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Loredana
2019-05-10 23:22:52 +03:00
parent ba8fce515b 01492d1674
commit 6f7ebf8574
1803 changed files with 33727 additions and 6129 deletions
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core-java-modules/core-java-9/.gitignore
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*.class
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear
core-java-modules/core-java-9/README.md
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=========
## Core Java 9 Examples
[Java 9 New Features](http://www.baeldung.com/new-java-9)
### Relevant Articles:
- [Java 9 New Features](https://www.baeldung.com/new-java-9)
- [New Stream Collectors in Java 9](http://www.baeldung.com/java9-stream-collectors)
- [Introduction to Project Jigsaw](http://www.baeldung.com/project-jigsaw-java-modularity)
- [Java 9 Variable Handles Demystified](http://www.baeldung.com/java-variable-handles)
- [Exploring the New HTTP Client in Java 9 and 11](http://www.baeldung.com/java-9-http-client)
- [Method Handles in Java](http://www.baeldung.com/java-method-handles)
- [Introduction to Chronicle Queue](http://www.baeldung.com/java-chronicle-queue)
- [Optional orElse Optional](http://www.baeldung.com/java-optional-or-else-optional)
- [Iterate Through a Range of Dates in Java](https://www.baeldung.com/java-iterate-date-range)
- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
- [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)
- [Multi-Release Jar Files](https://www.baeldung.com/java-multi-release-jar)
- [Ahead of Time Compilation (AoT)](https://www.baeldung.com/ahead-of-time-compilation)
- [Java 9 Process API Improvements](https://www.baeldung.com/java-9-process-api)
- [Guide to java.lang.Process API](https://www.baeldung.com/java-process-api)
- [Java 9 java.util.Objects Additions](https://www.baeldung.com/java-9-objects-new)
- [Java 9 Reactive Streams](https://www.baeldung.com/java-9-reactive-streams)
- [Java 9 Optional API Additions](https://www.baeldung.com/java-9-optional)
- [Java 9 CompletableFuture API Improvements](https://www.baeldung.com/java-9-completablefuture)
- [Introduction to Java 9 StackWalking API](https://www.baeldung.com/java-9-stackwalking-api)
- [Java 9 Convenience Factory Methods for Collections](https://www.baeldung.com/java-9-collections-factory-methods)
- [Java 9 Stream API Improvements](https://www.baeldung.com/java-9-stream-api)
- [A Guide to Java 9 Modularity](https://www.baeldung.com/java-9-modularity)
- [Java 9 Platform Module API](https://www.baeldung.com/java-9-module-api)
- [Java 9 Platform Logging API](https://www.baeldung.com/java-9-logging-api)
core-java-modules/core-java-9/compile-aot.sh
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#!/usr/bin/env bash
cd src/main/java
javac com/baeldung/java9/aot/JaotCompilation.java
jaotc --output jaotCompilation.so com/baeldung/java9/aot/JaotCompilation.class
core-java-modules/core-java-9/compile-httpclient.bat
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javac --module-path mods -d mods/com.baeldung.httpclient^
src/modules/com.baeldung.httpclient/module-info.java^
src/modules/com.baeldung.httpclient/com/baeldung/httpclient/HttpClientExample.java
core-java-modules/core-java-9/compile-modules.sh
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javac -d mods --module-source-path src/modules $(find src/modules -name "*.java")
core-java-modules/core-java-9/compile-simple-modules.sh
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#!/usr/bin/env bash
javac -d outDir --module-source-path src/simple-modules $(find src/simple-modules -name "*.java")
core-java-modules/core-java-9/compile-student-client.bat
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javac --module-path mods -d mods/com.baeldung.student.client^
src/modules/com.baeldung.student.client/module-info.java^
src/modules/com.baeldung.student.client/com/baeldung/student/client/StudentClient.java
core-java-modules/core-java-9/compile-student-model.bat
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javac -d mods/com.baeldung.student.model src/modules/com.baeldung.student.model/module-info.java^
src/modules/com.baeldung.student.model/com/baeldung/student/model/Student.java
core-java-modules/core-java-9/compile-student-service-dbimpl.bat
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javac --module-path mods -d mods/com.baeldung.student.service.dbimpl^
src/modules/com.baeldung.student.service.dbimpl/module-info.java^
src/modules/com.baeldung.student.service.dbimpl/com/baeldung/student/service/dbimpl/StudentDbService.java
core-java-modules/core-java-9/compile-student-service.bat
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javac --module-path mods -d mods/com.baeldung.student.service^
src/modules/com.baeldung.student.service/module-info.java^
src/modules/com.baeldung.student.service/com/baeldung/student/service/StudentService.java
core-java-modules/core-java-9/logging.sh
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# compile logging module
# javac --module-path mods -d mods/com.baeldung.logging src/modules/com.baeldung.logging/module-info.java src/modules/com.baeldung.logging/com/baeldung/logging/*.java
# compile logging slf4j module
javac --module-path mods -d mods/com.baeldung.logging.slf4j src/modules/com.baeldung.logging.slf4j/module-info.java src/modules/com.baeldung.logging.slf4j/com/baeldung/logging/slf4j/*.java
# compile logging main app module
javac --module-path mods -d mods/com.baeldung.logging.app src/modules/com.baeldung.logging.app/module-info.java src/modules/com.baeldung.logging.app/com/baeldung/logging/app/*.java
# run logging main app
# java --module-path mods -m com.baeldung.logging.app/com.baeldung.logging.app.MainApp
# run looging main app using logback
java --module-path mods -Dlogback.configurationFile=mods/logback.xml -m com.baeldung.logging.app/com.baeldung.logging.app.MainApp
core-java-modules/core-java-9/mods/logback.xml
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<pattern>
%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} -- %msg%n
</pattern>
</encoder>
</appender>
<root>
<appender-ref ref="STDOUT"/>
</root>
</configuration>
core-java-modules/core-java-9/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>
<artifactId>core-java-9</artifactId>
<version>0.2-SNAPSHOT</version>
<name>core-java-9</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>com.jayway.awaitility</groupId>
<artifactId>awaitility</artifactId>
<version>${awaitility.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-runner</artifactId>
<version>${junit.platform.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>core-java-9</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
</configuration>
</plugin>
</plugins>
</build>
<pluginRepositories>
<pluginRepository>
<id>apache.snapshots</id>
<url>http://repository.apache.org/snapshots/</url>
</pluginRepository>
</pluginRepositories>
<properties>
<!-- testing -->
<assertj.version>3.10.0</assertj.version>
<junit.platform.version>1.2.0</junit.platform.version>
<awaitility.version>1.7.0</awaitility.version>
<maven.compiler.source>1.9</maven.compiler.source>
<maven.compiler.target>1.9</maven.compiler.target>
<guava.version>25.1-jre</guava.version>
</properties>
</project>
core-java-modules/core-java-9/run-aot.sh
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#!/usr/bin/env bash
cd src/main/java
java -XX:AOTLibrary=./jaotCompilation.so com/baeldung/java9/aot/JaotCompilation
core-java-modules/core-java-9/run-httpclient.bat
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java --module-path mods -m com.baeldung.httpclient/com.baeldung.httpclient.HttpClientExample
core-java-modules/core-java-9/run-simple-module-app.sh
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#!/usr/bin/env bash
java --module-path outDir -m main.app/com.baeldung.modules.main.MainApp
core-java-modules/core-java-9/run-student-client.bat
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java --module-path mods -m com.baeldung.student.client/com.baeldung.student.client.StudentClient
core-java-modules/core-java-9/run-student-client.sh
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java --module-path mods -m com.baeldung.student.client/com.baeldung.student.client.StudentClient
core-java-modules/core-java-9/src/main/java/.gitignore
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*.class
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear
core-java-modules/core-java-9/src/main/java/com/baeldung/java9/aot/JaotCompilation.java
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package com.baeldung.java9.aot;
public class JaotCompilation {
public static void main(String[] argv) {
System.out.println(message());
}
public static String message() {
return "The JAOT compiler says 'Hello'";
}
}
core-java-modules/core-java-9/src/main/java/com/baeldung/java9/language/PrivateInterface.java
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package com.baeldung.java9.language;
public interface PrivateInterface {
private static String staticPrivate() {
return "static private";
}
private String instancePrivate() {
return "instance private";
}
public default void check() {
String result = staticPrivate();
if (!result.equals("static private"))
throw new AssertionError("Incorrect result for static private interface method");
PrivateInterface pvt = new PrivateInterface() {
};
result = pvt.instancePrivate();
if (!result.equals("instance private"))
throw new AssertionError("Incorrect result for instance private interface method");
}
}
core-java-modules/core-java-9/src/main/java/com/baeldung/java9/language/stream/StreamsGroupingCollectionFilter.java
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package com.baeldung.java9.language.stream;
import static java.util.stream.Collectors.filtering;
import static java.util.stream.Collectors.groupingBy;
import static java.util.stream.Collectors.toList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
public class StreamsGroupingCollectionFilter {
static public Map<Integer, List<Integer>> findEvenNumbersAfterGroupingByQuantityOfDigits(Collection<Integer> baseCollection) {
Function<Integer, Integer> getQuantityOfDigits = item -> (int) Math.log10(item) + 1;
return baseCollection.stream()
.collect(groupingBy(getQuantityOfDigits, filtering(item -> item % 2 == 0, toList())));
}
static public Map<Integer, List<Integer>> findEvenNumbersBeforeGroupingByQuantityOfDigits(Collection<Integer> baseCollection) {
return baseCollection.stream()
.filter(item -> item % 2 == 0)
.collect(groupingBy(item -> (int) Math.log10(item) + 1, toList()));
}
}
core-java-modules/core-java-9/src/main/java/com/baeldung/java9/maps/initialize/MapsInitializer.java
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package com.baeldung.java9.maps.initialize;
import java.util.AbstractMap;
import java.util.HashMap;
import java.util.Map;
public class MapsInitializer {
@SuppressWarnings("unused")
public void createMapWithMapOf() {
Map<String, String> emptyMap = Map.of();
Map<String, String> singletonMap = Map.of("key1", "value");
Map<String, String> map = Map.of("key1","value1", "key2", "value2");
}
public void createMapWithMapEntries() {
Map<String, String> map = Map.ofEntries(
new AbstractMap.SimpleEntry<String, String>("name", "John"),
new AbstractMap.SimpleEntry<String, String>("city", "budapest"),
new AbstractMap.SimpleEntry<String, String>("zip", "000000"),
new AbstractMap.SimpleEntry<String, String>("home", "1231231231")
);
}
@SuppressWarnings("unused")
public void createMutableMaps() {
Map<String, String> map = new HashMap<String, String> (Map.of("key1","value1", "key2", "value2"));
Map<String, String> map2 = new HashMap<String, String> ( Map.ofEntries(
new AbstractMap.SimpleEntry<String, String>("name", "John"),
new AbstractMap.SimpleEntry<String, String>("city", "budapest")));
}
}
core-java-modules/core-java-9/src/main/java/com/baeldung/java9/methodhandles/Book.java
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package com.baeldung.java9.methodhandles;
public class Book {
String id;
String title;
public Book(String id, String title) {
this.id = id;
this.title = title;
}
@SuppressWarnings("unused")
private String formatBook() {
return id + " > " + title;
}
}
core-java-modules/core-java-9/src/main/java/com/baeldung/java9/rangedates/DatesCollectionIteration.java
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package com.baeldung.java9.rangedates;
import java.util.Collection;
import java.util.Date;
public class DatesCollectionIteration {
public void iteratingRangeOfDatesJava7(Collection<Date> dates) {
for (Date date : dates) {
processDate(date);
}
}
public void iteratingRangeOfDatesJava8(Collection<Date> dates) {
dates.stream()
.forEach(this::processDate);
}
private void processDate(Date date) {
System.out.println(date);
}
}
core-java-modules/core-java-9/src/main/java/com/baeldung/java9/rangedates/RangeDatesIteration.java
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package com.baeldung.java9.rangedates;
import java.time.LocalDate;
import java.util.Calendar;
import java.util.Date;
public class RangeDatesIteration {
public void iterateBetweenDatesJava9(LocalDate startDate, LocalDate endDate) {
startDate.datesUntil(endDate)
.forEach(this::processDate);
}
public void iterateBetweenDatesJava8(LocalDate start, LocalDate end) {
for (LocalDate date = start; date.isBefore(end); date = date.plusDays(1)) {
processDate(date);
}
}
public void iterateBetweenDatesJava7(Date start, Date end) {
Date current = start;
while (current.before(end)) {
processDate(current);
Calendar calendar = Calendar.getInstance();
calendar.setTime(current);
calendar.add(Calendar.DATE, 1);
current = calendar.getTime();
}
}
private void processDate(LocalDate date) {
System.out.println(date);
}
private void processDate(Date date) {
System.out.println(date);
}
}
core-java-modules/core-java-9/src/main/java/com/baeldung/java9/reactive/BaeldungBatchSubscriberImpl.java
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package com.baeldung.java9.reactive;
import java.util.ArrayList;
import java.util.concurrent.Flow.Subscriber;
import java.util.concurrent.Flow.Subscription;
public class BaeldungBatchSubscriberImpl<T> implements Subscriber<String> {
private Subscription subscription;
private boolean completed = false;
private int counter;
private ArrayList<String> buffer;
public static final int BUFFER_SIZE = 5;
public BaeldungBatchSubscriberImpl() {
buffer = new ArrayList<String>();
}
public boolean isCompleted() {
return completed;
}
public void setCompleted(boolean completed) {
this.completed = completed;
}
public int getCounter() {
return counter;
}
public void setCounter(int counter) {
this.counter = counter;
}
@Override
public void onSubscribe(Subscription subscription) {
this.subscription = subscription;
subscription.request(BUFFER_SIZE);
}
@Override
public void onNext(String item) {
buffer.add(item);
// if buffer is full, process the items.
if (buffer.size() >= BUFFER_SIZE) {
processBuffer();
}
//request more items.
subscription.request(1);
}
private void processBuffer() {
if (buffer.isEmpty())
return;
// Process all items in the buffer. Here, we just print it and sleep for 1 second.
System.out.print("Processed items: ");
buffer.stream()
.forEach(item -> {
System.out.print(" " + item);
});
System.out.println();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
counter = counter + buffer.size();
buffer.clear();
}
@Override
public void onError(Throwable t) {
t.printStackTrace();
}
@Override
public void onComplete() {
completed = true;
// process any remaining items in buffer before
processBuffer();
subscription.cancel();
}
}
core-java-modules/core-java-9/src/main/java/com/baeldung/java9/reactive/BaeldungSubscriberImpl.java
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package com.baeldung.java9.reactive;
import java.util.concurrent.Flow.Subscriber;
import java.util.concurrent.Flow.Subscription;
public class BaeldungSubscriberImpl<T> implements Subscriber<String> {
private Subscription subscription;
private boolean completed = false;
private int counter;
public boolean isCompleted() {
return completed;
}
public void setCompleted(boolean completed) {
this.completed = completed;
}
public int getCounter() {
return counter;
}
public void setCounter(int counter) {
this.counter = counter;
}
@Override
public void onSubscribe(Subscription subscription) {
this.subscription = subscription;
subscription.request(1);
}
@Override
public void onNext(String item) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
counter++;
System.out.println("Processed item : " + item);
subscription.request(1);
}
@Override
public void onError(Throwable t) {
t.printStackTrace();
}
@Override
public void onComplete() {
completed = true;
subscription.cancel();
}
}
core-java-modules/core-java-9/src/main/java/com/baeldung/java9/set/UnmodifiableSet.java
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package com.baeldung.java9.set;
import com.google.common.collect.ImmutableSet;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
public class UnmodifiableSet {
public static void main(String[] args) {
Set<String> set = new HashSet<>();
set.add("Canada");
set.add("USA");
coreJDK(set);
guavaOf();
copyOf(set);
java9Of();
}
private static void java9Of() {
Set<String> immutable = Set.of("Canada", "USA");
System.out.println(immutable);
}
private static void guavaOf() {
Set<String> immutable = ImmutableSet.of("Canada", "USA");
System.out.println(immutable);
}
private static void copyOf(Set<String> set) {
Set<String> immutable = ImmutableSet.copyOf(set);
set.add("Costa Rica");
System.out.println(immutable);
}
private static void coreJDK(Set<String> set) {
Set<String> unmodifiableSet = Collections.unmodifiableSet(set);
set.add("Costa Rica");
System.out.println(unmodifiableSet);
}
}
core-java-modules/core-java-9/src/main/java/com/baeldung/java9/stackwalker/StackWalkerDemo.java
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package com.baeldung.java9.stackwalker;
import java.lang.StackWalker.StackFrame;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class StackWalkerDemo {
public void methodOne() {
this.methodTwo();
}
public void methodTwo() {
this.methodThree();
}
public void methodThree() {
List<StackFrame> stackTrace = StackWalker.getInstance()
.walk(this::walkExample);
printStackTrace(stackTrace);
System.out.println("---------------------------------------------");
stackTrace = StackWalker.getInstance()
.walk(this::walkExample2);
printStackTrace(stackTrace);
System.out.println("---------------------------------------------");
String line = StackWalker.getInstance().walk(this::walkExample3);
System.out.println(line);
System.out.println("---------------------------------------------");
stackTrace = StackWalker.getInstance(StackWalker.Option.SHOW_REFLECT_FRAMES)
.walk(this::walkExample);
printStackTrace(stackTrace);
System.out.println("---------------------------------------------");
Runnable r = () -> {
List<StackFrame> stackTrace2 = StackWalker.getInstance(StackWalker.Option.SHOW_HIDDEN_FRAMES)
.walk(this::walkExample);
printStackTrace(stackTrace2);
};
r.run();
}
public List<StackFrame> walkExample(Stream<StackFrame> stackFrameStream) {
return stackFrameStream.collect(Collectors.toList());
}
public List<StackFrame> walkExample2(Stream<StackFrame> stackFrameStream) {
return stackFrameStream.filter(frame -> frame.getClassName()
.contains("com.baeldung"))
.collect(Collectors.toList());
}
public String walkExample3(Stream<StackFrame> stackFrameStream) {
return stackFrameStream.filter(frame -> frame.getClassName()
.contains("com.baeldung")
&& frame.getClassName()
.endsWith("Test"))
.findFirst()
.map(frame -> frame.getClassName() + "#" + frame.getMethodName() + ", Line " + frame.getLineNumber())
.orElse("Unknown caller");
}
public void findCaller() {
Class<?> caller = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE).getCallerClass();
System.out.println(caller.getCanonicalName());
}
public void printStackTrace(List<StackFrame> stackTrace) {
for (StackFrame stackFrame : stackTrace) {
System.out.println(stackFrame.getClassName()
.toString() + "#" + stackFrame.getMethodName() + ", Line " + stackFrame.getLineNumber());
}
}
}

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