeldung.com/java-stream-operations-on-strings)
- [Exceptions in Java 8 Lambda Expressions](http://www.baeldung.com/java-lambda-exceptions)
- [Java 8 Stream findFirst() vs. findAny()](http://www.baeldung.com/java-stream-findfirst-vs-findany)
- [Guide to Java 8 Comparator.comparing()](http://www.baeldung.com/java-8-comparator-comparing)
- [How to Get the Last Element of a Stream in Java?](http://www.baeldung.com/java-stream-last-element)
- [Introduction to the Java 8 Date/Time API](http://www.baeldung.com/java-8-date-time-intro)
- [Migrating to the New Java 8 Date Time API](http://www.baeldung.com/migrating-to-java-8-date-time-api)
- [Guide To Java 8 Optional](http://www.baeldung.com/java-optional)
- [Guide to the Java 8 forEach](http://www.baeldung.com/foreach-java)
- [Get the Current Date, Time and Timestamp in Java 8](http://www.baeldung.com/current-date-time-and-timestamp-in-java-8)
- [TemporalAdjuster in Java](http://www.baeldung.com/java-temporal-adjuster)
- [Finding Max/Min of a List or Collection](http://www.baeldung.com/java-collection-min-max)
- [Java Base64 Encoding and Decoding](http://www.baeldung.com/java-base64-encode-and-decode)
- [The Difference Between map() and flatMap()](http://www.baeldung.com/java-difference-map-and-flatmap)
- [Merging Streams in Java](http://www.baeldung.com/java-merge-streams)
core-java-8/pom.xml
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>core-java-8</artifactId>
<version>0.1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>core-java-8</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<!-- utils -->
<dependency>
<groupId>net.sourceforge.collections</groupId>
<artifactId>collections-generic</artifactId>
<version>${collections-generic.version}</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>${commons-io.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-math3</artifactId>
<version>${commons-math3.version}</version>
</dependency>
<dependency>
<groupId>org.decimal4j</groupId>
<artifactId>decimal4j</artifactId>
<version>${decimal4j.version}</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>${bouncycastle.version}</version>
</dependency>
<dependency>
<groupId>org.unix4j</groupId>
<artifactId>unix4j-command</artifactId>
<version>${unix4j.version}</version>
</dependency>
<dependency>
<groupId>com.googlecode.grep4j</groupId>
<artifactId>grep4j</artifactId>
<version>${grep4j.version}</version>
</dependency>
<!-- web -->
<!-- marshalling -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
<!-- logging -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
<!-- <scope>runtime</scope> -->
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>${org.slf4j.version}</version>
<!-- <scope>runtime</scope> --> <!-- some spring dependencies need to compile against jcl -->
</dependency>
<dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
<groupId>org.slf4j</groupId>
<artifactId>log4j-over-slf4j</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<!-- test scoped -->
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-all</artifactId>
<version>1.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-core</artifactId>
<version>${org.hamcrest.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-library</artifactId>
<version>${org.hamcrest.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<version>${mockito.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.jayway.awaitility</groupId>
<artifactId>awaitility</artifactId>
<version>${avaitility.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>${commons-codec.version}</version>
</dependency>
<dependency>
<groupId>org.javamoney</groupId>
<artifactId>moneta</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>org.owasp.esapi</groupId>
<artifactId>esapi</artifactId>
<version>2.1.0.1</version>
</dependency>
<dependency>
<groupId>com.sun.messaging.mq</groupId>
<artifactId>fscontext</artifactId>
<version>${fscontext.version}</version>
</dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>${joda-time.version}</version>
</dependency>
<dependency>
<groupId>com.darwinsys</groupId>
<artifactId>hirondelle-date4j</artifactId>
<version>${hirondelle-date4j.version}</version>
</dependency>
</dependencies>
<build>
<finalName>core-java-8</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<excludes>
<exclude>**/*IntegrationTest.java</exclude>
<exclude>**/*LongRunningUnitTest.java</exclude>
<exclude>**/*ManualTest.java</exclude>
</excludes>
<testFailureIgnore>true</testFailureIgnore>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>prepare-package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/libs</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>libs/</classpathPrefix>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<archiveBaseDirectory>${project.basedir}</archiveBaseDirectory>
<archive>
<manifest>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<shadedArtifactAttached>true</shadedArtifactAttached>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>com.jolira</groupId>
<artifactId>onejar-maven-plugin</artifactId>
<executions>
<execution>
<configuration>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<attachToBuild>true</attachToBuild>
<filename>${project.build.finalName}-onejar.${project.packaging}</filename>
</configuration>
<goals>
<goal>one-jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
<configuration>
<classifier>spring-boot</classifier>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<configuration>
<executable>java</executable>
<mainClass>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</mainClass>
<arguments>
<argument>-Xmx300m</argument>
<argument>-XX:+UseParallelGC</argument>
<argument>-classpath</argument>
<classpath/>
<argument>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</argument>
</arguments>
</configuration>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>integration</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<executions>
<execution>
<phase>integration-test</phase>
<goals>
<goal>test</goal>
</goals>
<configuration>
<excludes>
<exclude>**/*ManualTest.java</exclude>
</excludes>
<includes>
<include>**/*IntegrationTest.java</include>
</includes>
</configuration>
</execution>
</executions>
<configuration>
<systemPropertyVariables>
<test.mime>json</test.mime>
</systemPropertyVariables>
</configuration>
</plugin>
</plugins>
</build>
</profile>
</profiles>
<properties>
<!-- marshalling -->
<jackson.version>2.8.5</jackson.version>
<!-- logging -->
<org.slf4j.version>1.7.21</org.slf4j.version>
<logback.version>1.1.7</logback.version>
<!-- util -->
<guava.version>22.0</guava.version>
<commons-lang3.version>3.5</commons-lang3.version>
<bouncycastle.version>1.55</bouncycastle.version>
<commons-codec.version>1.10</commons-codec.version>
<commons-math3.version>3.6.1</commons-math3.version>
<decimal4j.version>1.0.3</decimal4j.version>
<commons-io.version>2.5</commons-io.version>
<commons-collections4.version>4.1</commons-collections4.version>
<collections-generic.version>4.01</collections-generic.version>
<unix4j.version>0.4</unix4j.version>
<grep4j.version>1.8.7</grep4j.version>
<lombok.version>1.16.12</lombok.version>
<fscontext.version>4.6-b01</fscontext.version>
<joda-time.version>2.9.9</joda-time.version>
<hirondelle-date4j.version>1.5.1</hirondelle-date4j.version>
<!-- testing -->
<org.hamcrest.version>1.3</org.hamcrest.version>
<junit.version>4.12</junit.version>
<mockito.version>2.8.9</mockito.version>
<assertj.version>3.6.1</assertj.version>
<avaitility.version>1.7.0</avaitility.version>
<!-- maven plugins -->
<maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
<maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
</properties>
</project>
core-java-8/src/main/java/com/baeldung/Adder.java
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package com.baeldung;
import java.util.function.Consumer;
import java.util.function.Function;
public interface Adder {
String addWithFunction(Function<String, String> f);
void addWithConsumer(Consumer<Integer> f);
}
core-java-8/src/main/java/com/baeldung/AdderImpl.java
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package com.baeldung;
import java.util.function.Consumer;
import java.util.function.Function;
public class AdderImpl implements Adder {
@Override
public String addWithFunction(final Function<String, String> f) {
return f.apply("Something ");
}
@Override
public void addWithConsumer(final Consumer<Integer> f) {
}
}
core-java-8/src/main/java/com/baeldung/Bar.java
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package com.baeldung;
@FunctionalInterface
public interface Bar {
String method(String string);
default String defaultMethod() {
return "String from Bar";
}
}
core-java-8/src/main/java/com/baeldung/Baz.java
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package com.baeldung;
@FunctionalInterface
public interface Baz {
String method(String string);
default String defaultMethod() {
return "String from Baz";
}
}
core-java-8/src/main/java/com/baeldung/Foo.java
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package com.baeldung;
@FunctionalInterface
public interface Foo {
String method(String string);
default void defaultMethod() {
}
}
core-java-8/src/main/java/com/baeldung/FooExtended.java
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package com.baeldung;
@FunctionalInterface
public interface FooExtended extends Baz, Bar {
@Override
default String defaultMethod() {
return Bar.super.defaultMethod();
}
}
core-java-8/src/main/java/com/baeldung/UseFoo.java
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package com.baeldung;
import java.util.function.Function;
public class UseFoo {
private String value = "Enclosing scope value";
public String add(final String string, final Foo foo) {
return foo.method(string);
}
public String addWithStandardFI(final String string, final Function<String, String> fn) {
return fn.apply(string);
}
public String scopeExperiment() {
final Foo fooIC = new Foo() {
String value = "Inner class value";
@Override
public String method(final String string) {
return value;
}
};
final String resultIC = fooIC.method("");
final Foo fooLambda = parameter -> {
final String value = "Lambda value";
return this.value;
};
final String resultLambda = fooLambda.method("");
return "Results: resultIC = " + resultIC + ", resultLambda = " + resultLambda;
}
}
core-java-8/src/main/java/com/baeldung/datetime/README.md
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### Relevant Articles:
- [Introduction to the Java 8 Date/Time API](http://www.baeldung.com/java-8-date-time-intro)
core-java-8/src/main/java/com/baeldung/datetime/UseDuration.java
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package com.baeldung.datetime;
import java.time.Duration;
import java.time.LocalTime;
import java.time.Period;
public class UseDuration {
public LocalTime modifyDates(LocalTime localTime, Duration duration) {
return localTime.plus(duration);
}
public Duration getDifferenceBetweenDates(LocalTime localTime1, LocalTime localTime2) {
return Duration.between(localTime1, localTime2);
}
}
core-java-8/src/main/java/com/baeldung/datetime/UseLocalDate.java
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package com.baeldung.datetime;
import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalAdjusters;
class UseLocalDate {
LocalDate getLocalDateUsingFactoryOfMethod(int year, int month, int dayOfMonth) {
return LocalDate.of(year, month, dayOfMonth);
}
LocalDate getLocalDateUsingParseMethod(String representation) {
return LocalDate.parse(representation);
}
LocalDate getLocalDateFromClock() {
LocalDate localDate = LocalDate.now();
return localDate;
}
LocalDate getNextDay(LocalDate localDate) {
return localDate.plusDays(1);
}
LocalDate getPreviousDay(LocalDate localDate) {
return localDate.minus(1, ChronoUnit.DAYS);
}
DayOfWeek getDayOfWeek(LocalDate localDate) {
DayOfWeek day = localDate.getDayOfWeek();
return day;
}
LocalDate getFirstDayOfMonth() {
LocalDate firstDayOfMonth = LocalDate.now().with(TemporalAdjusters.firstDayOfMonth());
return firstDayOfMonth;
}
LocalDateTime getStartOfDay(LocalDate localDate) {
LocalDateTime startofDay = localDate.atStartOfDay();
return startofDay;
}
}
core-java-8/src/main/java/com/baeldung/datetime/UseLocalDateTime.java
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package com.baeldung.datetime;
import java.time.LocalDateTime;
public class UseLocalDateTime {
public LocalDateTime getLocalDateTimeUsingParseMethod(String representation) {
return LocalDateTime.parse(representation);
}
}
core-java-8/src/main/java/com/baeldung/datetime/UseLocalTime.java
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package com.baeldung.datetime;
import java.time.LocalTime;
import java.time.temporal.ChronoUnit;
public class UseLocalTime {
LocalTime getLocalTimeUsingFactoryOfMethod(int hour, int min, int seconds) {
return LocalTime.of(hour, min, seconds);
}
LocalTime getLocalTimeUsingParseMethod(String timeRepresentation) {
return LocalTime.parse(timeRepresentation);
}
private LocalTime getLocalTimeFromClock() {
return LocalTime.now();
}
LocalTime addAnHour(LocalTime localTime) {
return localTime.plus(1, ChronoUnit.HOURS);
}
int getHourFromLocalTime(LocalTime localTime) {
return localTime.getHour();
}
LocalTime getLocalTimeWithMinuteSetToValue(LocalTime localTime, int minute) {
return localTime.withMinute(minute);
}
}
core-java-8/src/main/java/com/baeldung/datetime/UsePeriod.java
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package com.baeldung.datetime;
import java.time.LocalDate;
import java.time.Period;
class UsePeriod {
LocalDate modifyDates(LocalDate localDate, Period period) {
return localDate.plus(period);
}
Period getDifferenceBetweenDates(LocalDate localDate1, LocalDate localDate2) {
return Period.between(localDate1, localDate2);
}
}
core-java-8/src/main/java/com/baeldung/datetime/UseToInstant.java
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package com.baeldung.datetime;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Calendar;
import java.util.Date;
public class UseToInstant {
public LocalDateTime convertDateToLocalDate(Date date) {
return LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());
}
public LocalDateTime convertDateToLocalDate(Calendar calendar) {
return LocalDateTime.ofInstant(calendar.toInstant(), ZoneId.systemDefault());
}
}
core-java-8/src/main/java/com/baeldung/datetime/UseZonedDateTime.java
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package com.baeldung.datetime;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
class UseZonedDateTime {
ZonedDateTime getZonedDateTime(LocalDateTime localDateTime, ZoneId zoneId) {
return ZonedDateTime.of(localDateTime, zoneId);
}
}
core-java-8/src/main/java/com/baeldung/doublecolon/Computer.java
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package com.baeldung.doublecolon;
public class Computer {
private Integer age;
private String color;
private Integer healty;
Computer(final int age, final String color) {
this.age = age;
this.color = color;
}
Computer(final Integer age, final String color, final Integer healty) {
this.age = age;
this.color = color;
this.healty = healty;
}
public Computer() {
}
public Integer getAge() {
return age;
}
public void setAge(final Integer age) {
this.age = age;
}
String getColor() {
return color;
}
public void setColor(final String color) {
this.color = color;
}
Integer getHealty() {
return healty;
}
void setHealty(final Integer healty) {
this.healty = healty;
}
public void turnOnPc() {
System.out.println("Computer turned on");
}
public void turnOffPc() {
System.out.println("Computer turned off");
}
public Double calculateValue(Double initialValue) {
return initialValue / 1.50;
}
@Override
public String toString() {
return "Computer{" + "age=" + age + ", color='" + color + '\'' + ", healty=" + healty + '}';
}
@Override
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final Computer computer = (Computer) o;
return (age != null ? age.equals(computer.age) : computer.age == null) && (color != null ? color.equals(computer.color) : computer.color == null);
}
@Override
public int hashCode() {
int result = age != null ? age.hashCode() : 0;
result = 31 * result + (color != null ? color.hashCode() : 0);
return result;
}
}
core-java-8/src/main/java/com/baeldung/doublecolon/ComputerUtils.java
+27
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package com.baeldung.doublecolon;
import com.baeldung.doublecolon.function.ComputerPredicate;
import java.util.ArrayList;
import java.util.List;
public class ComputerUtils {
static final ComputerPredicate after2010Predicate = (c) -> (c.getAge() > 2010);
static final ComputerPredicate blackPredicate = (c) -> "black".equals(c.getColor());
public static List<Computer> filter(final List<Computer> inventory, final ComputerPredicate p) {
final List<Computer> result = new ArrayList<>();
inventory.stream().filter(p::filter).forEach(result::add);
return result;
}
static void repair(final Computer computer) {
if (computer.getHealty() < 50) {
computer.setHealty(100);
}
}
}
core-java-8/src/main/java/com/baeldung/doublecolon/MacbookPro.java
+39
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package com.baeldung.doublecolon;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.function.Function;
public class MacbookPro extends Computer {
private static final Logger LOG = LoggerFactory.getLogger(MacbookPro.class);
public MacbookPro(int age, String color) {
super(age, color);
}
MacbookPro(Integer age, String color, Integer healty) {
super(age, color, healty);
}
@Override
public void turnOnPc() {
LOG.debug("MacbookPro turned on");
}
@Override
public void turnOffPc() {
LOG.debug("MacbookPro turned off");
}
@Override
public Double calculateValue(Double initialValue) {
Function<Double, Double> function = super::calculateValue;
final Double pcValue = function.apply(initialValue);
LOG.debug("First value is:" + pcValue);
return pcValue + (initialValue / 10);
}
}
core-java-8/src/main/java/com/baeldung/doublecolon/function/ComputerPredicate.java
+10
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package com.baeldung.doublecolon.function;
import com.baeldung.doublecolon.Computer;
@FunctionalInterface
public interface ComputerPredicate {
boolean filter(Computer c);
}
core-java-8/src/main/java/com/baeldung/doublecolon/function/TriFunction.java
+15
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@@ -0,0 +1,15 @@
package com.baeldung.doublecolon.function;
import java.util.Objects;
import java.util.function.Function;
@FunctionalInterface
public interface TriFunction<A, B, C, R> {
R apply(A a, B b, C c);
default <V> TriFunction<A, B, C, V> andThen(final Function<? super R, ? extends V> after) {
Objects.requireNonNull(after);
return (final A a, final B b, final C c) -> after.apply(apply(a, b, c));
}
}
core-java-8/src/main/java/com/baeldung/java8/lambda/exceptions/LambdaExceptionWrappers.java
+57
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@@ -0,0 +1,57 @@
package com.baeldung.java8.lambda.exceptions;
import java.util.function.Consumer;
public class LambdaExceptionWrappers {
public static Consumer<Integer> lambdaWrapper(Consumer<Integer> consumer) {
return i -> {
try {
consumer.accept(i);
} catch (ArithmeticException e) {
System.err.println("Arithmetic Exception occured : " + e.getMessage());
}
};
}
static <T, E extends Exception> Consumer<T> consumerWrapper(Consumer<T> consumer, Class<E> clazz) {
return i -> {
try {
consumer.accept(i);
} catch (Exception ex) {
try {
E exCast = clazz.cast(ex);
System.err.println("Exception occured : " + exCast.getMessage());
} catch (ClassCastException ccEx) {
throw ex;
}
}
};
}
public static <T> Consumer<T> throwingConsumerWrapper(ThrowingConsumer<T, Exception> throwingConsumer) {
return i -> {
try {
throwingConsumer.accept(i);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
};
}
public static <T, E extends Exception> Consumer<T> handlingConsumerWrapper(ThrowingConsumer<T, E> throwingConsumer, Class<E> exceptionClass) {
return i -> {
try {
throwingConsumer.accept(i);
} catch (Exception ex) {
try {
E exCast = exceptionClass.cast(ex);
System.err.println("Exception occured : " + exCast.getMessage());
} catch (ClassCastException ccEx) {
throw new RuntimeException(ex);
}
}
};
}
}
core-java-8/src/main/java/com/baeldung/java8/lambda/exceptions/ThrowingConsumer.java
+8
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@@ -0,0 +1,8 @@
package com.baeldung.java8.lambda.exceptions;
@FunctionalInterface
public interface ThrowingConsumer<T, E extends Exception> {
void accept(T t) throws E;
}
core-java-8/src/main/java/com/baeldung/java_8_features/Address.java
+14
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@@ -0,0 +1,14 @@
package com.baeldung.java_8_features;
public class Address {
private String street;
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
}
core-java-8/src/main/java/com/baeldung/java_8_features/CustomException.java
+4
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@@ -0,0 +1,4 @@
package com.baeldung.java_8_features;
public class CustomException extends RuntimeException {
}
core-java-8/src/main/java/com/baeldung/java_8_features/Detail.java
+13
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@@ -0,0 +1,13 @@
package com.baeldung.java_8_features;
import java.util.Arrays;
import java.util.List;
public class Detail {
private static final List<String> PARTS = Arrays.asList("turbine", "pump");
public List<String> getParts() {
return PARTS;
}
}
core-java-8/src/main/java/com/baeldung/java_8_features/OptionalAddress.java
+16
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@@ -0,0 +1,16 @@
package com.baeldung.java_8_features;
import java.util.Optional;
public class OptionalAddress {
private String street;
public Optional<String> getStreet() {
return Optional.ofNullable(street);
}
public void setStreet(String street) {
this.street = street;
}
}
core-java-8/src/main/java/com/baeldung/java_8_features/OptionalUser.java
+16
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@@ -0,0 +1,16 @@
package com.baeldung.java_8_features;
import java.util.Optional;
public class OptionalUser {
private OptionalAddress address;
public Optional<OptionalAddress> getAddress() {
return Optional.of(address);
}
public void setAddress(OptionalAddress address) {
this.address = address;
}
}
core-java-8/src/main/java/com/baeldung/java_8_features/Person.java
+27
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@@ -0,0 +1,27 @@
package com.baeldung.java_8_features;
public class Person {
private String name;
private Integer age;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
core-java-8/src/main/java/com/baeldung/java_8_features/User.java
+40
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@@ -0,0 +1,40 @@
package com.baeldung.java_8_features;
import java.util.Optional;
public class User {
private String name;
private Address address;
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
public User() {
}
public User(String name) {
this.name = name;
}
public static boolean isRealUser(User user) {
return true;
}
public String getOrThrow() {
String value = null;
Optional<String> valueOpt = Optional.ofNullable(value);
String result = valueOpt.orElseThrow(CustomException::new).toUpperCase();
return result;
}
public boolean isLegalName(String name) {
return name.length() > 3 && name.length() < 16;
}
}
core-java-8/src/main/java/com/baeldung/java_8_features/Vehicle.java
+18
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package com.baeldung.java_8_features;
public interface Vehicle {
void moveTo(long altitude, long longitude);
static String producer() {
return "N&F Vehicles";
}
default long[] startPosition() {
return new long[] { 23, 15 };
}
default String getOverview() {
return "ATV made by " + producer();
}
}
core-java-8/src/main/java/com/baeldung/java_8_features/VehicleImpl.java
+9
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@@ -0,0 +1,9 @@
package com.baeldung.java_8_features;
public class VehicleImpl implements Vehicle {
@Override
public void moveTo(long altitude, long longitude) {
// do nothing
}
}
core-java-8/src/main/java/com/baeldung/java_8_features/groupingby/BlogPost.java
+36
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package com.baeldung.java_8_features.groupingby;
public class BlogPost {
private String title;
private String author;
private BlogPostType type;
private int likes;
public BlogPost(String title, String author, BlogPostType type, int likes) {
this.title = title;
this.author = author;
this.type = type;
this.likes = likes;
}
public String getTitle() {
return title;
}
public String getAuthor() {
return author;
}
public BlogPostType getType() {
return type;
}
public int getLikes() {
return likes;
}
@Override
public String toString() {
return "BlogPost{" + "title='" + title + '\'' + ", type=" + type + ", likes=" + likes + '}';
}
}
core-java-8/src/main/java/com/baeldung/java_8_features/groupingby/BlogPostType.java
+5
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package com.baeldung.java_8_features.groupingby;
public enum BlogPostType {
NEWS, REVIEW, GUIDE
}
core-java-8/src/main/java/com/baeldung/optional/Modem.java
+13
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package com.baeldung.optional;
public class Modem {
private Double price;
public Modem(Double price) {
this.price = price;
}
public Double getPrice() {
return price;
}
}
core-java-8/src/main/java/com/baeldung/optional/Person.java
+39
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package com.baeldung.optional;
import java.util.Optional;
public class Person {
private String name;
private int age;
private String password;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
public Optional<String> getName() {
return Optional.ofNullable(name);
}
public void setName(String name) {
this.name = name;
}
public Optional<Integer> getAge() {
return Optional.ofNullable(age);
}
public void setAge(int age) {
this.age = age;
}
public void setPassword(String password) {
this.password = password;
}
public Optional<String> getPassword() {
return Optional.ofNullable(password);
}
}
core-java-8/src/main/java/com/baeldung/strategy/ChristmasDiscounter.java
+11
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package com.baeldung.strategy;
import java.math.BigDecimal;
public class ChristmasDiscounter implements Discounter {
@Override
public BigDecimal apply(BigDecimal amount) {
return amount.multiply(BigDecimal.valueOf(0.9));
}
}
core-java-8/src/main/java/com/baeldung/strategy/Discounter.java
+23
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@@ -0,0 +1,23 @@
package com.baeldung.strategy;
import java.math.BigDecimal;
import java.util.function.UnaryOperator;
public interface Discounter extends UnaryOperator<BigDecimal> {
default Discounter combine(Discounter after) {
return value -> after.apply(this.apply(value));
}
static Discounter christmas() {
return (amount) -> amount.multiply(BigDecimal.valueOf(0.9));
}
static Discounter newYear() {
return (amount) -> amount.multiply(BigDecimal.valueOf(0.8));
}
static Discounter easter() {
return (amount) -> amount.multiply(BigDecimal.valueOf(0.5));
}
}
core-java-8/src/main/java/com/baeldung/strategy/EasterDiscounter.java
+11
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@@ -0,0 +1,11 @@
package com.baeldung.strategy;
import java.math.BigDecimal;
public class EasterDiscounter implements Discounter {
@Override
public BigDecimal apply(BigDecimal amount) {
return amount.multiply(BigDecimal.valueOf(0.5));
}
}
core-java-8/src/main/java/com/baeldung/stream/InfiniteStreams.java
+32
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@@ -0,0 +1,32 @@
package com.baeldung.stream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.stream.Stream;
public class InfiniteStreams {
private static final Logger LOG = LoggerFactory.getLogger(InfiniteStreams.class);
public static void main(String[] args) {
doWhileOldWay();
doWhileStreamWay();
}
private static void doWhileOldWay() {
int i = 0;
while (i < 10) {
LOG.debug("{}", i);
i++;
}
}
private static void doWhileStreamWay() {
Stream<Integer> integers = Stream.iterate(0, i -> i + 1);
integers.limit(10).forEach(System.out::println);
}
}
core-java-8/src/main/java/com/baeldung/stream/StreamApi.java
+24
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package com.baeldung.stream;
import java.util.List;
import java.util.stream.Stream;
public class StreamApi {
public static String getLastElementUsingReduce(List<String> valueList) {
Stream<String> stream = valueList.stream();
return stream.reduce((first, second) -> second).orElse(null);
}
public static Integer getInfiniteStreamLastElementUsingReduce() {
Stream<Integer> stream = Stream.iterate(0, i -> i + 1);
return stream.limit(20).reduce((first, second) -> second).orElse(null);
}
public static String getLastElementUsingSkip(List<String> valueList) {
long count = valueList.stream().count();
Stream<String> stream = valueList.stream();
return stream.skip(count - 1).findFirst().orElse(null);
}
}
core-java-8/src/main/java/com/baeldung/streamApi/Product.java
+50
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@@ -0,0 +1,50 @@
package com.baeldung.streamApi;
import java.util.List;
import java.util.Optional;
import java.util.stream.IntStream;
import java.util.stream.Stream;
/**
* Created by Alex Vengr
*/
public class Product {
private int price;
private String name;
private boolean utilize;
public Product(int price, String name) {
this(price);
this.name = name;
}
public Product(int price) {
this.price = price;
}
public Product() {
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public static Stream<String> streamOf(List<String> list) {
return (list == null || list.isEmpty()) ? Stream.empty() : list.stream();
}
}
core-java-8/src/main/java/com/baeldung/string/JoinerSplitter.java
+36
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@@ -0,0 +1,36 @@
package com.baeldung.string;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class JoinerSplitter {
public static String join ( String[] arrayOfString ) {
return Arrays.asList(arrayOfString)
.stream()
.map(x -> x)
.collect(Collectors.joining(","));
}
public static String joinWithPrefixPostFix ( String[] arrayOfString ) {
return Arrays.asList(arrayOfString)
.stream()
.map(x -> x)
.collect(Collectors.joining(",","[","]"));
}
public static List<String> split ( String str ) {
return Stream.of(str.split(","))
.map (elem -> new String(elem))
.collect(Collectors.toList());
}
public static List<Character> splitToListOfChar ( String str ) {
return str.chars()
.mapToObj(item -> (char) item)
.collect(Collectors.toList());
}
}
core-java-8/src/main/java/com/baeldung/temporaladjuster/CustomTemporalAdjuster.java
+22
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package com.baeldung.temporaladjuster;
import java.time.DayOfWeek;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAdjuster;
public class CustomTemporalAdjuster implements TemporalAdjuster {
@Override
public Temporal adjustInto(Temporal temporal) {
switch (DayOfWeek.of(temporal.get(ChronoField.DAY_OF_WEEK))) {
case FRIDAY:
return temporal.plus(3, ChronoUnit.DAYS);
case SATURDAY:
return temporal.plus(2, ChronoUnit.DAYS);
default:
return temporal.plus(1, ChronoUnit.DAYS);
}
}
}
core-java-8/src/main/resources/ESAPI.properties
+453
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#
# OWASP Enterprise Security API (ESAPI) Properties file -- PRODUCTION Version
#
# This file is part of the Open Web Application Security Project (OWASP)
# Enterprise Security API (ESAPI) project. For details, please see
# http://www.owasp.org/index.php/ESAPI.
#
# Copyright (c) 2008,2009 - The OWASP Foundation
#
# DISCUSS: This may cause a major backwards compatibility issue, etc. but
# from a name space perspective, we probably should have prefaced
# all the property names with ESAPI or at least OWASP. Otherwise
# there could be problems is someone loads this properties file into
# the System properties. We could also put this file into the
# esapi.jar file (perhaps as a ResourceBundle) and then allow an external
# ESAPI properties be defined that would overwrite these defaults.
# That keeps the application's properties relatively simple as usually
# they will only want to override a few properties. If looks like we
# already support multiple override levels of this in the
# DefaultSecurityConfiguration class, but I'm suggesting placing the
# defaults in the esapi.jar itself. That way, if the jar is signed,
# we could detect if those properties had been tampered with. (The
# code to check the jar signatures is pretty simple... maybe 70-90 LOC,
# but off course there is an execution penalty (similar to the way
# that the separate sunjce.jar used to be when a class from it was
# first loaded). Thoughts?
###############################################################################
#
# WARNING: Operating system protection should be used to lock down the .esapi
# resources directory and all the files inside and all the directories all the
# way up to the root directory of the file system. Note that if you are using
# file-based implementations, that some files may need to be read-write as they
# get updated dynamically.
#
# Before using, be sure to update the MasterKey and MasterSalt as described below.
# N.B.: If you had stored data that you have previously encrypted with ESAPI 1.4,
# you *must* FIRST decrypt it using ESAPI 1.4 and then (if so desired)
# re-encrypt it with ESAPI 2.0. If you fail to do this, you will NOT be
# able to decrypt your data with ESAPI 2.0.
#
# YOU HAVE BEEN WARNED!!! More details are in the ESAPI 2.0 Release Notes.
#
#===========================================================================
# ESAPI Configuration
#
# If true, then print all the ESAPI properties set here when they are loaded.
# If false, they are not printed. Useful to reduce output when running JUnit tests.
# If you need to troubleshoot a properties related problem, turning this on may help.
# This is 'false' in the src/test/resources/.esapi version. It is 'true' by
# default for reasons of backward compatibility with earlier ESAPI versions.
ESAPI.printProperties=true
# ESAPI is designed to be easily extensible. You can use the reference implementation
# or implement your own providers to take advantage of your enterprise's security
# infrastructure. The functions in ESAPI are referenced using the ESAPI locator, like:
#
# String ciphertext =
# ESAPI.encryptor().encrypt("Secret message"); // Deprecated in 2.0
# CipherText cipherText =
# ESAPI.encryptor().encrypt(new PlainText("Secret message")); // Preferred
#
# Below you can specify the classname for the provider that you wish to use in your
# application. The only requirement is that it implement the appropriate ESAPI interface.
# This allows you to switch security implementations in the future without rewriting the
# entire application.
#
# ExperimentalAccessController requires ESAPI-AccessControlPolicy.xml in .esapi directory
ESAPI.AccessControl=org.owasp.esapi.reference.DefaultAccessController
# FileBasedAuthenticator requires users.txt file in .esapi directory
ESAPI.Authenticator=org.owasp.esapi.reference.FileBasedAuthenticator
ESAPI.Encoder=org.owasp.esapi.reference.DefaultEncoder
ESAPI.Encryptor=org.owasp.esapi.reference.crypto.JavaEncryptor
ESAPI.Executor=org.owasp.esapi.reference.DefaultExecutor
ESAPI.HTTPUtilities=org.owasp.esapi.reference.DefaultHTTPUtilities
ESAPI.IntrusionDetector=org.owasp.esapi.reference.DefaultIntrusionDetector
# Log4JFactory Requires log4j.xml or log4j.properties in classpath - http://www.laliluna.de/log4j-tutorial.html
ESAPI.Logger=org.owasp.esapi.reference.Log4JLogFactory
#ESAPI.Logger=org.owasp.esapi.reference.JavaLogFactory
ESAPI.Randomizer=org.owasp.esapi.reference.DefaultRandomizer
ESAPI.Validator=org.owasp.esapi.reference.DefaultValidator
#===========================================================================
# ESAPI Authenticator
#
Authenticator.AllowedLoginAttempts=3
Authenticator.MaxOldPasswordHashes=13
Authenticator.UsernameParameterName=username
Authenticator.PasswordParameterName=password
# RememberTokenDuration (in days)
Authenticator.RememberTokenDuration=14
# Session Timeouts (in minutes)
Authenticator.IdleTimeoutDuration=20
Authenticator.AbsoluteTimeoutDuration=120
#===========================================================================
# ESAPI Encoder
#
# ESAPI canonicalizes input before validation to prevent bypassing filters with encoded attacks.
# Failure to canonicalize input is a very common mistake when implementing validation schemes.
# Canonicalization is automatic when using the ESAPI Validator, but you can also use the
# following code to canonicalize data.
#
# ESAPI.Encoder().canonicalize( "%22hello world&#x22;" );
#
# Multiple encoding is when a single encoding format is applied multiple times. Allowing
# multiple encoding is strongly discouraged.
Encoder.AllowMultipleEncoding=false
# Mixed encoding is when multiple different encoding formats are applied, or when
# multiple formats are nested. Allowing multiple encoding is strongly discouraged.
Encoder.AllowMixedEncoding=false
# The default list of codecs to apply when canonicalizing untrusted data. The list should include the codecs
# for all downstream interpreters or decoders. For example, if the data is likely to end up in a URL, HTML, or
# inside JavaScript, then the list of codecs below is appropriate. The order of the list is not terribly important.
Encoder.DefaultCodecList=HTMLEntityCodec,PercentCodec,JavaScriptCodec
#===========================================================================
# ESAPI Encryption
#
# The ESAPI Encryptor provides basic cryptographic functions with a simplified API.
# To get started, generate a new key using java -classpath esapi.jar org.owasp.esapi.reference.crypto.JavaEncryptor
# There is not currently any support for key rotation, so be careful when changing your key and salt as it
# will invalidate all signed, encrypted, and hashed data.
#
# WARNING: Not all combinations of algorithms and key lengths are supported.
# If you choose to use a key length greater than 128, you MUST download the
# unlimited strength policy files and install in the lib directory of your JRE/JDK.
# See http://java.sun.com/javase/downloads/index.jsp for more information.
#
# Backward compatibility with ESAPI Java 1.4 is supported by the two deprecated API
# methods, Encryptor.encrypt(String) and Encryptor.decrypt(String). However, whenever
# possible, these methods should be avoided as they use ECB cipher mode, which in almost
# all circumstances a poor choice because of it's weakness. CBC cipher mode is the default
# for the new Encryptor encrypt / decrypt methods for ESAPI Java 2.0. In general, you
# should only use this compatibility setting if you have persistent data encrypted with
# version 1.4 and even then, you should ONLY set this compatibility mode UNTIL
# you have decrypted all of your old encrypted data and then re-encrypted it with
# ESAPI 2.0 using CBC mode. If you have some reason to mix the deprecated 1.4 mode
# with the new 2.0 methods, make sure that you use the same cipher algorithm for both
# (256-bit AES was the default for 1.4; 128-bit is the default for 2.0; see below for
# more details.) Otherwise, you will have to use the new 2.0 encrypt / decrypt methods
# where you can specify a SecretKey. (Note that if you are using the 256-bit AES,
# that requires downloading the special jurisdiction policy files mentioned above.)
#
# ***** IMPORTANT: Do NOT forget to replace these with your own values! *****
# To calculate these values, you can run:
# java -classpath esapi.jar org.owasp.esapi.reference.crypto.JavaEncryptor
#
Encryptor.MasterKey=tzfztf56ftv
Encryptor.MasterSalt=123456ztrewq
# Provides the default JCE provider that ESAPI will "prefer" for its symmetric
# encryption and hashing. (That is it will look to this provider first, but it
# will defer to other providers if the requested algorithm is not implemented
# by this provider.) If left unset, ESAPI will just use your Java VM's current
# preferred JCE provider, which is generally set in the file
# "$JAVA_HOME/jre/lib/security/java.security".
#
# The main intent of this is to allow ESAPI symmetric encryption to be
# used with a FIPS 140-2 compliant crypto-module. For details, see the section
# "Using ESAPI Symmetric Encryption with FIPS 140-2 Cryptographic Modules" in
# the ESAPI 2.0 Symmetric Encryption User Guide, at:
# http://owasp-esapi-java.googlecode.com/svn/trunk/documentation/esapi4java-core-2.0-symmetric-crypto-user-guide.html
# However, this property also allows you to easily use an alternate JCE provider
# such as "Bouncy Castle" without having to make changes to "java.security".
# See Javadoc for SecurityProviderLoader for further details. If you wish to use
# a provider that is not known to SecurityProviderLoader, you may specify the
# fully-qualified class name of the JCE provider class that implements
# java.security.Provider. If the name contains a '.', this is interpreted as
# a fully-qualified class name that implements java.security.Provider.
#
# NOTE: Setting this property has the side-effect of changing it in your application
# as well, so if you are using JCE in your application directly rather than
# through ESAPI (you wouldn't do that, would you? ;-), it will change the
# preferred JCE provider there as well.
#
# Default: Keeps the JCE provider set to whatever JVM sets it to.
Encryptor.PreferredJCEProvider=
# AES is the most widely used and strongest encryption algorithm. This
# should agree with your Encryptor.CipherTransformation property.
# By default, ESAPI Java 1.4 uses "PBEWithMD5AndDES" and which is
# very weak. It is essentially a password-based encryption key, hashed
# with MD5 around 1K times and then encrypted with the weak DES algorithm
# (56-bits) using ECB mode and an unspecified padding (it is
# JCE provider specific, but most likely "NoPadding"). However, 2.0 uses
# "AES/CBC/PKCSPadding". If you want to change these, change them here.
# Warning: This property does not control the default reference implementation for
# ESAPI 2.0 using JavaEncryptor. Also, this property will be dropped
# in the future.
# @deprecated
Encryptor.EncryptionAlgorithm=AES
# For ESAPI Java 2.0 - New encrypt / decrypt methods use this.
Encryptor.CipherTransformation=AES/CBC/PKCS5Padding
# Applies to ESAPI 2.0 and later only!
# Comma-separated list of cipher modes that provide *BOTH*
# confidentiality *AND* message authenticity. (NIST refers to such cipher
# modes as "combined modes" so that's what we shall call them.) If any of these
# cipher modes are used then no MAC is calculated and stored
# in the CipherText upon encryption. Likewise, if one of these
# cipher modes is used with decryption, no attempt will be made
# to validate the MAC contained in the CipherText object regardless
# of whether it contains one or not. Since the expectation is that
# these cipher modes support support message authenticity already,
# injecting a MAC in the CipherText object would be at best redundant.
#
# Note that as of JDK 1.5, the SunJCE provider does not support *any*
# of these cipher modes. Of these listed, only GCM and CCM are currently
# NIST approved. YMMV for other JCE providers. E.g., Bouncy Castle supports
# GCM and CCM with "NoPadding" mode, but not with "PKCS5Padding" or other
# padding modes.
Encryptor.cipher_modes.combined_modes=GCM,CCM,IAPM,EAX,OCB,CWC
# Applies to ESAPI 2.0 and later only!
# Additional cipher modes allowed for ESAPI 2.0 encryption. These
# cipher modes are in _addition_ to those specified by the property
# 'Encryptor.cipher_modes.combined_modes'.
# Note: We will add support for streaming modes like CFB & OFB once
# we add support for 'specified' to the property 'Encryptor.ChooseIVMethod'
# (probably in ESAPI 2.1).
# DISCUSS: Better name?
Encryptor.cipher_modes.additional_allowed=CBC
# 128-bit is almost always sufficient and appears to be more resistant to
# related key attacks than is 256-bit AES. Use '_' to use default key size
# for cipher algorithms (where it makes sense because the algorithm supports
# a variable key size). Key length must agree to what's provided as the
# cipher transformation, otherwise this will be ignored after logging a
# warning.
#
# NOTE: This is what applies BOTH ESAPI 1.4 and 2.0. See warning above about mixing!
Encryptor.EncryptionKeyLength=128
# Because 2.0 uses CBC mode by default, it requires an initialization vector (IV).
# (All cipher modes except ECB require an IV.) There are two choices: we can either
# use a fixed IV known to both parties or allow ESAPI to choose a random IV. While
# the IV does not need to be hidden from adversaries, it is important that the
# adversary not be allowed to choose it. Also, random IVs are generally much more
# secure than fixed IVs. (In fact, it is essential that feed-back cipher modes
# such as CFB and OFB use a different IV for each encryption with a given key so
# in such cases, random IVs are much preferred. By default, ESAPI 2.0 uses random
# IVs. If you wish to use 'fixed' IVs, set 'Encryptor.ChooseIVMethod=fixed' and
# uncomment the Encryptor.fixedIV.
#
# Valid values: random|fixed|specified 'specified' not yet implemented; planned for 2.1
Encryptor.ChooseIVMethod=random
# If you choose to use a fixed IV, then you must place a fixed IV here that
# is known to all others who are sharing your secret key. The format should
# be a hex string that is the same length as the cipher block size for the
# cipher algorithm that you are using. The following is an *example* for AES
# from an AES test vector for AES-128/CBC as described in:
# NIST Special Publication 800-38A (2001 Edition)
# "Recommendation for Block Cipher Modes of Operation".
# (Note that the block size for AES is 16 bytes == 128 bits.)
#
Encryptor.fixedIV=0x000102030405060708090a0b0c0d0e0f
# Whether or not CipherText should use a message authentication code (MAC) with it.
# This prevents an adversary from altering the IV as well as allowing a more
# fool-proof way of determining the decryption failed because of an incorrect
# key being supplied. This refers to the "separate" MAC calculated and stored
# in CipherText, not part of any MAC that is calculated as a result of a
# "combined mode" cipher mode.
#
# If you are using ESAPI with a FIPS 140-2 cryptographic module, you *must* also
# set this property to false.
Encryptor.CipherText.useMAC=true
# Whether or not the PlainText object may be overwritten and then marked
# eligible for garbage collection. If not set, this is still treated as 'true'.
Encryptor.PlainText.overwrite=true
# Do not use DES except in a legacy situations. 56-bit is way too small key size.
#Encryptor.EncryptionKeyLength=56
#Encryptor.EncryptionAlgorithm=DES
# TripleDES is considered strong enough for most purposes.
# Note: There is also a 112-bit version of DESede. Using the 168-bit version
# requires downloading the special jurisdiction policy from Sun.
#Encryptor.EncryptionKeyLength=168
#Encryptor.EncryptionAlgorithm=DESede
Encryptor.HashAlgorithm=SHA-512
Encryptor.HashIterations=1024
Encryptor.DigitalSignatureAlgorithm=SHA1withDSA
Encryptor.DigitalSignatureKeyLength=1024
Encryptor.RandomAlgorithm=SHA1PRNG
Encryptor.CharacterEncoding=UTF-8
# This is the Pseudo Random Function (PRF) that ESAPI's Key Derivation Function
# (KDF) normally uses. Note this is *only* the PRF used for ESAPI's KDF and
# *not* what is used for ESAPI's MAC. (Currently, HmacSHA1 is always used for
# the MAC, mostly to keep the overall size at a minimum.)
#
# Currently supported choices for JDK 1.5 and 1.6 are:
# HmacSHA1 (160 bits), HmacSHA256 (256 bits), HmacSHA384 (384 bits), and
# HmacSHA512 (512 bits).
# Note that HmacMD5 is *not* supported for the PRF used by the KDF even though
# the JDKs support it. See the ESAPI 2.0 Symmetric Encryption User Guide
# further details.
Encryptor.KDF.PRF=HmacSHA256
#===========================================================================
# ESAPI HttpUtilties
#
# The HttpUtilities provide basic protections to HTTP requests and responses. Primarily these methods
# protect against malicious data from attackers, such as unprintable characters, escaped characters,
# and other simple attacks. The HttpUtilities also provides utility methods for dealing with cookies,
# headers, and CSRF tokens.
#
# Default file upload location (remember to escape backslashes with \\)
HttpUtilities.UploadDir=C:\\ESAPI\\testUpload
HttpUtilities.UploadTempDir=C:\\temp
# Force flags on cookies, if you use HttpUtilities to set cookies
HttpUtilities.ForceHttpOnlySession=false
HttpUtilities.ForceSecureSession=false
HttpUtilities.ForceHttpOnlyCookies=true
HttpUtilities.ForceSecureCookies=true
# Maximum size of HTTP headers
HttpUtilities.MaxHeaderSize=4096
# File upload configuration
HttpUtilities.ApprovedUploadExtensions=.zip,.pdf,.doc,.docx,.ppt,.pptx,.tar,.gz,.tgz,.rar,.war,.jar,.ear,.xls,.rtf,.properties,.java,.class,.txt,.xml,.jsp,.jsf,.exe,.dll
HttpUtilities.MaxUploadFileBytes=500000000
# Using UTF-8 throughout your stack is highly recommended. That includes your database driver,
# container, and any other technologies you may be using. Failure to do this may expose you
# to Unicode transcoding injection attacks. Use of UTF-8 does not hinder internationalization.
HttpUtilities.ResponseContentType=text/html; charset=UTF-8
# This is the name of the cookie used to represent the HTTP session
# Typically this will be the default "JSESSIONID"
HttpUtilities.HttpSessionIdName=JSESSIONID
#===========================================================================
# ESAPI Executor
# CHECKME - Not sure what this is used for, but surely it should be made OS independent.
Executor.WorkingDirectory=C:\\Windows\\Temp
Executor.ApprovedExecutables=C:\\Windows\\System32\\cmd.exe,C:\\Windows\\System32\\runas.exe
#===========================================================================
# ESAPI Logging
# Set the application name if these logs are combined with other applications
Logger.ApplicationName=ExampleApplication
# If you use an HTML log viewer that does not properly HTML escape log data, you can set LogEncodingRequired to true
Logger.LogEncodingRequired=false
# Determines whether ESAPI should log the application name. This might be clutter in some single-server/single-app environments.
Logger.LogApplicationName=true
# Determines whether ESAPI should log the server IP and port. This might be clutter in some single-server environments.
Logger.LogServerIP=true
# LogFileName, the name of the logging file. Provide a full directory path (e.g., C:\\ESAPI\\ESAPI_logging_file) if you
# want to place it in a specific directory.
Logger.LogFileName=ESAPI_logging_file
# MaxLogFileSize, the max size (in bytes) of a single log file before it cuts over to a new one (default is 10,000,000)
Logger.MaxLogFileSize=10000000
#===========================================================================
# ESAPI Intrusion Detection
#
# Each event has a base to which .count, .interval, and .action are added
# The IntrusionException will fire if we receive "count" events within "interval" seconds
# The IntrusionDetector is configurable to take the following actions: log, logout, and disable
# (multiple actions separated by commas are allowed e.g. event.test.actions=log,disable
#
# Custom Events
# Names must start with "event." as the base
# Use IntrusionDetector.addEvent( "test" ) in your code to trigger "event.test" here
# You can also disable intrusion detection completely by changing
# the following parameter to true
#
IntrusionDetector.Disable=false
#
IntrusionDetector.event.test.count=2
IntrusionDetector.event.test.interval=10
IntrusionDetector.event.test.actions=disable,log
# Exception Events
# All EnterpriseSecurityExceptions are registered automatically
# Call IntrusionDetector.getInstance().addException(e) for Exceptions that do not extend EnterpriseSecurityException
# Use the fully qualified classname of the exception as the base
# any intrusion is an attack
IntrusionDetector.org.owasp.esapi.errors.IntrusionException.count=1
IntrusionDetector.org.owasp.esapi.errors.IntrusionException.interval=1
IntrusionDetector.org.owasp.esapi.errors.IntrusionException.actions=log,disable,logout
# for test purposes
# CHECKME: Shouldn't there be something in the property name itself that designates
# that these are for testing???
IntrusionDetector.org.owasp.esapi.errors.IntegrityException.count=10
IntrusionDetector.org.owasp.esapi.errors.IntegrityException.interval=5
IntrusionDetector.org.owasp.esapi.errors.IntegrityException.actions=log,disable,logout
# rapid validation errors indicate scans or attacks in progress
# org.owasp.esapi.errors.ValidationException.count=10
# org.owasp.esapi.errors.ValidationException.interval=10
# org.owasp.esapi.errors.ValidationException.actions=log,logout
# sessions jumping between hosts indicates session hijacking
IntrusionDetector.org.owasp.esapi.errors.AuthenticationHostException.count=2
IntrusionDetector.org.owasp.esapi.errors.AuthenticationHostException.interval=10
IntrusionDetector.org.owasp.esapi.errors.AuthenticationHostException.actions=log,logout
#===========================================================================
# ESAPI Validation
#
# The ESAPI Validator works on regular expressions with defined names. You can define names
# either here, or you may define application specific patterns in a separate file defined below.
# This allows enterprises to specify both organizational standards as well as application specific
# validation rules.
#
Validator.ConfigurationFile=validation.properties
# Validators used by ESAPI
Validator.AccountName=^[a-zA-Z0-9]{3,20}$
Validator.SystemCommand=^[a-zA-Z\\-\\/]{1,64}$
Validator.RoleName=^[a-z]{1,20}$
#the word TEST below should be changed to your application
#name - only relative URL's are supported
Validator.Redirect=^\\/test.*$
# Global HTTP Validation Rules
# Values with Base64 encoded data (e.g. encrypted state) will need at least [a-zA-Z0-9\/+=]
Validator.HTTPScheme=^(http|https)$
Validator.HTTPServerName=^[a-zA-Z0-9_.\\-]*$
Validator.HTTPParameterName=^[a-zA-Z0-9_]{1,32}$
Validator.HTTPParameterValue=^[a-zA-Z0-9.\\-\\/+=@_ ]*$
Validator.HTTPCookieName=^[a-zA-Z0-9\\-_]{1,32}$
Validator.HTTPCookieValue=^[a-zA-Z0-9\\-\\/+=_ ]*$
Validator.HTTPHeaderName=^[a-zA-Z0-9\\-_]{1,32}$
Validator.HTTPHeaderValue=^[a-zA-Z0-9()\\-=\\*\\.\\?;,+\\/:&_ ]*$
Validator.HTTPContextPath=^\\/?[a-zA-Z0-9.\\-\\/_]*$
Validator.HTTPServletPath=^[a-zA-Z0-9.\\-\\/_]*$
Validator.HTTPPath=^[a-zA-Z0-9.\\-_]*$
Validator.HTTPQueryString=^[a-zA-Z0-9()\\-=\\*\\.\\?;,+\\/:&_ %]*$
Validator.HTTPURI=^[a-zA-Z0-9()\\-=\\*\\.\\?;,+\\/:&_ ]*$
Validator.HTTPURL=^.*$
Validator.HTTPJSESSIONID=^[A-Z0-9]{10,30}$
# Validation of file related input
Validator.FileName=^[a-zA-Z0-9!@#$%^&{}\\[\\]()_+\\-=,.~'` ]{1,255}$
Validator.DirectoryName=^[a-zA-Z0-9:/\\\\!@#$%^&{}\\[\\]()_+\\-=,.~'` ]{1,255}$
# Validation of dates. Controls whether or not 'lenient' dates are accepted.
# See DataFormat.setLenient(boolean flag) for further details.
Validator.AcceptLenientDates=false
core-java-8/src/main/resources/META-INF/persistence.xml
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<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd" version="2.1">
<!-- JDO tutorial "unit" -->
<persistence-unit name="Tutorial">
<exclude-unlisted-classes/>
<properties>
<property name="javax.jdo.PersistenceManagerFactoryClass" value="org.datanucleus.api.jdo.JDOPersistenceManagerFactory"/>
<property name="javax.jdo.option.ConnectionURL" value="jdbc:h2:mem:mypersistence"/>
<property name="javax.jdo.option.ConnectionDriverName" value="org.h2.Driver"/>
<property name="javax.jdo.option.ConnectionUserName" value="sa"/>
<property name="javax.jdo.option.ConnectionPassword" value=""/>
<property name="datanucleus.schema.autoCreateAll" value="true"/>
</properties>
</persistence-unit>
</persistence>
core-java-8/src/main/resources/data.csv
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1|IND|India
2|MY|Malaysia
3|AU|Australia
1 1 IND India
2 2 MY Malaysia
3 3 AU Australia
core-java-8/src/main/resources/datasource.properties
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dataSourceClassName=//TBD
dataSource.user=//TBD
dataSource.password=//TBD
dataSource.databaseName=//TBD
dataSource.portNumber=//TBD
dataSource.serverName=//TBD
core-java-8/src/main/resources/dirCompressed.zip
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core-java-8/src/main/resources/js/bind.js
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var first = {
name: "Whiskey",
age: 5
};
var second = {
volume: 100
};
Object.bindProperties(first, second);
print(first.volume);
second.volume = 1000;
print(first.volume);
core-java-8/src/main/resources/js/locations.js
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@@ -0,0 +1 @@
print(__FILE__, __LINE__, __DIR__);
core-java-8/src/main/resources/js/math_module.js
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var math = {
increment: function (num) {
return ++num;
},
failFunc: function () {
try {
throw "BOOM";
} catch (e if typeof e === 'string') {
print("String thrown: " + e);
}
catch (e) {
print("this shouldn't happen!");
}
}
};
math;
core-java-8/src/main/resources/js/no_such.js
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var demo = {
__noSuchProperty__: function (propName) {
print("Accessed non-existing property: " + propName);
},
__noSuchMethod__: function (methodName) {
print("Invoked non-existing method: " + methodName);
}
};
demo;
core-java-8/src/main/resources/js/script.js
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function increment(num) ++num;
core-java-8/src/main/resources/js/trim.js
+2
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@@ -0,0 +1,2 @@
print(" hello world".trimLeft());
print("hello world ".trimRight());
core-java-8/src/main/resources/js/typed_arrays.js
+9
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function arrays(arr) {
var javaIntArray = Java.to(arr, "int[]");
print(javaIntArray[0]);
print(javaIntArray[1]);
print(javaIntArray[2]);
}
arrays([100, "1654", true]);
core-java-8/src/main/resources/log4j.properties
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log4j.rootLogger=DEBUG, A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n
core-java-8/src/main/resources/log4jstructuraldp.properties
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# Root logger
log4j.rootLogger=INFO, file, stdout
# Write to console
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
core-java-8/src/main/resources/logback.xml
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>web - %date [%thread] %-5level %logger{36} - %message%n
</pattern>
</encoder>
</appender>
<logger name="org.springframework" level="WARN" />
<logger name="org.springframework.transaction" level="WARN" />
<!-- in order to debug some marshalling issues, this needs to be TRACE -->
<logger name="org.springframework.web.servlet.mvc" level="WARN" />
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>
core-java-8/src/main/resources/multiCompressed.zip
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core-java-8/src/main/resources/targetFile.tmp
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line 1
a second line
core-java-8/src/test/java/com/baeldung/collectors/Java8CollectorsUnitTest.java
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package com.baeldung.collectors;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import org.junit.Test;
import java.util.Arrays;
import java.util.Comparator;
import java.util.DoubleSummaryStatistics;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.BiConsumer;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collector;
import static com.google.common.collect.Sets.newHashSet;
import static java.util.stream.Collectors.averagingDouble;
import static java.util.stream.Collectors.collectingAndThen;
import static java.util.stream.Collectors.counting;
import static java.util.stream.Collectors.groupingBy;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.maxBy;
import static java.util.stream.Collectors.partitioningBy;
import static java.util.stream.Collectors.summarizingDouble;
import static java.util.stream.Collectors.summingDouble;
import static java.util.stream.Collectors.toCollection;
import static java.util.stream.Collectors.toList;
import static java.util.stream.Collectors.toMap;
import static java.util.stream.Collectors.toSet;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
public class Java8CollectorsUnitTest {
private final List<String> givenList = Arrays.asList("a", "bb", "ccc", "dd");
@Test
public void whenCollectingToList_shouldCollectToList() throws Exception {
final List<String> result = givenList.stream().collect(toList());
assertThat(result).containsAll(givenList);
}
@Test
public void whenCollectingToList_shouldCollectToSet() throws Exception {
final Set<String> result = givenList.stream().collect(toSet());
assertThat(result).containsAll(givenList);
}
@Test
public void whenCollectingToCollection_shouldCollectToCollection() throws Exception {
final List<String> result = givenList.stream().collect(toCollection(LinkedList::new));
assertThat(result).containsAll(givenList).isInstanceOf(LinkedList.class);
}
@Test
public void whenCollectingToImmutableCollection_shouldThrowException() throws Exception {
assertThatThrownBy(() -> {
givenList.stream().collect(toCollection(ImmutableList::of));
}).isInstanceOf(UnsupportedOperationException.class);
}
@Test
public void whenCollectingToMap_shouldCollectToMap() throws Exception {
final Map<String, Integer> result = givenList.stream().collect(toMap(Function.identity(), String::length));
assertThat(result).containsEntry("a", 1).containsEntry("bb", 2).containsEntry("ccc", 3).containsEntry("dd", 2);
}
@Test
public void whenCollectingToMap_shouldCollectToMapMerging() throws Exception {
final Map<String, Integer> result = givenList.stream().collect(toMap(Function.identity(), String::length, (i1, i2) -> i1));
assertThat(result).containsEntry("a", 1).containsEntry("bb", 2).containsEntry("ccc", 3).containsEntry("dd", 2);
}
@Test
public void whenCollectingAndThen_shouldCollect() throws Exception {
final List<String> result = givenList.stream().collect(collectingAndThen(toList(), ImmutableList::copyOf));
assertThat(result).containsAll(givenList).isInstanceOf(ImmutableList.class);
}
@Test
public void whenJoining_shouldJoin() throws Exception {
final String result = givenList.stream().collect(joining());
assertThat(result).isEqualTo("abbcccdd");
}
@Test
public void whenJoiningWithSeparator_shouldJoinWithSeparator() throws Exception {
final String result = givenList.stream().collect(joining(" "));
assertThat(result).isEqualTo("a bb ccc dd");
}
@Test
public void whenJoiningWithSeparatorAndPrefixAndPostfix_shouldJoinWithSeparatorPrePost() throws Exception {
final String result = givenList.stream().collect(joining(" ", "PRE-", "-POST"));
assertThat(result).isEqualTo("PRE-a bb ccc dd-POST");
}
@Test
public void whenPartitioningBy_shouldPartition() throws Exception {
final Map<Boolean, List<String>> result = givenList.stream().collect(partitioningBy(s -> s.length() > 2));
assertThat(result).containsKeys(true, false).satisfies(booleanListMap -> {
assertThat(booleanListMap.get(true)).contains("ccc");
assertThat(booleanListMap.get(false)).contains("a", "bb", "dd");
});
}
@Test
public void whenCounting_shouldCount() throws Exception {
final Long result = givenList.stream().collect(counting());
assertThat(result).isEqualTo(4);
}
@Test
public void whenSummarizing_shouldSummarize() throws Exception {
final DoubleSummaryStatistics result = givenList.stream().collect(summarizingDouble(String::length));
assertThat(result.getAverage()).isEqualTo(2);
assertThat(result.getCount()).isEqualTo(4);
assertThat(result.getMax()).isEqualTo(3);
assertThat(result.getMin()).isEqualTo(1);
assertThat(result.getSum()).isEqualTo(8);
}
@Test
public void whenAveraging_shouldAverage() throws Exception {
final Double result = givenList.stream().collect(averagingDouble(String::length));
assertThat(result).isEqualTo(2);
}
@Test
public void whenSumming_shouldSum() throws Exception {
final Double result = givenList.stream().filter(i -> true).collect(summingDouble(String::length));
assertThat(result).isEqualTo(8);
}
@Test
public void whenMaxingBy_shouldMaxBy() throws Exception {
final Optional<String> result = givenList.stream().collect(maxBy(Comparator.naturalOrder()));
assertThat(result).isPresent().hasValue("dd");
}
@Test
public void whenGroupingBy_shouldGroupBy() throws Exception {
final Map<Integer, Set<String>> result = givenList.stream().collect(groupingBy(String::length, toSet()));
assertThat(result).containsEntry(1, newHashSet("a")).containsEntry(2, newHashSet("bb", "dd")).containsEntry(3, newHashSet("ccc"));
}
@Test
public void whenCreatingCustomCollector_shouldCollect() throws Exception {
final ImmutableSet<String> result = givenList.stream().collect(toImmutableSet());
assertThat(result).isInstanceOf(ImmutableSet.class).contains("a", "bb", "ccc", "dd");
}
private static <T> ImmutableSetCollector<T> toImmutableSet() {
return new ImmutableSetCollector<>();
}
private static class ImmutableSetCollector<T> implements Collector<T, ImmutableSet.Builder<T>, ImmutableSet<T>> {
@Override
public Supplier<ImmutableSet.Builder<T>> supplier() {
return ImmutableSet::builder;
}
@Override
public BiConsumer<ImmutableSet.Builder<T>, T> accumulator() {
return ImmutableSet.Builder::add;
}
@Override
public BinaryOperator<ImmutableSet.Builder<T>> combiner() {
return (left, right) -> left.addAll(right.build());
}
@Override
public Function<ImmutableSet.Builder<T>, ImmutableSet<T>> finisher() {
return ImmutableSet.Builder::build;
}
@Override
public Set<Characteristics> characteristics() {
return Sets.immutableEnumSet(Characteristics.UNORDERED);
}
}
}
core-java-8/src/test/java/com/baeldung/dateapi/ConversionExample.java
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package com.baeldung.dateapi;
import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;
public class ConversionExample {
public static void main(String[] args) {
Instant instantFromCalendar = GregorianCalendar.getInstance().toInstant();
ZonedDateTime zonedDateTimeFromCalendar = new GregorianCalendar().toZonedDateTime();
Date dateFromInstant = Date.from(Instant.now());
GregorianCalendar calendarFromZonedDateTime = GregorianCalendar.from(ZonedDateTime.now());
Instant instantFromDate = new Date().toInstant();
ZoneId zoneIdFromTimeZone = TimeZone.getTimeZone("PST").toZoneId();
}
}
core-java-8/src/test/java/com/baeldung/dateapi/JavaDurationUnitTest.java
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package com.baeldung.dateapi;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import java.time.Duration;
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import org.junit.Test;
public class JavaDurationUnitTest {
@Test
public void test2() {
Instant start = Instant.parse("2017-10-03T10:15:30.00Z");
Instant end = Instant.parse("2017-10-03T10:16:30.00Z");
Duration duration = Duration.between(start, end);
assertFalse(duration.isNegative());
assertEquals(60, duration.getSeconds());
assertEquals(1, duration.toMinutes());
Duration fromDays = Duration.ofDays(1);
assertEquals(86400, fromDays.getSeconds());
Duration fromMinutes = Duration.ofMinutes(60);
assertEquals(1, fromMinutes.toHours());
assertEquals(120, duration.plusSeconds(60).getSeconds());
assertEquals(30, duration.minusSeconds(30).getSeconds());
assertEquals(120, duration.plus(60, ChronoUnit.SECONDS).getSeconds());
assertEquals(30, duration.minus(30, ChronoUnit.SECONDS).getSeconds());
Duration fromChar1 = Duration.parse("P1DT1H10M10.5S");
Duration fromChar2 = Duration.parse("PT10M");
}
}
core-java-8/src/test/java/com/baeldung/dateapi/JavaPeriodUnitTest.java
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package com.baeldung.dateapi;
import org.apache.log4j.Logger;
import org.junit.Test;
import java.time.LocalDate;
import java.time.Period;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
public class JavaPeriodUnitTest {
private static final Logger LOG = Logger.getLogger(JavaPeriodUnitTest.class);
@Test
public void whenTestPeriod_thenOk() {
LocalDate startDate = LocalDate.of(2015, 2, 15);
LocalDate endDate = LocalDate.of(2017, 1, 21);
Period period = Period.between(startDate, endDate);
LOG.info(String.format("Years:%d months:%d days:%d", period.getYears(), period.getMonths(), period.getDays()));
assertFalse(period.isNegative());
assertEquals(56, period.plusDays(50).getDays());
assertEquals(9, period.minusMonths(2).getMonths());
Period fromUnits = Period.of(3, 10, 10);
Period fromDays = Period.ofDays(50);
Period fromMonths = Period.ofMonths(5);
Period fromYears = Period.ofYears(10);
Period fromWeeks = Period.ofWeeks(40);
assertEquals(280, fromWeeks.getDays());
Period fromCharYears = Period.parse("P2Y");
assertEquals(2, fromCharYears.getYears());
Period fromCharUnits = Period.parse("P2Y3M5D");
assertEquals(5, fromCharUnits.getDays());
}
}
core-java-8/src/test/java/com/baeldung/dateapi/JavaUtilTimeUnitTest.java
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package com.baeldung.dateapi;
import org.junit.Test;
import java.text.ParseException;
import java.time.Duration;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.Month;
import java.time.YearMonth;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import static org.assertj.core.api.Assertions.assertThat;
public class JavaUtilTimeUnitTest {
@Test
public void currentTime() {
final LocalDate now = LocalDate.now();
System.out.println(now);
// there is not much to test here
}
@Test
public void specificTime() {
LocalDate birthDay = LocalDate.of(1990, Month.DECEMBER, 15);
System.out.println(birthDay);
// there is not much to test here
}
@Test
public void extractMonth() {
Month month = LocalDate.of(1990, Month.DECEMBER, 15).getMonth();
assertThat(month).isEqualTo(Month.DECEMBER);
}
@Test
public void subtractTime() {
LocalDateTime fiveHoursBefore = LocalDateTime.of(1990, Month.DECEMBER, 15, 15, 0).minusHours(5);
assertThat(fiveHoursBefore.getHour()).isEqualTo(10);
}
@Test
public void alterField() {
LocalDateTime inJune = LocalDateTime.of(1990, Month.DECEMBER, 15, 15, 0).with(Month.JUNE);
assertThat(inJune.getMonth()).isEqualTo(Month.JUNE);
}
@Test
public void truncate() {
LocalTime truncated = LocalTime.of(15, 12, 34).truncatedTo(ChronoUnit.HOURS);
assertThat(truncated).isEqualTo(LocalTime.of(15, 0, 0));
}
@Test
public void getTimeSpan() {
LocalDateTime now = LocalDateTime.now();
LocalDateTime hourLater = now.plusHours(1);
Duration span = Duration.between(now, hourLater);
assertThat(span).isEqualTo(Duration.ofHours(1));
}
@Test
public void formatAndParse() throws ParseException {
LocalDate someDate = LocalDate.of(2016, 12, 7);
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
String formattedDate = someDate.format(formatter);
LocalDate parsedDate = LocalDate.parse(formattedDate, formatter);
assertThat(formattedDate).isEqualTo("2016-12-07");
assertThat(parsedDate).isEqualTo(someDate);
}
@Test
public void daysInMonth() {
int daysInMonth = YearMonth.of(1990, 2).lengthOfMonth();
assertThat(daysInMonth).isEqualTo(28);
}
}
core-java-8/src/test/java/com/baeldung/datetime/UseLocalDateTimeUnitTest.java
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package com.baeldung.datetime;
import java.time.LocalDate;
import java.time.LocalTime;
import java.time.Month;
import org.junit.Assert;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class UseLocalDateTimeUnitTest {
UseLocalDateTime useLocalDateTime = new UseLocalDateTime();
@Test
public void givenString_whenUsingParse_thenLocalDateTime() {
assertEquals(LocalDate.of(2016, Month.MAY, 10), useLocalDateTime.getLocalDateTimeUsingParseMethod("2016-05-10T06:30")
.toLocalDate());
assertEquals(LocalTime.of(6, 30), useLocalDateTime.getLocalDateTimeUsingParseMethod("2016-05-10T06:30")
.toLocalTime());
}
}
core-java-8/src/test/java/com/baeldung/datetime/UseLocalDateUnitTest.java
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package com.baeldung.datetime;
import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.LocalDateTime;
import org.junit.Assert;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class UseLocalDateUnitTest {
UseLocalDate useLocalDate = new UseLocalDate();
@Test
public void givenValues_whenUsingFactoryOf_thenLocalDate() {
assertEquals("2016-05-10", useLocalDate.getLocalDateUsingFactoryOfMethod(2016, 5, 10)
.toString());
}
@Test
public void givenString_whenUsingParse_thenLocalDate() {
assertEquals("2016-05-10", useLocalDate.getLocalDateUsingParseMethod("2016-05-10")
.toString());
}
@Test
public void whenUsingClock_thenLocalDate() {
assertEquals(LocalDate.now(), useLocalDate.getLocalDateFromClock());
}
@Test
public void givenDate_whenUsingPlus_thenNextDay() {
assertEquals(LocalDate.now()
.plusDays(1), useLocalDate.getNextDay(LocalDate.now()));
}
@Test
public void givenDate_whenUsingMinus_thenPreviousDay() {
assertEquals(LocalDate.now()
.minusDays(1), useLocalDate.getPreviousDay(LocalDate.now()));
}
@Test
public void givenToday_whenUsingGetDayOfWeek_thenDayOfWeek() {
assertEquals(DayOfWeek.SUNDAY, useLocalDate.getDayOfWeek(LocalDate.parse("2016-05-22")));
}
@Test
public void givenToday_whenUsingWithTemporalAdjuster_thenFirstDayOfMonth() {
assertEquals(1, useLocalDate.getFirstDayOfMonth()
.getDayOfMonth());
}
@Test
public void givenLocalDate_whenUsingAtStartOfDay_thenReturnMidnight() {
assertEquals(LocalDateTime.parse("2016-05-22T00:00:00"), useLocalDate.getStartOfDay(LocalDate.parse("2016-05-22")));
}
}
core-java-8/src/test/java/com/baeldung/datetime/UseLocalTimeUnitTest.java
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package com.baeldung.datetime;
import java.time.LocalTime;
import org.junit.Assert;
import org.junit.Test;
public class UseLocalTimeUnitTest {
UseLocalTime useLocalTime = new UseLocalTime();
@Test
public void givenValues_whenUsingFactoryOf_thenLocalTime() {
Assert.assertEquals("07:07:07", useLocalTime.getLocalTimeUsingFactoryOfMethod(7, 7, 7).toString());
}
@Test
public void givenString_whenUsingParse_thenLocalTime() {
Assert.assertEquals("06:30", useLocalTime.getLocalTimeUsingParseMethod("06:30").toString());
}
@Test
public void givenTime_whenAddHour_thenLocalTime() {
Assert.assertEquals("07:30", useLocalTime.addAnHour(LocalTime.of(6, 30)).toString());
}
@Test
public void getHourFromLocalTime() {
Assert.assertEquals(1, useLocalTime.getHourFromLocalTime(LocalTime.of(1, 1)));
}
@Test
public void getLocalTimeWithMinuteSetToValue() {
Assert.assertEquals(LocalTime.of(10, 20), useLocalTime.getLocalTimeWithMinuteSetToValue(LocalTime.of(10, 10), 20));
}
}
core-java-8/src/test/java/com/baeldung/datetime/UsePeriodUnitTest.java
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package com.baeldung.datetime;
import java.time.LocalDate;
import java.time.Period;
import org.junit.Assert;
import org.junit.Test;
public class UsePeriodUnitTest {
UsePeriod usingPeriod = new UsePeriod();
@Test
public void givenPeriodAndLocalDate_thenCalculateModifiedDate() {
Period period = Period.ofDays(1);
LocalDate localDate = LocalDate.parse("2007-05-10");
Assert.assertEquals(localDate.plusDays(1), usingPeriod.modifyDates(localDate, period));
}
@Test
public void givenDates_thenGetPeriod() {
LocalDate localDate1 = LocalDate.parse("2007-05-10");
LocalDate localDate2 = LocalDate.parse("2007-05-15");
Assert.assertEquals(Period.ofDays(5), usingPeriod.getDifferenceBetweenDates(localDate1, localDate2));
}
}
core-java-8/src/test/java/com/baeldung/datetime/UseZonedDateTimeUnitTest.java
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package com.baeldung.datetime;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import org.junit.Assert;
import org.junit.Test;
public class UseZonedDateTimeUnitTest {
UseZonedDateTime zonedDateTime = new UseZonedDateTime();
@Test
public void givenZoneId_thenZonedDateTime() {
ZoneId zoneId = ZoneId.of("Europe/Paris");
ZonedDateTime zonedDatetime = zonedDateTime.getZonedDateTime(LocalDateTime.parse("2016-05-20T06:30"), zoneId);
Assert.assertEquals(zoneId, ZoneId.from(zonedDatetime));
}
}
core-java-8/src/test/java/com/baeldung/doublecolon/ComputerUtilsUnitTest.java
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package com.baeldung.doublecolon;
import com.baeldung.doublecolon.function.TriFunction;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.function.BiFunction;
import static com.baeldung.doublecolon.ComputerUtils.*;
public class ComputerUtilsUnitTest {
@Before
public void setup() {
}
@After
public void tearDown() {
}
@Test
public void testConstructorReference() {
Computer c1 = new Computer(2015, "white");
Computer c2 = new Computer(2009, "black");
Computer c3 = new Computer(2014, "black");
BiFunction<Integer, String, Computer> c4Function = Computer::new;
Computer c4 = c4Function.apply(2013, "white");
BiFunction<Integer, String, Computer> c5Function = Computer::new;
Computer c5 = c5Function.apply(2010, "black");
BiFunction<Integer, String, Computer> c6Function = Computer::new;
Computer c6 = c6Function.apply(2008, "black");
List<Computer> inventory = Arrays.asList(c1, c2, c3, c4, c5, c6);
List<Computer> blackComputer = filter(inventory, blackPredicate);
Assert.assertEquals("The black Computers are: ", blackComputer.size(), 4);
List<Computer> after2010Computer = filter(inventory, after2010Predicate);
Assert.assertEquals("The Computer bought after 2010 are: ", after2010Computer.size(), 3);
List<Computer> before2011Computer = filter(inventory, c -> c.getAge() < 2011);
Assert.assertEquals("The Computer bought before 2011 are: ", before2011Computer.size(), 3);
inventory.sort(Comparator.comparing(Computer::getAge));
Assert.assertEquals("Oldest Computer in inventory", c6, inventory.get(0));
}
@Test
public void testStaticMethodReference() {
Computer c1 = new Computer(2015, "white", 35);
Computer c2 = new Computer(2009, "black", 65);
TriFunction<Integer, String, Integer, Computer> c6Function = Computer::new;
Computer c3 = c6Function.apply(2008, "black", 90);
List<Computer> inventory = Arrays.asList(c1, c2, c3);
inventory.forEach(ComputerUtils::repair);
Assert.assertEquals("Computer repaired", new Integer(100), c1.getHealty());
}
@Test
public void testInstanceMethodArbitraryObjectParticularType() {
Computer c1 = new Computer(2015, "white", 35);
Computer c2 = new MacbookPro(2009, "black", 65);
List<Computer> inventory = Arrays.asList(c1, c2);
inventory.forEach(Computer::turnOnPc);
}
@Test
public void testSuperMethodReference() {
final TriFunction<Integer, String, Integer, MacbookPro> integerStringIntegerObjectTriFunction = MacbookPro::new;
final MacbookPro macbookPro = integerStringIntegerObjectTriFunction.apply(2010, "black", 100);
Double initialValue = 999.99;
final Double actualValue = macbookPro.calculateValue(initialValue);
Assert.assertEquals(766.659, actualValue, 0.0);
}
}
core-java-8/src/test/java/com/baeldung/functionalinterface/FunctionalInterfaceUnitTest.java
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package com.baeldung.functionalinterface;
import com.google.common.util.concurrent.Uninterruptibles;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static org.junit.Assert.*;
public class FunctionalInterfaceUnitTest {
private static final Logger LOG = LoggerFactory.getLogger(FunctionalInterfaceUnitTest.class);
@Test
public void whenPassingLambdaToComputeIfAbsent_thenTheValueGetsComputedAndPutIntoMap() {
Map<String, Integer> nameMap = new HashMap<>();
Integer value = nameMap.computeIfAbsent("John", String::length);
assertEquals(new Integer(4), nameMap.get("John"));
assertEquals(new Integer(4), value);
}
@Test
public void whenPassingMethodReferenceToComputeIfAbsent_thenTheValueGetsComputedAndPutIntoMap() {
Map<String, Integer> nameMap = new HashMap<>();
Integer value = nameMap.computeIfAbsent("John", String::length);
assertEquals(new Integer(4), nameMap.get("John"));
assertEquals(new Integer(4), value);
}
@Test
public void whenUsingCustomFunctionalInterfaceForPrimitives_thenCanUseItAsLambda() {
short[] array = { (short) 1, (short) 2, (short) 3 };
byte[] transformedArray = transformArray(array, s -> (byte) (s * 2));
byte[] expectedArray = { (byte) 2, (byte) 4, (byte) 6 };
assertArrayEquals(expectedArray, transformedArray);
}
@Test
public void whenUsingBiFunction_thenCanUseItToReplaceMapValues() {
Map<String, Integer> salaries = new HashMap<>();
salaries.put("John", 40000);
salaries.put("Freddy", 30000);
salaries.put("Samuel", 50000);
salaries.replaceAll((name, oldValue) -> name.equals("Freddy") ? oldValue : oldValue + 10000);
assertEquals(new Integer(50000), salaries.get("John"));
assertEquals(new Integer(30000), salaries.get("Freddy"));
assertEquals(new Integer(60000), salaries.get("Samuel"));
}
@Test
public void whenPassingLambdaToThreadConstructor_thenLambdaInferredToRunnable() {
Thread thread = new Thread(() -> LOG.debug("Hello From Another Thread"));
thread.start();
}
@Test
public void whenUsingSupplierToGenerateNumbers_thenCanUseItInStreamGenerate() {
int[] fibs = { 0, 1 };
Stream<Integer> fibonacci = Stream.generate(() -> {
int result = fibs[1];
int fib3 = fibs[0] + fibs[1];
fibs[0] = fibs[1];
fibs[1] = fib3;
return result;
});
List<Integer> fibonacci5 = fibonacci.limit(5)
.collect(Collectors.toList());
assertEquals(new Integer(1), fibonacci5.get(0));
assertEquals(new Integer(1), fibonacci5.get(1));
assertEquals(new Integer(2), fibonacci5.get(2));
assertEquals(new Integer(3), fibonacci5.get(3));
assertEquals(new Integer(5), fibonacci5.get(4));
}
@Test
public void whenUsingConsumerInForEach_thenConsumerExecutesForEachListElement() {
List<String> names = Arrays.asList("John", "Freddy", "Samuel");
names.forEach(name -> LOG.debug("Hello, " + name));
}
@Test
public void whenUsingBiConsumerInForEach_thenConsumerExecutesForEachMapElement() {
Map<String, Integer> ages = new HashMap<>();
ages.put("John", 25);
ages.put("Freddy", 24);
ages.put("Samuel", 30);
ages.forEach((name, age) -> LOG.debug(name + " is " + age + " years old"));
}
@Test
public void whenUsingPredicateInFilter_thenListValuesAreFilteredOut() {
List<String> names = Arrays.asList("Angela", "Aaron", "Bob", "Claire", "David");
List<String> namesWithA = names.stream()
.filter(name -> name.startsWith("A"))
.collect(Collectors.toList());
assertEquals(2, namesWithA.size());
assertTrue(namesWithA.contains("Angela"));
assertTrue(namesWithA.contains("Aaron"));
}
@Test
public void whenUsingUnaryOperatorWithReplaceAll_thenAllValuesInTheListAreReplaced() {
List<String> names = Arrays.asList("bob", "josh", "megan");
names.replaceAll(String::toUpperCase);
assertEquals("BOB", names.get(0));
assertEquals("JOSH", names.get(1));
assertEquals("MEGAN", names.get(2));
}
@Test
public void whenUsingBinaryOperatorWithStreamReduce_thenResultIsSumOfValues() {
List<Integer> values = Arrays.asList(3, 5, 8, 9, 12);
int sum = values.stream()
.reduce(0, (i1, i2) -> i1 + i2);
assertEquals(37, sum);
}
@Test
public void whenComposingTwoFunctions_thenFunctionsExecuteSequentially() {
Function<Integer, String> intToString = Object::toString;
Function<String, String> quote = s -> "'" + s + "'";
Function<Integer, String> quoteIntToString = quote.compose(intToString);
assertEquals("'5'", quoteIntToString.apply(5));
}
@Test
public void whenUsingSupplierToGenerateValue_thenValueIsGeneratedLazily() {
Supplier<Double> lazyValue = () -> {
Uninterruptibles.sleepUninterruptibly(1000, TimeUnit.MILLISECONDS);
return 9d;
};
double valueSquared = squareLazy(lazyValue);
assertEquals(81d, valueSquared, 0);
}
//
public double squareLazy(Supplier<Double> lazyValue) {
return Math.pow(lazyValue.get(), 2);
}
public byte[] transformArray(short[] array, ShortToByteFunction function) {
byte[] transformedArray = new byte[array.length];
for (int i = 0; i < array.length; i++) {
transformedArray[i] = function.applyAsByte(array[i]);
}
return transformedArray;
}
}
core-java-8/src/test/java/com/baeldung/functionalinterface/ShortToByteFunction.java
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package com.baeldung.functionalinterface;
@FunctionalInterface
public interface ShortToByteFunction {
byte applyAsByte(short s);
}
core-java-8/src/test/java/com/baeldung/java8/Java8CollectionCleanupUnitTest.java
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package com.baeldung.java8;
import com.google.common.collect.Lists;
import org.junit.Test;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import static org.hamcrest.Matchers.hasSize;
import static org.junit.Assert.assertThat;
public class Java8CollectionCleanupUnitTest {
// tests -
@Test
public void givenListContainsNulls_whenFilteringParallel_thenCorrect() {
final List<Integer> list = Lists.newArrayList(null, 1, 2, null, 3, null);
final List<Integer> listWithoutNulls = list.parallelStream().filter(Objects::nonNull).collect(Collectors.toList());
assertThat(listWithoutNulls, hasSize(3));
}
@Test
public void givenListContainsNulls_whenFilteringSerial_thenCorrect() {
final List<Integer> list = Lists.newArrayList(null, 1, 2, null, 3, null);
final List<Integer> listWithoutNulls = list.stream().filter(Objects::nonNull).collect(Collectors.toList());
assertThat(listWithoutNulls, hasSize(3));
}
@Test
public void givenListContainsNulls_whenRemovingNullsWithRemoveIf_thenCorrect() {
final List<Integer> listWithoutNulls = Lists.newArrayList(null, 1, 2, null, 3, null);
listWithoutNulls.removeIf(Objects::isNull);
assertThat(listWithoutNulls, hasSize(3));
}
@Test
public void givenListContainsDuplicates_whenRemovingDuplicatesWithJava8_thenCorrect() {
final List<Integer> listWithDuplicates = Lists.newArrayList(1, 1, 2, 2, 3, 3);
final List<Integer> listWithoutDuplicates = listWithDuplicates.parallelStream().distinct().collect(Collectors.toList());
assertThat(listWithoutDuplicates, hasSize(3));
}
}
core-java-8/src/test/java/com/baeldung/java8/Java8DefaultStaticIntefaceMethodsUnitTest.java
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package com.baeldung.java8;
import com.baeldung.java_8_features.Vehicle;
import com.baeldung.java_8_features.VehicleImpl;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class Java8DefaultStaticIntefaceMethodsUnitTest {
@Test
public void callStaticInterfaceMethdosMethods_whenExpectedResults_thenCorrect() {
Vehicle vehicle = new VehicleImpl();
String overview = vehicle.getOverview();
long[] startPosition = vehicle.startPosition();
assertEquals(overview, "ATV made by N&F Vehicles");
assertEquals(startPosition[0], 23);
assertEquals(startPosition[1], 15);
}
@Test
public void callDefaultInterfaceMethods_whenExpectedResults_thenCorrect() {
String producer = Vehicle.producer();
assertEquals(producer, "N&F Vehicles");
}
}
core-java-8/src/test/java/com/baeldung/java8/Java8FindAnyFindFirstUnitTest.java
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package com.baeldung.java8;
import org.junit.Test;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import static org.hamcrest.Matchers.anyOf;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
public class Java8FindAnyFindFirstUnitTest {
@Test
public void createStream_whenFindAnyResultIsPresent_thenCorrect() {
List<String> list = Arrays.asList("A", "B", "C", "D");
Optional<String> result = list.stream().findAny();
assertTrue(result.isPresent());
assertThat(result.get(), anyOf(is("A"), is("B"), is("C"), is("D")));
}
@Test
public void createParallelStream_whenFindAnyResultIsPresent_thenCorrect() throws Exception {
List<Integer> list = Arrays.asList(1, 2, 3, 4, 5);
Optional<Integer> result = list.stream().parallel().filter(num -> num < 4).findAny();
assertTrue(result.isPresent());
assertThat(result.get(), anyOf(is(1), is(2), is(3)));
}
@Test
public void createStream_whenFindFirstResultIsPresent_thenCorrect() {
List<String> list = Arrays.asList("A", "B", "C", "D");
Optional<String> result = list.stream().findFirst();
assertTrue(result.isPresent());
assertThat(result.get(), is("A"));
}
}
core-java-8/src/test/java/com/baeldung/java8/Java8ForEachUnitTest.java
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package com.baeldung.java8;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;
public class Java8ForEachUnitTest {
private static final Logger LOG = LoggerFactory.getLogger(Java8ForEachUnitTest.class);
@Test
public void compareForEachMethods_thenPrintResults() {
List<String> names = new ArrayList<>();
names.add("Larry");
names.add("Steve");
names.add("James");
names.add("Conan");
names.add("Ellen");
// Java 5 - for-loop
LOG.debug("--- Enhanced for-loop ---");
for (String name : names) {
LOG.debug(name);
}
// Java 8 - forEach
LOG.debug("--- forEach method ---");
names.forEach(name -> LOG.debug(name));
// Anonymous inner class that implements Consumer interface
LOG.debug("--- Anonymous inner class ---");
names.forEach(new Consumer<String>() {
public void accept(String name) {
LOG.debug(name);
}
});
// Create a Consumer implementation to then use in a forEach method
Consumer<String> consumerNames = name -> {
LOG.debug(name);
};
LOG.debug("--- Implementation of Consumer interface ---");
names.forEach(consumerNames);
// Print elements using a Method Reference
LOG.debug("--- Method Reference ---");
names.forEach(LOG::debug);
}
}
core-java-8/src/test/java/com/baeldung/java8/Java8FunctionalInteracesLambdasUnitTest.java
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package com.baeldung.java8;
import com.baeldung.Foo;
import com.baeldung.FooExtended;
import com.baeldung.UseFoo;
import org.junit.Before;
import org.junit.Test;
import java.util.function.Function;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
public class Java8FunctionalInteracesLambdasUnitTest {
private UseFoo useFoo;
@Before
public void init() {
useFoo = new UseFoo();
}
@Test
public void functionalInterfaceInstantiation_whenReturnDefiniteString_thenCorrect() {
final Foo foo = parameter -> parameter + "from lambda";
final String result = useFoo.add("Message ", foo);
assertEquals("Message from lambda", result);
}
@Test
public void standardFIParameter_whenReturnDefiniteString_thenCorrect() {
final Function<String, String> fn = parameter -> parameter + "from lambda";
final String result = useFoo.addWithStandardFI("Message ", fn);
assertEquals("Message from lambda", result);
}
@Test
public void defaultMethodFromExtendedInterface_whenReturnDefiniteString_thenCorrect() {
final FooExtended fooExtended = string -> string;
final String result = fooExtended.defaultMethod();
assertEquals("String from Bar", result);
}
@Test
public void lambdaAndInnerClassInstantiation_whenReturnSameString_thenCorrect() {
final Foo foo = parameter -> parameter + "from Foo";
final Foo fooByIC = new Foo() {
@Override
public String method(final String string) {
return string + "from Foo";
}
};
assertEquals(foo.method("Something "), fooByIC.method("Something "));
}
@Test
public void accessVariablesFromDifferentScopes_whenReturnPredefinedString_thenCorrect() {
assertEquals("Results: resultIC = Inner class value, resultLambda = Enclosing scope value", useFoo.scopeExperiment());
}
@Test
public void shorteningLambdas_whenReturnEqualsResults_thenCorrect() {
final Foo foo = parameter -> buildString(parameter);
final Foo fooHuge = parameter -> {
final String result = "Something " + parameter;
// many lines of code
return result;
};
assertEquals(foo.method("Something"), fooHuge.method("Something"));
}
private String buildString(final String parameter) {
final String result = "Something " + parameter;
// many lines of code
return result;
}
@Test
public void mutatingOfEffectivelyFinalVariable_whenNotEquals_thenCorrect() {
final int[] total = new int[1];
final Runnable r = () -> total[0]++;
r.run();
assertNotEquals(0, total[0]);
}
}
core-java-8/src/test/java/com/baeldung/java8/Java8GroupingByCollectorUnitTest.java
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package com.baeldung.java8;
import com.baeldung.java_8_features.groupingby.BlogPost;
import com.baeldung.java_8_features.groupingby.BlogPostType;
import org.junit.Test;
import java.util.*;
import java.util.concurrent.ConcurrentMap;
import static java.util.Comparator.comparingInt;
import static java.util.stream.Collectors.*;
import static org.junit.Assert.*;
public class Java8GroupingByCollectorUnitTest {
private static final List<BlogPost> posts = Arrays.asList(new BlogPost("News item 1", "Author 1", BlogPostType.NEWS, 15), new BlogPost("Tech review 1", "Author 2", BlogPostType.REVIEW, 5),
new BlogPost("Programming guide", "Author 1", BlogPostType.GUIDE, 20), new BlogPost("News item 2", "Author 2", BlogPostType.NEWS, 35), new BlogPost("Tech review 2", "Author 1", BlogPostType.REVIEW, 15));
@Test
public void givenAListOfPosts_whenGroupedByType_thenGetAMapBetweenTypeAndPosts() {
Map<BlogPostType, List<BlogPost>> postsPerType = posts.stream()
.collect(groupingBy(BlogPost::getType));
assertEquals(2, postsPerType.get(BlogPostType.NEWS)
.size());
assertEquals(1, postsPerType.get(BlogPostType.GUIDE)
.size());
assertEquals(2, postsPerType.get(BlogPostType.REVIEW)
.size());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeAndTheirTitlesAreJoinedInAString_thenGetAMapBetweenTypeAndCsvTitles() {
Map<BlogPostType, String> postsPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, mapping(BlogPost::getTitle, joining(", ", "Post titles: [", "]"))));
assertEquals("Post titles: [News item 1, News item 2]", postsPerType.get(BlogPostType.NEWS));
assertEquals("Post titles: [Programming guide]", postsPerType.get(BlogPostType.GUIDE));
assertEquals("Post titles: [Tech review 1, Tech review 2]", postsPerType.get(BlogPostType.REVIEW));
}
@Test
public void givenAListOfPosts_whenGroupedByTypeAndSumTheLikes_thenGetAMapBetweenTypeAndPostLikes() {
Map<BlogPostType, Integer> likesPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, summingInt(BlogPost::getLikes)));
assertEquals(50, likesPerType.get(BlogPostType.NEWS)
.intValue());
assertEquals(20, likesPerType.get(BlogPostType.REVIEW)
.intValue());
assertEquals(20, likesPerType.get(BlogPostType.GUIDE)
.intValue());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeInAnEnumMap_thenGetAnEnumMapBetweenTypeAndPosts() {
EnumMap<BlogPostType, List<BlogPost>> postsPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, () -> new EnumMap<>(BlogPostType.class), toList()));
assertEquals(2, postsPerType.get(BlogPostType.NEWS)
.size());
assertEquals(1, postsPerType.get(BlogPostType.GUIDE)
.size());
assertEquals(2, postsPerType.get(BlogPostType.REVIEW)
.size());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeInSets_thenGetAMapBetweenTypesAndSetsOfPosts() {
Map<BlogPostType, Set<BlogPost>> postsPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, toSet()));
assertEquals(2, postsPerType.get(BlogPostType.NEWS)
.size());
assertEquals(1, postsPerType.get(BlogPostType.GUIDE)
.size());
assertEquals(2, postsPerType.get(BlogPostType.REVIEW)
.size());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeConcurrently_thenGetAMapBetweenTypeAndPosts() {
ConcurrentMap<BlogPostType, List<BlogPost>> postsPerType = posts.parallelStream()
.collect(groupingByConcurrent(BlogPost::getType));
assertEquals(2, postsPerType.get(BlogPostType.NEWS)
.size());
assertEquals(1, postsPerType.get(BlogPostType.GUIDE)
.size());
assertEquals(2, postsPerType.get(BlogPostType.REVIEW)
.size());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeAndAveragingLikes_thenGetAMapBetweenTypeAndAverageNumberOfLikes() {
Map<BlogPostType, Double> averageLikesPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, averagingInt(BlogPost::getLikes)));
assertEquals(25, averageLikesPerType.get(BlogPostType.NEWS)
.intValue());
assertEquals(20, averageLikesPerType.get(BlogPostType.GUIDE)
.intValue());
assertEquals(10, averageLikesPerType.get(BlogPostType.REVIEW)
.intValue());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeAndCounted_thenGetAMapBetweenTypeAndNumberOfPosts() {
Map<BlogPostType, Long> numberOfPostsPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, counting()));
assertEquals(2, numberOfPostsPerType.get(BlogPostType.NEWS)
.intValue());
assertEquals(1, numberOfPostsPerType.get(BlogPostType.GUIDE)
.intValue());
assertEquals(2, numberOfPostsPerType.get(BlogPostType.REVIEW)
.intValue());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeAndMaxingLikes_thenGetAMapBetweenTypeAndMaximumNumberOfLikes() {
Map<BlogPostType, Optional<BlogPost>> maxLikesPerPostType = posts.stream()
.collect(groupingBy(BlogPost::getType, maxBy(comparingInt(BlogPost::getLikes))));
assertTrue(maxLikesPerPostType.get(BlogPostType.NEWS)
.isPresent());
assertEquals(35, maxLikesPerPostType.get(BlogPostType.NEWS)
.get()
.getLikes());
assertTrue(maxLikesPerPostType.get(BlogPostType.GUIDE)
.isPresent());
assertEquals(20, maxLikesPerPostType.get(BlogPostType.GUIDE)
.get()
.getLikes());
assertTrue(maxLikesPerPostType.get(BlogPostType.REVIEW)
.isPresent());
assertEquals(15, maxLikesPerPostType.get(BlogPostType.REVIEW)
.get()
.getLikes());
}
@Test
public void givenAListOfPosts_whenGroupedByAuthorAndThenByType_thenGetAMapBetweenAuthorAndMapsBetweenTypeAndBlogPosts() {
Map<String, Map<BlogPostType, List<BlogPost>>> map = posts.stream()
.collect(groupingBy(BlogPost::getAuthor, groupingBy(BlogPost::getType)));
assertEquals(1, map.get("Author 1")
.get(BlogPostType.NEWS)
.size());
assertEquals(1, map.get("Author 1")
.get(BlogPostType.GUIDE)
.size());
assertEquals(1, map.get("Author 1")
.get(BlogPostType.REVIEW)
.size());
assertEquals(1, map.get("Author 2")
.get(BlogPostType.NEWS)
.size());
assertEquals(1, map.get("Author 2")
.get(BlogPostType.REVIEW)
.size());
assertNull(map.get("Author 2")
.get(BlogPostType.GUIDE));
}
@Test
public void givenAListOfPosts_whenGroupedByTypeAndSummarizingLikes_thenGetAMapBetweenTypeAndSummary() {
Map<BlogPostType, IntSummaryStatistics> likeStatisticsPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, summarizingInt(BlogPost::getLikes)));
IntSummaryStatistics newsLikeStatistics = likeStatisticsPerType.get(BlogPostType.NEWS);
assertEquals(2, newsLikeStatistics.getCount());
assertEquals(50, newsLikeStatistics.getSum());
assertEquals(25.0, newsLikeStatistics.getAverage(), 0.001);
assertEquals(35, newsLikeStatistics.getMax());
assertEquals(15, newsLikeStatistics.getMin());
}
}
core-java-8/src/test/java/com/baeldung/java8/Java8MaxMinUnitTest.java
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package com.baeldung.java8;
import com.baeldung.java_8_features.Person;
import org.junit.Test;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.NoSuchElementException;
import static org.junit.Assert.assertEquals;
public class Java8MaxMinUnitTest {
@Test
public void whenListIsOfIntegerThenMaxCanBeDoneUsingIntegerComparator() {
//given
final List<Integer> listOfIntegers = Arrays.asList(1, 2, 3, 4, 56, 7, 89, 10);
final Integer expectedResult = 89;
//then
final Integer max = listOfIntegers
.stream()
.mapToInt(v -> v)
.max().orElseThrow(NoSuchElementException::new);
assertEquals("Should be 89", expectedResult, max);
}
@Test
public void whenListIsOfPersonObjectThenMinCanBeDoneUsingCustomComparatorThroughLambda() {
//given
final Person alex = new Person("Alex", 23);
final Person john = new Person("John", 40);
final Person peter = new Person("Peter", 32);
final List<Person> people = Arrays.asList(alex, john, peter);
//then
final Person minByAge = people
.stream()
.min(Comparator.comparing(Person::getAge))
.orElseThrow(NoSuchElementException::new);
assertEquals("Should be Alex", alex, minByAge);
}
}
core-java-8/src/test/java/com/baeldung/java8/Java8MethodReferenceUnitTest.java
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package com.baeldung.java8;
import com.baeldung.java_8_features.User;
import org.junit.Before;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
public class Java8MethodReferenceUnitTest {
private List<String> list;
@Before
public void init() {
list = new ArrayList<>();
list.add("One");
list.add("OneAndOnly");
list.add("Derek");
list.add("Change");
list.add("factory");
list.add("justBefore");
list.add("Italy");
list.add("Italy");
list.add("Thursday");
list.add("");
list.add("");
}
@Test
public void checkStaticMethodReferences_whenWork_thenCorrect() {
List<User> users = new ArrayList<>();
users.add(new User());
users.add(new User());
boolean isReal = users.stream().anyMatch(u -> User.isRealUser(u));
boolean isRealRef = users.stream().anyMatch(User::isRealUser);
assertTrue(isReal);
assertTrue(isRealRef);
}
@Test
public void checkInstanceMethodReferences_whenWork_thenCorrect() {
User user = new User();
boolean isLegalName = list.stream().anyMatch(user::isLegalName);
assertTrue(isLegalName);
}
@Test
public void checkParticularTypeReferences_whenWork_thenCorrect() {
long count = list.stream().filter(String::isEmpty).count();
assertEquals(count, 2);
}
@Test
public void checkConstructorReferences_whenWork_thenCorrect() {
Stream<User> stream = list.stream().map(User::new);
List<User> userList = stream.collect(Collectors.toList());
assertEquals(userList.size(), list.size());
assertTrue(userList.get(0) instanceof User);
}
}
core-java-8/src/test/java/com/baeldung/java8/Java8OptionalUnitTest.java
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package com.baeldung.java8;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import org.junit.Before;
import org.junit.Test;
import com.baeldung.java_8_features.Address;
import com.baeldung.java_8_features.CustomException;
import com.baeldung.java_8_features.OptionalAddress;
import com.baeldung.java_8_features.OptionalUser;
import com.baeldung.java_8_features.User;
public class Java8OptionalUnitTest {
private List<String> list;
@Before
public void init() {
list = new ArrayList<>();
list.add("One");
list.add("OneAndOnly");
list.add("Derek");
list.add("Change");
list.add("factory");
list.add("justBefore");
list.add("Italy");
list.add("Italy");
list.add("Thursday");
list.add("");
list.add("");
}
@Test
public void checkOptional_whenAsExpected_thenCorrect() {
Optional<String> optionalEmpty = Optional.empty();
assertFalse(optionalEmpty.isPresent());
String str = "value";
Optional<String> optional = Optional.of(str);
assertEquals(optional.get(), "value");
Optional<String> optionalNullable = Optional.ofNullable(str);
Optional<String> optionalNull = Optional.ofNullable(null);
assertEquals(optionalNullable.get(), "value");
assertFalse(optionalNull.isPresent());
List<String> listOpt = Optional.of(list).orElse(new ArrayList<>());
List<String> listNull = null;
List<String> listOptNull = Optional.ofNullable(listNull).orElse(new ArrayList<>());
assertTrue(listOpt == list);
assertTrue(listOptNull.isEmpty());
Optional<User> user = Optional.ofNullable(getUser());
String result = user.map(User::getAddress).map(Address::getStreet).orElse("not specified");
assertEquals(result, "1st Avenue");
Optional<OptionalUser> optionalUser = Optional.ofNullable(getOptionalUser());
String resultOpt = optionalUser.flatMap(OptionalUser::getAddress).flatMap(OptionalAddress::getStreet).orElse("not specified");
assertEquals(resultOpt, "1st Avenue");
Optional<User> userNull = Optional.ofNullable(getUserNull());
String resultNull = userNull.map(User::getAddress).map(Address::getStreet).orElse("not specified");
assertEquals(resultNull, "not specified");
Optional<OptionalUser> optionalUserNull = Optional.ofNullable(getOptionalUserNull());
String resultOptNull = optionalUserNull.flatMap(OptionalUser::getAddress).flatMap(OptionalAddress::getStreet).orElse("not specified");
assertEquals(resultOptNull, "not specified");
}
@Test(expected = CustomException.class)
public void callMethod_whenCustomException_thenCorrect() {
User user = new User();
String result = user.getOrThrow();
}
private User getUser() {
User user = new User();
Address address = new Address();
address.setStreet("1st Avenue");
user.setAddress(address);
return user;
}
private OptionalUser getOptionalUser() {
OptionalUser user = new OptionalUser();
OptionalAddress address = new OptionalAddress();
address.setStreet("1st Avenue");
user.setAddress(address);
return user;
}
private OptionalUser getOptionalUserNull() {
OptionalUser user = new OptionalUser();
OptionalAddress address = new OptionalAddress();
address.setStreet(null);
user.setAddress(address);
return user;
}
private User getUserNull() {
User user = new User();
Address address = new Address();
address.setStreet(null);
user.setAddress(address);
return user;
}
}
core-java-8/src/test/java/com/baeldung/java8/Java8SortUnitTest.java
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package com.baeldung.java8;
import com.baeldung.java8.entity.Human;
import com.google.common.collect.Lists;
import com.google.common.primitives.Ints;
import org.junit.Assert;
import org.junit.Test;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import static org.hamcrest.Matchers.equalTo;
public class Java8SortUnitTest {
// tests -
@Test
public final void givenPreLambda_whenSortingEntitiesByName_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
Collections.sort(humans, new Comparator<Human>() {
@Override
public final int compare(final Human h1, final Human h2) {
return h1.getName().compareTo(h2.getName());
}
});
Assert.assertThat(humans.get(0), equalTo(new Human("Jack", 12)));
}
@Test
public final void whenSortingEntitiesByName_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
humans.sort((final Human h1, final Human h2) -> h1.getName().compareTo(h2.getName()));
Assert.assertThat(humans.get(0), equalTo(new Human("Jack", 12)));
}
@Test
public final void givenLambdaShortForm_whenSortingEntitiesByName_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
humans.sort((h1, h2) -> h1.getName().compareTo(h2.getName()));
Assert.assertThat(humans.get(0), equalTo(new Human("Jack", 12)));
}
@Test
public final void whenSortingEntitiesByNameThenAge_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 12), new Human("Sarah", 10), new Human("Zack", 12));
humans.sort((lhs, rhs) -> {
if (lhs.getName().equals(rhs.getName())) {
return lhs.getAge() - rhs.getAge();
} else {
return lhs.getName().compareTo(rhs.getName());
}
});
Assert.assertThat(humans.get(0), equalTo(new Human("Sarah", 10)));
}
@Test
public final void givenCompositionVerbose_whenSortingEntitiesByNameThenAge_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 12), new Human("Sarah", 10), new Human("Zack", 12));
final Comparator<Human> byName = (h1, h2) -> h1.getName().compareTo(h2.getName());
final Comparator<Human> byAge = (h1, h2) -> Ints.compare(h1.getAge(), h2.getAge());
humans.sort(byName.thenComparing(byAge));
Assert.assertThat(humans.get(0), equalTo(new Human("Sarah", 10)));
}
@Test
public final void givenComposition_whenSortingEntitiesByNameThenAge_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 12), new Human("Sarah", 10), new Human("Zack", 12));
humans.sort(Comparator.comparing(Human::getName).thenComparing(Human::getAge));
Assert.assertThat(humans.get(0), equalTo(new Human("Sarah", 10)));
}
@Test
public final void whenSortingEntitiesByAge_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
humans.sort((h1, h2) -> Ints.compare(h1.getAge(), h2.getAge()));
Assert.assertThat(humans.get(0), equalTo(new Human("Sarah", 10)));
}
@Test
public final void whenSortingEntitiesByNameReversed_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
final Comparator<Human> comparator = (h1, h2) -> h1.getName().compareTo(h2.getName());
humans.sort(comparator.reversed());
Assert.assertThat(humans.get(0), equalTo(new Human("Sarah", 10)));
}
@Test
public final void givenMethodDefinition_whenSortingEntitiesByNameThenAge_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
humans.sort(Human::compareByNameThenAge);
Assert.assertThat(humans.get(0), equalTo(new Human("Jack", 12)));
}
@Test
public final void givenInstanceMethod_whenSortingEntitiesByName_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
humans.sort(Comparator.comparing(Human::getName));
Assert.assertThat(humans.get(0), equalTo(new Human("Jack", 12)));
}
}
core-java-8/src/test/java/com/baeldung/java8/Java8StreamApiUnitTest.java
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package com.baeldung.java8;
import com.baeldung.streamApi.Product;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedWriter;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.*;
import java.util.regex.Pattern;
import java.util.stream.*;
import static org.junit.Assert.*;
public class Java8StreamApiUnitTest {
private long counter;
private static Logger log = LoggerFactory.getLogger(Java8StreamApiUnitTest.class);
private List<Product> productList;
@Before
public void init() {
productList = Arrays.asList(new Product(23, "potatoes"), new Product(14, "orange"), new Product(13, "lemon"), new Product(23, "bread"), new Product(13, "sugar"));
}
@Test
public void checkPipeline_whenStreamOneElementShorter_thenCorrect() {
List<String> list = Arrays.asList("abc1", "abc2", "abc3");
long size = list.stream().skip(1).map(element -> element.substring(0, 3)).count();
assertEquals(list.size() - 1, size);
}
@Test
public void checkOrder_whenChangeQuantityOfMethodCalls_thenCorrect() {
List<String> list = Arrays.asList("abc1", "abc2", "abc3");
counter = 0;
long sizeFirst = list.stream().skip(2).map(element -> {
wasCalled();
return element.substring(0, 3);
}).count();
assertEquals(1, counter);
counter = 0;
long sizeSecond = list.stream().map(element -> {
wasCalled();
return element.substring(0, 3);
}).skip(2).count();
assertEquals(3, counter);
}
@Test
public void createEmptyStream_whenEmpty_thenCorrect() {
Stream<String> streamEmpty = Stream.empty();
assertEquals(0, streamEmpty.count());
List<String> names = Collections.emptyList();
Stream<String> streamOf = Product.streamOf(names);
assertTrue(streamOf.count() == 0);
}
@Test
public void createStream_whenCreated_thenCorrect() {
Collection<String> collection = Arrays.asList("a", "b", "c");
Stream<String> streamOfCollection = collection.stream();
assertEquals(3, streamOfCollection.count());
Stream<String> streamOfArray = Stream.of("a", "b", "c");
assertEquals(3, streamOfArray.count());
String[] arr = new String[] { "a", "b", "c" };
Stream<String> streamOfArrayPart = Arrays.stream(arr, 1, 3);
assertEquals(2, streamOfArrayPart.count());
IntStream intStream = IntStream.range(1, 3);
LongStream longStream = LongStream.rangeClosed(1, 3);
Random random = new Random();
DoubleStream doubleStream = random.doubles(3);
assertEquals(2, intStream.count());
assertEquals(3, longStream.count());
assertEquals(3, doubleStream.count());
IntStream streamOfChars = "abc".chars();
IntStream str = "".chars();
assertEquals(3, streamOfChars.count());
Stream<String> streamOfString = Pattern.compile(", ").splitAsStream("a, b, c");
assertEquals("a", streamOfString.findFirst().get());
Path path = getPath();
Stream<String> streamOfStrings = null;
try {
streamOfStrings = Files.lines(path, Charset.forName("UTF-8"));
} catch (IOException e) {
log.error("Error creating streams from paths {}", path, e.getMessage(), e);
}
assertEquals("a", streamOfStrings.findFirst().get());
Stream<String> streamBuilder = Stream.<String> builder().add("a").add("b").add("c").build();
assertEquals(3, streamBuilder.count());
Stream<String> streamGenerated = Stream.generate(() -> "element").limit(10);
assertEquals(10, streamGenerated.count());
Stream<Integer> streamIterated = Stream.iterate(40, n -> n + 2).limit(20);
assertTrue(40 <= streamIterated.findAny().get());
}
@Test
public void runStreamPipeline_whenOrderIsRight_thenCorrect() {
List<String> list = Arrays.asList("abc1", "abc2", "abc3");
Optional<String> stream = list.stream().filter(element -> {
log.info("filter() was called");
return element.contains("2");
}).map(element -> {
log.info("map() was called");
return element.toUpperCase();
}).findFirst();
}
@Test
public void reduce_whenExpected_thenCorrect() {
OptionalInt reduced = IntStream.range(1, 4).reduce((a, b) -> a + b);
assertEquals(6, reduced.getAsInt());
int reducedTwoParams = IntStream.range(1, 4).reduce(10, (a, b) -> a + b);
assertEquals(16, reducedTwoParams);
int reducedThreeParams = Stream.of(1, 2, 3).reduce(10, (a, b) -> a + b, (a, b) -> {
log.info("combiner was called");
return a + b;
});
assertEquals(16, reducedThreeParams);
int reducedThreeParamsParallel = Arrays.asList(1, 2, 3).parallelStream().reduce(10, (a, b) -> a + b, (a, b) -> {
log.info("combiner was called");
return a + b;
});
assertEquals(36, reducedThreeParamsParallel);
}
@Test
public void collecting_whenAsExpected_thenCorrect() {
List<String> collectorCollection = productList.stream().map(Product::getName).collect(Collectors.toList());
assertTrue(collectorCollection instanceof List);
assertEquals(5, collectorCollection.size());
String listToString = productList.stream().map(Product::getName).collect(Collectors.joining(", ", "[", "]"));
assertTrue(listToString.contains(",") && listToString.contains("[") && listToString.contains("]"));
double averagePrice = productList.stream().collect(Collectors.averagingInt(Product::getPrice));
assertTrue(17.2 == averagePrice);
int summingPrice = productList.stream().collect(Collectors.summingInt(Product::getPrice));
assertEquals(86, summingPrice);
IntSummaryStatistics statistics = productList.stream().collect(Collectors.summarizingInt(Product::getPrice));
assertEquals(23, statistics.getMax());
Map<Integer, List<Product>> collectorMapOfLists = productList.stream().collect(Collectors.groupingBy(Product::getPrice));
assertEquals(3, collectorMapOfLists.keySet().size());
Map<Boolean, List<Product>> mapPartioned = productList.stream().collect(Collectors.partitioningBy(element -> element.getPrice() > 15));
assertEquals(2, mapPartioned.keySet().size());
}
@Test(expected = UnsupportedOperationException.class)
public void collect_whenThrows_thenCorrect() {
Set<Product> unmodifiableSet = productList.stream().collect(Collectors.collectingAndThen(Collectors.toSet(), Collections::unmodifiableSet));
unmodifiableSet.add(new Product(4, "tea"));
}
@Test
public void customCollector_whenResultContainsAllElementsFrSource_thenCorrect() {
Collector<Product, ?, LinkedList<Product>> toLinkedList = Collector.of(LinkedList::new, LinkedList::add, (first, second) -> {
first.addAll(second);
return first;
});
LinkedList<Product> linkedListOfPersons = productList.stream().collect(toLinkedList);
assertTrue(linkedListOfPersons.containsAll(productList));
}
@Test
public void parallelStream_whenWorks_thenCorrect() {
Stream<Product> streamOfCollection = productList.parallelStream();
boolean isParallel = streamOfCollection.isParallel();
boolean haveBigPrice = streamOfCollection.map(product -> product.getPrice() * 12).anyMatch(price -> price > 200);
assertTrue(isParallel && haveBigPrice);
}
@Test
public void parallel_whenIsParallel_thenCorrect() {
IntStream intStreamParallel = IntStream.range(1, 150).parallel().map(element -> element * 34);
boolean isParallel = intStreamParallel.isParallel();
assertTrue(isParallel);
}
@Test
public void parallel_whenIsSequential_thenCorrect() {
IntStream intStreamParallel = IntStream.range(1, 150).parallel().map(element -> element * 34);
IntStream intStreamSequential = intStreamParallel.sequential();
boolean isParallel = intStreamParallel.isParallel();
assertFalse(isParallel);
}
private Path getPath() {
Path path = null;
try {
path = Files.createTempFile(null, ".txt");
} catch (IOException e) {
log.error(e.getMessage());
}
try (BufferedWriter writer = Files.newBufferedWriter(path)) {
writer.write("a\nb\nc");
} catch (IOException e) {
log.error(e.getMessage());
}
return path;
}
private void wasCalled() {
counter++;
}
}
core-java-8/src/test/java/com/baeldung/java8/Java8StreamsUnitTest.java
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package com.baeldung.java8;
import com.baeldung.java_8_features.Detail;
import org.junit.Before;
import org.junit.Test;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static org.junit.Assert.*;
public class Java8StreamsUnitTest {
private List<String> list;
@Before
public void init() {
list = new ArrayList<>();
list.add("One");
list.add("OneAndOnly");
list.add("Derek");
list.add("Change");
list.add("factory");
list.add("justBefore");
list.add("Italy");
list.add("Italy");
list.add("Thursday");
list.add("");
list.add("");
}
@Test
public void checkStreamCount_whenCreating_givenDifferentSources() {
String[] arr = new String[] { "a", "b", "c" };
Stream<String> streamArr = Arrays.stream(arr);
assertEquals(streamArr.count(), 3);
Stream<String> streamOf = Stream.of("a", "b", "c");
assertEquals(streamOf.count(), 3);
long count = list.stream().distinct().count();
assertEquals(count, 9);
}
@Test
public void checkStreamCount_whenOperationFilter_thanCorrect() {
Stream<String> streamFilter = list.stream().filter(element -> element.isEmpty());
assertEquals(streamFilter.count(), 2);
}
@Test
public void checkStreamCount_whenOperationMap_thanCorrect() {
List<String> uris = new ArrayList<>();
uris.add("C:\\My.txt");
Stream<Path> streamMap = uris.stream().map(uri -> Paths.get(uri));
assertEquals(streamMap.count(), 1);
List<Detail> details = new ArrayList<>();
details.add(new Detail());
details.add(new Detail());
Stream<String> streamFlatMap = details.stream().flatMap(detail -> detail.getParts().stream());
assertEquals(streamFlatMap.count(), 4);
}
@Test
public void checkStreamCount_whenOperationMatch_thenCorrect() {
boolean isValid = list.stream().anyMatch(element -> element.contains("h"));
boolean isValidOne = list.stream().allMatch(element -> element.contains("h"));
boolean isValidTwo = list.stream().noneMatch(element -> element.contains("h"));
assertTrue(isValid);
assertFalse(isValidOne);
assertFalse(isValidTwo);
}
@Test
public void checkStreamReducedValue_whenOperationReduce_thenCorrect() {
List<Integer> integers = new ArrayList<>();
integers.add(1);
integers.add(1);
integers.add(1);
Integer reduced = integers.stream().reduce(23, (a, b) -> a + b);
assertTrue(reduced == 26);
}
@Test
public void checkStreamContains_whenOperationCollect_thenCorrect() {
List<String> resultList = list.stream().map(element -> element.toUpperCase()).collect(Collectors.toList());
assertEquals(resultList.size(), list.size());
assertTrue(resultList.contains(""));
}
@Test
public void checkParallelStream_whenDoWork() {
list.parallelStream().forEach(element -> doWork(element));
}
private void doWork(String string) {
assertTrue(true); // just imitate an amount of work
}
}
core-java-8/src/test/java/com/baeldung/java8/base64/ApacheCommonsEncodeDecodeUnitTest.java
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package com.baeldung.java8.base64;
import org.apache.commons.codec.binary.Base64;
import org.junit.Test;
import java.io.UnsupportedEncodingException;
import static org.junit.Assert.*;
public class ApacheCommonsEncodeDecodeUnitTest {
// tests
@Test
public void whenStringIsEncoded() throws UnsupportedEncodingException {
final String originalInput = "test input";
final Base64 base64 = new Base64();
final String encodedString = new String(base64.encode(originalInput.getBytes()));
assertNotNull(encodedString);
assertNotEquals(originalInput, encodedString);
}
@Test
public void whenStringIsEncoded_thenStringCanBeDecoded() throws UnsupportedEncodingException {
final String originalInput = "test input";
final Base64 base64 = new Base64();
final String encodedString = new String(base64.encode(originalInput.getBytes()));
final String decodedString = new String(base64.decode(encodedString.getBytes()));
assertNotNull(decodedString);
assertEquals(originalInput, decodedString);
}
@Test
public void whenStringIsEncodedUsingStaticMethod() throws UnsupportedEncodingException {
final String originalInput = "test input";
final String encodedString = new String(Base64.encodeBase64(originalInput.getBytes()));
assertNotNull(encodedString);
assertNotEquals(originalInput, encodedString);
}
@Test
public void whenStringIsEncodedUsingStaticMethod_thenStringCanBeDecodedUsingStaticMethod() throws UnsupportedEncodingException {
final String originalInput = "test input";
final String encodedString = new String(Base64.encodeBase64(originalInput.getBytes()));
final String decodedString = new String(Base64.decodeBase64(encodedString.getBytes()));
assertNotNull(decodedString);
assertEquals(originalInput, decodedString);
}
}
core-java-8/src/test/java/com/baeldung/java8/base64/Java8EncodeDecodeUnitTest.java
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package com.baeldung.java8.base64;
import org.junit.Test;
import java.io.UnsupportedEncodingException;
import java.util.Base64;
import java.util.UUID;
import static org.junit.Assert.*;
public class Java8EncodeDecodeUnitTest {
// tests
@Test
public void whenStringIsEncoded_thenOk() throws UnsupportedEncodingException {
final String originalInput = "test input";
final String encodedString = Base64.getEncoder().encodeToString(originalInput.getBytes());
assertNotNull(encodedString);
assertNotEquals(originalInput, encodedString);
}
@Test
public void whenStringIsEncoded_thenStringCanBeDecoded() throws UnsupportedEncodingException {
final String originalInput = "test input";
final String encodedString = Base64.getEncoder().encodeToString(originalInput.getBytes());
final byte[] decodedBytes = Base64.getDecoder().decode(encodedString);
final String decodedString = new String(decodedBytes);
assertNotNull(decodedString);
assertEquals(originalInput, decodedString);
}
@Test
public void whenStringIsEncodedWithoutPadding_thenOk() throws UnsupportedEncodingException {
final String originalInput = "test input";
final String encodedString = Base64.getEncoder().withoutPadding().encodeToString(originalInput.getBytes());
assertNotNull(encodedString);
assertNotEquals(originalInput, encodedString);
}
@Test
public void whenStringIsEncodedWithoutPadding_thenStringCanBeDecoded() throws UnsupportedEncodingException {
final String originalInput = "test input";
final String encodedString = Base64.getEncoder().withoutPadding().encodeToString(originalInput.getBytes());
final byte[] decodedBytes = Base64.getDecoder().decode(encodedString);
final String decodedString = new String(decodedBytes);
assertNotNull(decodedString);
assertEquals(originalInput, decodedString);
}
@Test
public void whenUrlIsEncoded_thenOk() throws UnsupportedEncodingException {
final String originalUrl = "https://www.google.co.nz/?gfe_rd=cr&ei=dzbFVf&gws_rd=ssl#q=java";
final String encodedUrl = Base64.getUrlEncoder().encodeToString(originalUrl.getBytes());
assertNotNull(encodedUrl);
assertNotEquals(originalUrl, encodedUrl);
}
@Test
public void whenUrlIsEncoded_thenURLCanBeDecoded() throws UnsupportedEncodingException {
final String originalUrl = "https://www.google.co.nz/?gfe_rd=cr&ei=dzbFVf&gws_rd=ssl#q=java";
final String encodedUrl = Base64.getUrlEncoder().encodeToString(originalUrl.getBytes());
final byte[] decodedBytes = Base64.getUrlDecoder().decode(encodedUrl.getBytes());
final String decodedUrl = new String(decodedBytes);
assertNotNull(decodedUrl);
assertEquals(originalUrl, decodedUrl);
}
@Test
public void whenMimeIsEncoded_thenOk() throws UnsupportedEncodingException {
final StringBuilder buffer = getMimeBuffer();
final byte[] forEncode = buffer.toString().getBytes();
final String encodedMime = Base64.getMimeEncoder().encodeToString(forEncode);
assertNotNull(encodedMime);
}
@Test
public void whenMimeIsEncoded_thenItCanBeDecoded() throws UnsupportedEncodingException {
final StringBuilder buffer = getMimeBuffer();
final byte[] forEncode = buffer.toString().getBytes();
final String encodedMime = Base64.getMimeEncoder().encodeToString(forEncode);
final byte[] decodedBytes = Base64.getMimeDecoder().decode(encodedMime);
final String decodedMime = new String(decodedBytes);
assertNotNull(decodedMime);
}
//
private static StringBuilder getMimeBuffer() {
final StringBuilder buffer = new StringBuilder();
for (int count = 0; count < 10; ++count) {
buffer.append(UUID.randomUUID().toString());
}
return buffer;
}
}
core-java-8/src/test/java/com/baeldung/java8/comparator/Employee.java
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package com.baeldung.java8.comparator;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.ToString;
@Data
@AllArgsConstructor
@ToString
@EqualsAndHashCode
public class Employee implements Comparable<Employee>{
String name;
int age;
double salary;
long mobile;
@Override
public int compareTo(Employee argEmployee) {
return name.compareTo(argEmployee.getName());
}
}
core-java-8/src/test/java/com/baeldung/java8/comparator/Java8ComparatorUnitTest.java
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package com.baeldung.java8.comparator;
import java.util.Arrays;
import java.util.Comparator;
import org.junit.Before;
import org.junit.Test;
import lombok.Data;
import static org.junit.Assert.assertTrue;
public class Java8ComparatorUnitTest {
private Employee[] employees;
private Employee[] employeesArrayWithNulls;
private Employee[] sortedEmployeesByName;
private Employee[] sortedEmployeesByNameDesc;
private Employee[] sortedEmployeesByAge;
private Employee[] sortedEmployeesByMobile;
private Employee[] sortedEmployeesBySalary;
private Employee[] sortedEmployeesArray_WithNullsFirst;
private Employee[] sortedEmployeesArray_WithNullsLast;
private Employee[] sortedEmployeesByNameAge;
private Employee[] someMoreEmployees;
private Employee[] sortedEmployeesByAgeName;;
@Before
public void initData() {
employees = new Employee[] { new Employee("John", 25, 3000, 9922001), new Employee("Ace", 22, 2000, 5924001), new Employee("Keith", 35, 4000, 3924401) };
employeesArrayWithNulls = new Employee[] { new Employee("John", 25, 3000, 9922001), null, new Employee("Ace", 22, 2000, 5924001), null, new Employee("Keith", 35, 4000, 3924401) };
sortedEmployeesByName = new Employee[] { new Employee("Ace", 22, 2000, 5924001), new Employee("John", 25, 3000, 9922001), new Employee("Keith", 35, 4000, 3924401) };
sortedEmployeesByNameDesc = new Employee[] { new Employee("Keith", 35, 4000, 3924401), new Employee("John", 25, 3000, 9922001), new Employee("Ace", 22, 2000, 5924001) };
sortedEmployeesByAge = new Employee[] { new Employee("Ace", 22, 2000, 5924001), new Employee("John", 25, 3000, 9922001), new Employee("Keith", 35, 4000, 3924401) };
sortedEmployeesByMobile = new Employee[] { new Employee("Keith", 35, 4000, 3924401), new Employee("Ace", 22, 2000, 5924001), new Employee("John", 25, 3000, 9922001), };
sortedEmployeesBySalary = new Employee[] { new Employee("Ace", 22, 2000, 5924001), new Employee("John", 25, 3000, 9922001), new Employee("Keith", 35, 4000, 3924401), };
sortedEmployeesArray_WithNullsFirst = new Employee[] { null, null, new Employee("Ace", 22, 2000, 5924001), new Employee("John", 25, 3000, 9922001), new Employee("Keith", 35, 4000, 3924401) };
sortedEmployeesArray_WithNullsLast = new Employee[] { new Employee("Ace", 22, 2000, 5924001), new Employee("John", 25, 3000, 9922001), new Employee("Keith", 35, 4000, 3924401), null, null };
someMoreEmployees = new Employee[] { new Employee("Jake", 25, 3000, 9922001), new Employee("Jake", 22, 2000, 5924001), new Employee("Ace", 22, 3000, 6423001), new Employee("Keith", 35, 4000, 3924401) };
sortedEmployeesByAgeName = new Employee[] { new Employee("Ace", 22, 3000, 6423001), new Employee("Jake", 22, 2000, 5924001), new Employee("Jake", 25, 3000, 9922001), new Employee("Keith", 35, 4000, 3924401) };
sortedEmployeesByNameAge = new Employee[] { new Employee("Ace", 22, 3000, 6423001), new Employee("Jake", 22, 2000, 5924001), new Employee("Jake", 25, 3000, 9922001), new Employee("Keith", 35, 4000, 3924401) };
}
@Test
public void whenComparing_thenSortedByName() {
Comparator<Employee> employeeNameComparator = Comparator.comparing(Employee::getName);
Arrays.sort(employees, employeeNameComparator);
// System.out.println(Arrays.toString(employees));
assertTrue(Arrays.equals(employees, sortedEmployeesByName));
}
@Test
public void whenComparingWithComparator_thenSortedByNameDesc() {
Comparator<Employee> employeeNameComparator = Comparator.comparing(Employee::getName, (s1, s2) -> {
return s2.compareTo(s1);
});
Arrays.sort(employees, employeeNameComparator);
// System.out.println(Arrays.toString(employees));
assertTrue(Arrays.equals(employees, sortedEmployeesByNameDesc));
}
@Test
public void whenReversed_thenSortedByNameDesc() {
Comparator<Employee> employeeNameComparator = Comparator.comparing(Employee::getName);
Comparator<Employee> employeeNameComparatorReversed = employeeNameComparator.reversed();
Arrays.sort(employees, employeeNameComparatorReversed);
// System.out.println(Arrays.toString(employees));
assertTrue(Arrays.equals(employees, sortedEmployeesByNameDesc));
}
@Test
public void whenComparingInt_thenSortedByAge() {
Comparator<Employee> employeeAgeComparator = Comparator.comparingInt(Employee::getAge);
Arrays.sort(employees, employeeAgeComparator);
// System.out.println(Arrays.toString(employees));
assertTrue(Arrays.equals(employees, sortedEmployeesByAge));
}
@Test
public void whenComparingLong_thenSortedByMobile() {
Comparator<Employee> employeeMobileComparator = Comparator.comparingLong(Employee::getMobile);
Arrays.sort(employees, employeeMobileComparator);
// System.out.println(Arrays.toString(employees));
assertTrue(Arrays.equals(employees, sortedEmployeesByMobile));
}
@Test
public void whenComparingDouble_thenSortedBySalary() {
Comparator<Employee> employeeSalaryComparator = Comparator.comparingDouble(Employee::getSalary);
Arrays.sort(employees, employeeSalaryComparator);
// System.out.println(Arrays.toString(employees));
assertTrue(Arrays.equals(employees, sortedEmployeesBySalary));
}
@Test
public void whenNaturalOrder_thenSortedByName() {
Comparator<Employee> employeeNameComparator = Comparator.<Employee> naturalOrder();
Arrays.sort(employees, employeeNameComparator);
// System.out.println(Arrays.toString(employees));
assertTrue(Arrays.equals(employees, sortedEmployeesByName));
}
@Test
public void whenReverseOrder_thenSortedByNameDesc() {
Comparator<Employee> employeeNameComparator = Comparator.<Employee> reverseOrder();
Arrays.sort(employees, employeeNameComparator);
// System.out.println(Arrays.toString(employees));
assertTrue(Arrays.equals(employees, sortedEmployeesByNameDesc));
}
@Test
public void whenNullsFirst_thenSortedByNameWithNullsFirst() {
Comparator<Employee> employeeNameComparator = Comparator.comparing(Employee::getName);
Comparator<Employee> employeeNameComparator_nullFirst = Comparator.nullsFirst(employeeNameComparator);
Arrays.sort(employeesArrayWithNulls, employeeNameComparator_nullFirst);
// System.out.println(Arrays.toString(employeesArrayWithNulls));
assertTrue(Arrays.equals(employeesArrayWithNulls, sortedEmployeesArray_WithNullsFirst));
}
@Test
public void whenNullsLast_thenSortedByNameWithNullsLast() {
Comparator<Employee> employeeNameComparator = Comparator.comparing(Employee::getName);
Comparator<Employee> employeeNameComparator_nullLast = Comparator.nullsLast(employeeNameComparator);
Arrays.sort(employeesArrayWithNulls, employeeNameComparator_nullLast);
// System.out.println(Arrays.toString(employeesArrayWithNulls));
assertTrue(Arrays.equals(employeesArrayWithNulls, sortedEmployeesArray_WithNullsLast));
}
@Test
public void whenThenComparing_thenSortedByAgeName() {
Comparator<Employee> employee_Age_Name_Comparator = Comparator.comparing(Employee::getAge)
.thenComparing(Employee::getName);
Arrays.sort(someMoreEmployees, employee_Age_Name_Comparator);
// System.out.println(Arrays.toString(someMoreEmployees));
assertTrue(Arrays.equals(someMoreEmployees, sortedEmployeesByAgeName));
}
@Test
public void whenThenComparing_thenSortedByNameAge() {
Comparator<Employee> employee_Name_Age_Comparator = Comparator.comparing(Employee::getName)
.thenComparingInt(Employee::getAge);
Arrays.sort(someMoreEmployees, employee_Name_Age_Comparator);
// System.out.println(Arrays.toString(someMoreEmployees));
assertTrue(Arrays.equals(someMoreEmployees, sortedEmployeesByNameAge));
}
}
core-java-8/src/test/java/com/baeldung/java8/entity/Human.java
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package com.baeldung.java8.entity;
public class Human {
private String name;
private int age;
public Human() {
super();
}
public Human(final String name, final int age) {
super();
this.name = name;
this.age = age;
}
// API
public String getName() {
return name;
}
public void setName(final String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(final int age) {
this.age = age;
}
// compare
public static int compareByNameThenAge(final Human lhs, final Human rhs) {
if (lhs.name.equals(rhs.name)) {
return lhs.age - rhs.age;
} else {
return lhs.name.compareTo(rhs.name);
}
}
//
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + age;
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final Human other = (Human) obj;
if (age != other.age) {
return false;
}
if (name == null) {
if (other.name != null) {
return false;
}
} else if (!name.equals(other.name)) {
return false;
}
return true;
}
@Override
public String toString() {
final StringBuilder builder = new StringBuilder();
builder.append("Human [name=").append(name).append(", age=").append(age).append("]");
return builder.toString();
}
}
core-java-8/src/test/java/com/baeldung/java8/lambda/exceptions/LambdaExceptionWrappersUnitTest.java
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package com.baeldung.java8.lambda.exceptions;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import static com.baeldung.java8.lambda.exceptions.LambdaExceptionWrappers.*;
public class LambdaExceptionWrappersUnitTest {
private static final Logger LOG = LoggerFactory.getLogger(LambdaExceptionWrappersUnitTest.class);
private List<Integer> integers;
@Before
public void init() {
integers = Arrays.asList(3, 9, 7, 0, 10, 20);
}
@Test
public void whenNoExceptionFromLambdaWrapper_thenSuccess() {
integers.forEach(lambdaWrapper(i -> LOG.debug("{}", 50 / i)));
}
@Test
public void whenNoExceptionFromConsumerWrapper_thenSuccess() {
integers.forEach(consumerWrapper(i -> LOG.debug("{}", 50 / i), ArithmeticException.class));
}
@Test(expected = RuntimeException.class)
public void whenExceptionFromThrowingConsumerWrapper_thenSuccess() {
integers.forEach(throwingConsumerWrapper(i -> writeToFile(i)));
}
@Test
public void whenNoExceptionFromHandlingConsumerWrapper_thenSuccess() {
integers.forEach(handlingConsumerWrapper(i -> writeToFile(i), IOException.class));
}
private void writeToFile(Integer i) throws IOException {
if (i == 0) {
throw new IOException(); // mock IOException
}
}
}
core-java-8/src/test/java/com/baeldung/java8/optional/OptionalUnitTest.java
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package com.baeldung.java8.optional;
import com.baeldung.optional.Modem;
import com.baeldung.optional.Person;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Arrays;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Optional;
import static org.junit.Assert.*;
public class OptionalUnitTest {
private static final Logger LOG = LoggerFactory.getLogger(OptionalUnitTest.class);
// creating Optional
@Test
public void whenCreatesEmptyOptional_thenCorrect() {
Optional<String> empty = Optional.empty();
assertFalse(empty.isPresent());
}
@Test
public void givenNonNull_whenCreatesNonNullable_thenCorrect() {
String name = "baeldung";
Optional.of(name);
}
@Test(expected = NullPointerException.class)
public void givenNull_whenThrowsErrorOnCreate_thenCorrect() {
String name = null;
Optional<String> opt = Optional.of(name);
}
@Test
public void givenNonNull_whenCreatesOptional_thenCorrect() {
String name = "baeldung";
Optional<String> opt = Optional.of(name);
assertEquals("Optional[baeldung]", opt.toString());
}
@Test
public void givenNonNull_whenCreatesNullable_thenCorrect() {
String name = "baeldung";
Optional<String> opt = Optional.ofNullable(name);
assertEquals("Optional[baeldung]", opt.toString());
}
@Test
public void givenNull_whenCreatesNullable_thenCorrect() {
String name = null;
Optional<String> opt = Optional.ofNullable(name);
assertEquals("Optional.empty", opt.toString());
}
// Checking Value With isPresent()
@Test
public void givenOptional_whenIsPresentWorks_thenCorrect() {
Optional<String> opt = Optional.of("Baeldung");
assertTrue(opt.isPresent());
opt = Optional.ofNullable(null);
assertFalse(opt.isPresent());
}
// Condition Action With ifPresent()
@Test
public void givenOptional_whenIfPresentWorks_thenCorrect() {
Optional<String> opt = Optional.of("baeldung");
opt.ifPresent(name -> LOG.debug("{}", name.length()));
}
// returning Value With get()
@Test
public void givenOptional_whenGetsValue_thenCorrect() {
Optional<String> opt = Optional.of("baeldung");
String name = opt.get();
assertEquals("baeldung", name);
}
@Test(expected = NoSuchElementException.class)
public void givenOptionalWithNull_whenGetThrowsException_thenCorrect() {
Optional<String> opt = Optional.ofNullable(null);
String name = opt.get();
}
// Conditional Return With filter()
@Test
public void whenOptionalFilterWorks_thenCorrect() {
Integer year = 2016;
Optional<Integer> yearOptional = Optional.of(year);
boolean is2016 = yearOptional.filter(y -> y == 2016)
.isPresent();
assertTrue(is2016);
boolean is2017 = yearOptional.filter(y -> y == 2017)
.isPresent();
assertFalse(is2017);
}
@Test
public void whenFiltersWithoutOptional_thenCorrect() {
assertTrue(priceIsInRange1(new Modem(10.0)));
assertFalse(priceIsInRange1(new Modem(9.9)));
assertFalse(priceIsInRange1(new Modem(null)));
assertFalse(priceIsInRange1(new Modem(15.5)));
assertFalse(priceIsInRange1(null));
}
@Test
public void whenFiltersWithOptional_thenCorrect() {
assertTrue(priceIsInRange2(new Modem(10.0)));
assertFalse(priceIsInRange2(new Modem(9.9)));
assertFalse(priceIsInRange2(new Modem(null)));
assertFalse(priceIsInRange2(new Modem(15.5)));
assertFalse(priceIsInRange1(null));
}
public boolean priceIsInRange1(Modem modem) {
boolean isInRange = false;
if (modem != null && modem.getPrice() != null && (modem.getPrice() >= 10 && modem.getPrice() <= 15)) {
isInRange = true;
}
return isInRange;
}
public boolean priceIsInRange2(Modem modem2) {
return Optional.ofNullable(modem2)
.map(Modem::getPrice)
.filter(p -> p >= 10)
.filter(p -> p <= 15)
.isPresent();
}
// Transforming Value With map()
@Test
public void givenOptional_whenMapWorks_thenCorrect() {
List<String> companyNames = Arrays.asList("paypal", "oracle", "", "microsoft", "", "apple");
Optional<List<String>> listOptional = Optional.of(companyNames);
int size = listOptional.map(List::size)
.orElse(0);
assertEquals(6, size);
}
@Test
public void givenOptional_whenMapWorks_thenCorrect2() {
String name = "baeldung";
Optional<String> nameOptional = Optional.of(name);
int len = nameOptional.map(String::length)
.orElse(0);
assertEquals(8, len);
}
@Test
public void givenOptional_whenMapWorksWithFilter_thenCorrect() {
String password = " password ";
Optional<String> passOpt = Optional.of(password);
boolean correctPassword = passOpt.filter(pass -> pass.equals("password"))
.isPresent();
assertFalse(correctPassword);
correctPassword = passOpt.map(String::trim)
.filter(pass -> pass.equals("password"))
.isPresent();
assertTrue(correctPassword);
}
// Transforming Value With flatMap()
@Test
public void givenOptional_whenFlatMapWorks_thenCorrect2() {
Person person = new Person("john", 26);
Optional<Person> personOptional = Optional.of(person);
Optional<Optional<String>> nameOptionalWrapper = personOptional.map(Person::getName);
Optional<String> nameOptional = nameOptionalWrapper.orElseThrow(IllegalArgumentException::new);
String name1 = nameOptional.orElseThrow(IllegalArgumentException::new);
assertEquals("john", name1);
String name = personOptional.flatMap(Person::getName)
.orElseThrow(IllegalArgumentException::new);
assertEquals("john", name);
}
@Test
public void givenOptional_whenFlatMapWorksWithFilter_thenCorrect() {
Person person = new Person("john", 26);
person.setPassword("password");
Optional<Person> personOptional = Optional.of(person);
String password = personOptional.flatMap(Person::getPassword)
.filter(cleanPass -> cleanPass.equals("password"))
.orElseThrow(IllegalArgumentException::new);
assertEquals("password", password);
}
// Default Value With orElse
@Test
public void whenOrElseWorks_thenCorrect() {
String nullName = null;
String name = Optional.ofNullable(nullName)
.orElse("john");
assertEquals("john", name);
}
// Default Value With orElseGet
@Test
public void whenOrElseGetWorks_thenCorrect() {
String nullName = null;
String name = Optional.ofNullable(nullName)
.orElseGet(() -> "john");
assertEquals("john", name);
}
@Test
public void whenOrElseGetAndOrElseOverlap_thenCorrect() {
String text = null;
LOG.debug("Using orElseGet:");
String defaultText = Optional.ofNullable(text)
.orElseGet(this::getMyDefault);
assertEquals("Default Value", defaultText);
LOG.debug("Using orElse:");
defaultText = Optional.ofNullable(text)
.orElse(getMyDefault());
assertEquals("Default Value", defaultText);
}
@Test
public void whenOrElseGetAndOrElseDiffer_thenCorrect() {
String text = "Text present";
LOG.debug("Using orElseGet:");
String defaultText = Optional.ofNullable(text)
.orElseGet(this::getMyDefault);
assertEquals("Text present", defaultText);
LOG.debug("Using orElse:");
defaultText = Optional.ofNullable(text)
.orElse(getMyDefault());
assertEquals("Text present", defaultText);
}
// Exceptions With orElseThrow
@Test(expected = IllegalArgumentException.class)
public void whenOrElseThrowWorks_thenCorrect() {
String nullName = null;
String name = Optional.ofNullable(nullName)
.orElseThrow(IllegalArgumentException::new);
}
public String getMyDefault() {
LOG.debug("Getting default value...");
return "Default Value";
}
}
core-java-8/src/test/java/com/baeldung/strategy/StrategyDesignPatternUnitTest.java
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package com.baeldung.strategy;
import org.junit.Test;
import java.math.BigDecimal;
import java.util.Arrays;
import java.util.List;
import java.util.function.Function;
import static com.baeldung.strategy.Discounter.christmas;
import static com.baeldung.strategy.Discounter.easter;
import static com.baeldung.strategy.Discounter.newYear;
import static org.assertj.core.api.Assertions.assertThat;
public class StrategyDesignPatternUnitTest {
@Test
public void shouldDivideByTwo_WhenApplyingStaffDiscounter() {
Discounter staffDiscounter = new EasterDiscounter();
final BigDecimal discountedValue = staffDiscounter
.apply(BigDecimal.valueOf(100));
assertThat(discountedValue)
.isEqualByComparingTo(BigDecimal.valueOf(50));
}
@Test
public void shouldDivideByTwo_WhenApplyingStaffDiscounterWithAnonyousTypes() {
Discounter staffDiscounter = new Discounter() {
@Override
public BigDecimal apply(BigDecimal amount) {
return amount.multiply(BigDecimal.valueOf(0.5));
}
};
final BigDecimal discountedValue = staffDiscounter
.apply(BigDecimal.valueOf(100));
assertThat(discountedValue)
.isEqualByComparingTo(BigDecimal.valueOf(50));
}
@Test
public void shouldDivideByTwo_WhenApplyingStaffDiscounterWithLamda() {
Discounter staffDiscounter = amount -> amount.multiply(BigDecimal.valueOf(0.5));
final BigDecimal discountedValue = staffDiscounter
.apply(BigDecimal.valueOf(100));
assertThat(discountedValue)
.isEqualByComparingTo(BigDecimal.valueOf(50));
}
@Test
public void shouldApplyAllDiscounts() {
List<Discounter> discounters = Arrays.asList(christmas(), newYear(), easter());
BigDecimal amount = BigDecimal.valueOf(100);
final Discounter combinedDiscounter = discounters
.stream()
.reduce(v -> v, Discounter::combine);
combinedDiscounter.apply(amount);
}
@Test
public void shouldChainDiscounters() {
final Function<BigDecimal, BigDecimal> combinedDiscounters = Discounter
.christmas()
.andThen(newYear());
combinedDiscounters.apply(BigDecimal.valueOf(100));
}
}
core-java-8/src/test/java/com/baeldung/stream/InfiniteStreamUnitTest.java
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package com.baeldung.stream;
import org.junit.Test;
import java.util.Arrays;
import java.util.List;
import java.util.UUID;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static org.junit.Assert.assertEquals;
public class InfiniteStreamUnitTest {
@Test
public void givenInfiniteStream_whenUseIntermediateLimitMethod_thenShouldTerminateInFiniteTime() {
//given
Stream<Integer> infiniteStream = Stream.iterate(0, i -> i + 2);
//when
List<Integer> collect = infiniteStream
.limit(10)
.collect(Collectors.toList());
//then
assertEquals(collect, Arrays.asList(0, 2, 4, 6, 8, 10, 12, 14, 16, 18));
}
@Test
public void givenInfiniteStreamOfRandomInts_whenUseLimit_shouldTerminateInFiniteTime() {
//given
Supplier<UUID> randomUUIDSupplier = UUID::randomUUID;
Stream<UUID> infiniteStreamOfRandomUUID = Stream.generate(randomUUIDSupplier);
//when
List<UUID> randomInts = infiniteStreamOfRandomUUID
.skip(10)
.limit(10)
.collect(Collectors.toList());
//then
assertEquals(randomInts.size(), 10);
}
}
core-java-8/src/test/java/com/baeldung/stream/StreamAddUnitTest.java
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package com.baeldung.stream;
import org.junit.Test;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static org.junit.Assert.assertEquals;
public class StreamAddUnitTest {
@Test
public void givenStream_whenAppendingObject_thenAppended() {
Stream<String> anStream = Stream.of("a", "b", "c", "d", "e");
Stream<String> newStream = Stream.concat(anStream, Stream.of("A"));
List<String> resultList = newStream.collect(Collectors.toList());
assertEquals(resultList.get(resultList.size() - 1), "A");
}
@Test
public void givenStream_whenPrependingObject_thenPrepended() {
Stream<Integer> anStream = Stream.of(1, 2, 3, 4, 5);
Stream<Integer> newStream = Stream.concat(Stream.of(99), anStream);
assertEquals(newStream.findFirst()
.get(), (Integer) 99);
}
@Test
public void givenStream_whenInsertingObject_thenInserted() {
Stream<Double> anStream = Stream.of(1.1, 2.2, 3.3);
Stream<Double> newStream = insertInStream(anStream, 9.9, 3);
List<Double> resultList = newStream.collect(Collectors.toList());
assertEquals(resultList.get(3), (Double) 9.9);
}
private <T> Stream<T> insertInStream(Stream<T> stream, T elem, int index) {
List<T> result = stream.collect(Collectors.toList());
result.add(index, elem);
return result.stream();
}
}
core-java-8/src/test/java/com/baeldung/stream/StreamApiTest.java
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package com.baeldung.stream;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import static org.junit.Assert.assertEquals;
public class StreamApiTest {
@Test
public void givenList_whenGetLastElementUsingReduce_thenReturnLastElement() {
List<String> valueList = new ArrayList<>();
valueList.add("Joe");
valueList.add("John");
valueList.add("Sean");
String last = StreamApi.getLastElementUsingReduce(valueList);
assertEquals("Sean", last);
}
@Test
public void givenInfiniteStream_whenGetInfiniteStreamLastElementUsingReduce_thenReturnLastElement() {
int last = StreamApi.getInfiniteStreamLastElementUsingReduce();
assertEquals(19, last);
}
@Test
public void givenListAndCount_whenGetLastElementUsingSkip_thenReturnLastElement() {
List<String> valueList = new ArrayList<>();
valueList.add("Joe");
valueList.add("John");
valueList.add("Sean");
String last = StreamApi.getLastElementUsingSkip(valueList);
assertEquals("Sean", last);
}
}
core-java-8/src/test/java/com/baeldung/stream/StreamToImmutableTest.java
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package com.baeldung.stream;
import static java.util.stream.Collectors.collectingAndThen;
import static java.util.stream.Collectors.toList;
import static java.util.stream.Collectors.toSet;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.stream.IntStream;
import org.junit.Test;
import com.baeldung.stream.mycollectors.MyImmutableListCollector;
import com.google.common.collect.ImmutableList;
public class StreamToImmutableTest {
@Test
public void whenUsingCollectingToImmutableSet_thenSuccess() {
List<String> givenList = Arrays.asList("a", "b", "c");
List<String> result = givenList.stream()
.collect(collectingAndThen(toSet(), ImmutableList::copyOf));
System.out.println(result.getClass());
}
@Test
public void whenUsingCollectingToUnmodifiableList_thenSuccess() {
List<String> givenList = new ArrayList<>(Arrays.asList("a", "b", "c"));
List<String> result = givenList.stream()
.collect(collectingAndThen(toList(), Collections::unmodifiableList));
System.out.println(result.getClass());
}
@Test
public void whenCollectToImmutableList_thenSuccess() {
List<Integer> list = IntStream.range(0, 9)
.boxed()
.collect(ImmutableList.toImmutableList());
System.out.println(list.getClass());
}
@Test
public void whenCollectToMyImmutableListCollector_thenSuccess() {
List<String> givenList = Arrays.asList("a", "b", "c", "d");
List<String> result = givenList.stream()
.collect(MyImmutableListCollector.toImmutableList());
System.out.println(result.getClass());
}
@Test
public void whenPassingSupplier_thenSuccess() {
List<String> givenList = Arrays.asList("a", "b", "c", "d");
List<String> result = givenList.stream()
.collect(MyImmutableListCollector.toImmutableList(LinkedList::new));
System.out.println(result.getClass());
}
}

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