Merge branch 'master' into master
This commit is contained in:
binary-joe
@@ -20,7 +20,6 @@
|
||||
- [Finding Min/Max in an Array with Java](http://www.baeldung.com/java-array-min-max)
|
||||
- [Internationalization and Localization in Java 8](http://www.baeldung.com/java-8-localization)
|
||||
- [Java Optional – orElse() vs orElseGet()](http://www.baeldung.com/java-optional-or-else-vs-or-else-get)
|
||||
- [Method Parameter Reflection in Java](http://www.baeldung.com/java-parameter-reflection)
|
||||
- [Java 8 Unsigned Arithmetic Support](http://www.baeldung.com/java-unsigned-arithmetic)
|
||||
- [Generalized Target-Type Inference in Java](http://www.baeldung.com/java-generalized-target-type-inference)
|
||||
- [Overriding System Time for Testing in Java](http://www.baeldung.com/java-override-system-time)
|
||||
|
||||
@@ -134,16 +134,6 @@
|
||||
</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>
|
||||
<compilerArgument>-parameters</compilerArgument>
|
||||
</configuration>
|
||||
</plugin>
|
||||
<plugin>
|
||||
<groupId>org.springframework.boot</groupId>
|
||||
<artifactId>spring-boot-maven-plugin</artifactId>
|
||||
@@ -192,7 +182,6 @@
|
||||
<jmh-generator.version>1.19</jmh-generator.version>
|
||||
<spring-boot-maven-plugin.version>2.0.4.RELEASE</spring-boot-maven-plugin.version>
|
||||
<!-- plugins -->
|
||||
<maven-compiler-plugin.version>3.8.0</maven-compiler-plugin.version>
|
||||
<maven-surefire-plugin.version>2.22.1</maven-surefire-plugin.version>
|
||||
</properties>
|
||||
</project>
|
||||
|
||||
+1
-1
@@ -1,4 +1,4 @@
|
||||
package com.baeldung.java8;
|
||||
package com.baeldung.java_8_features.groupingby;
|
||||
|
||||
import com.baeldung.java_8_features.groupingby.BlogPost;
|
||||
import com.baeldung.java_8_features.groupingby.BlogPostType;
|
||||
@@ -1,3 +1,5 @@
|
||||
## Relevant Articles
|
||||
|
||||
- [Extending an Array’s Length](https://www.baeldung.com/java-array-add-element-at-the-end)
|
||||
- [Checking If an Array Is Sorted in Java](https://www.baeldung.com/java-check-sorted-array)
|
||||
- [Looping Diagonally Through a 2d Java Array](https://www.baeldung.com/java-loop-diagonal-array)
|
||||
|
||||
+40
@@ -0,0 +1,40 @@
|
||||
package com.baeldung.java.list;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.Iterator;
|
||||
import java.util.List;
|
||||
|
||||
public class RemoveFromList {
|
||||
|
||||
public static void main(String[] args) {
|
||||
List<String> sports = new ArrayList<>();
|
||||
sports.add("Football");
|
||||
sports.add("Basketball");
|
||||
sports.add("Baseball");
|
||||
sports.add("Boxing");
|
||||
sports.add("Cycling");
|
||||
|
||||
System.out.println("List before removing: " + sports);
|
||||
|
||||
// Remove with index
|
||||
sports.remove(1);
|
||||
|
||||
// Remove with an element
|
||||
sports.remove("Baseball");
|
||||
|
||||
// Iterator remove method
|
||||
Iterator<String> iterator = sports.iterator();
|
||||
while (iterator.hasNext()) {
|
||||
if (iterator.next().equals("Boxing")) {
|
||||
iterator.remove();
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
// ArrayList removeIf method (Java 8)
|
||||
sports.removeIf(p -> p.equals("Cycling"));
|
||||
|
||||
System.out.println("List after removing: " + sports);
|
||||
}
|
||||
|
||||
}
|
||||
@@ -10,8 +10,4 @@
|
||||
- [Java List Initialization in One Line](https://www.baeldung.com/java-init-list-one-line)
|
||||
- [Ways to Iterate Over a List in Java](https://www.baeldung.com/java-iterate-list)
|
||||
- [Flattening Nested Collections in Java](http://www.baeldung.com/java-flatten-nested-collections)
|
||||
- [Intersection of Two Lists in Java](https://www.baeldung.com/java-lists-intersection)
|
||||
- [Determine If All Elements Are the Same in a Java List](https://www.baeldung.com/java-list-all-equal)
|
||||
- [List of Primitive Integer Values in Java](https://www.baeldung.com/java-list-primitive-int)
|
||||
- [Performance Comparison of Primitive Lists in Java](https://www.baeldung.com/java-list-primitive-performance)
|
||||
- [Filtering a Java Collection by a List](https://www.baeldung.com/java-filter-collection-by-list)
|
||||
- [Intersection of Two Lists in Java](https://www.baeldung.com/java-lists-intersection)
|
||||
@@ -36,41 +36,11 @@
|
||||
<version>${lombok.version}</version>
|
||||
<scope>provided</scope>
|
||||
</dependency>
|
||||
|
||||
<dependency>
|
||||
<groupId>net.sf.trove4j</groupId>
|
||||
<artifactId>trove4j</artifactId>
|
||||
<version>${trove4j.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>it.unimi.dsi</groupId>
|
||||
<artifactId>fastutil</artifactId>
|
||||
<version>${fastutil.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>colt</groupId>
|
||||
<artifactId>colt</artifactId>
|
||||
<version>${colt.version}</version>
|
||||
</dependency>
|
||||
|
||||
<dependency>
|
||||
<groupId>org.openjdk.jmh</groupId>
|
||||
<artifactId>jmh-core</artifactId>
|
||||
<version>${jmh-core.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.openjdk.jmh</groupId>
|
||||
<artifactId>jmh-generator-annprocess</artifactId>
|
||||
<version>${jmh-core.version}</version>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
|
||||
<properties>
|
||||
<commons-collections4.version>4.1</commons-collections4.version>
|
||||
<commons-lang3.version>3.8.1</commons-lang3.version>
|
||||
<assertj.version>3.11.1</assertj.version>
|
||||
<trove4j.version>3.0.2</trove4j.version>
|
||||
<fastutil.version>8.1.0</fastutil.version>
|
||||
<colt.version>1.2.0</colt.version>
|
||||
</properties>
|
||||
</project>
|
||||
|
||||
+1
-1
@@ -42,7 +42,7 @@ public class ListInitializationUnitTest {
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenArrayAsList_whenCreated_thenShareReference() {
|
||||
public void givenArraysAsList_whenCreated_thenShareReference() {
|
||||
String[] array = { "foo", "bar" };
|
||||
List<String> list = Arrays.asList(array);
|
||||
array[0] = "baz";
|
||||
|
||||
@@ -0,0 +1,11 @@
|
||||
=========
|
||||
|
||||
## Core Java Collections List Cookbooks and Examples
|
||||
|
||||
### Relevant Articles:
|
||||
- [Collections.emptyList() vs. New List Instance](https://www.baeldung.com/java-collections-emptylist-new-list)
|
||||
- [Copy a List to Another List in Java](http://www.baeldung.com/java-copy-list-to-another)
|
||||
- [Determine If All Elements Are the Same in a Java List](https://www.baeldung.com/java-list-all-equal)
|
||||
- [List of Primitive Integer Values in Java](https://www.baeldung.com/java-list-primitive-int)
|
||||
- [Performance Comparison of Primitive Lists in Java](https://www.baeldung.com/java-list-primitive-performance)
|
||||
- [Filtering a Java Collection by a List](https://www.baeldung.com/java-filter-collection-by-list)
|
||||
@@ -0,0 +1,76 @@
|
||||
<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-collections-list-3</artifactId>
|
||||
<version>0.1.0-SNAPSHOT</version>
|
||||
<name>core-java-collections-list-3</name>
|
||||
<packaging>jar</packaging>
|
||||
|
||||
<parent>
|
||||
<groupId>com.baeldung</groupId>
|
||||
<artifactId>parent-java</artifactId>
|
||||
<version>0.0.1-SNAPSHOT</version>
|
||||
<relativePath>../../parent-java</relativePath>
|
||||
</parent>
|
||||
|
||||
<dependencies>
|
||||
<dependency>
|
||||
<groupId>org.apache.commons</groupId>
|
||||
<artifactId>commons-collections4</artifactId>
|
||||
<version>${commons-collections4.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.apache.commons</groupId>
|
||||
<artifactId>commons-lang3</artifactId>
|
||||
<version>${commons-lang3.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.assertj</groupId>
|
||||
<artifactId>assertj-core</artifactId>
|
||||
<version>${assertj.version}</version>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.projectlombok</groupId>
|
||||
<artifactId>lombok</artifactId>
|
||||
<version>${lombok.version}</version>
|
||||
<scope>provided</scope>
|
||||
</dependency>
|
||||
|
||||
<dependency>
|
||||
<groupId>net.sf.trove4j</groupId>
|
||||
<artifactId>trove4j</artifactId>
|
||||
<version>${trove4j.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>it.unimi.dsi</groupId>
|
||||
<artifactId>fastutil</artifactId>
|
||||
<version>${fastutil.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>colt</groupId>
|
||||
<artifactId>colt</artifactId>
|
||||
<version>${colt.version}</version>
|
||||
</dependency>
|
||||
|
||||
<dependency>
|
||||
<groupId>org.openjdk.jmh</groupId>
|
||||
<artifactId>jmh-core</artifactId>
|
||||
<version>${jmh-core.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.openjdk.jmh</groupId>
|
||||
<artifactId>jmh-generator-annprocess</artifactId>
|
||||
<version>${jmh-core.version}</version>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
|
||||
<properties>
|
||||
<commons-collections4.version>4.1</commons-collections4.version>
|
||||
<commons-lang3.version>3.8.1</commons-lang3.version>
|
||||
<assertj.version>3.11.1</assertj.version>
|
||||
<trove4j.version>3.0.2</trove4j.version>
|
||||
<fastutil.version>8.1.0</fastutil.version>
|
||||
<colt.version>1.2.0</colt.version>
|
||||
</properties>
|
||||
</project>
|
||||
@@ -0,0 +1,13 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<configuration>
|
||||
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
|
||||
<encoder>
|
||||
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
|
||||
</pattern>
|
||||
</encoder>
|
||||
</appender>
|
||||
|
||||
<root level="INFO">
|
||||
<appender-ref ref="STDOUT" />
|
||||
</root>
|
||||
</configuration>
|
||||
@@ -10,7 +10,5 @@
|
||||
- [Iterating Backward Through a List](http://www.baeldung.com/java-list-iterate-backwards)
|
||||
- [Remove the First Element from a List](http://www.baeldung.com/java-remove-first-element-from-list)
|
||||
- [How to Find an Element in a List with Java](http://www.baeldung.com/find-list-element-java)
|
||||
- [Copy a List to Another List in Java](http://www.baeldung.com/java-copy-list-to-another)
|
||||
- [Finding Max/Min of a List or Collection](http://www.baeldung.com/java-collection-min-max)
|
||||
- [Collections.emptyList() vs. New List Instance](https://www.baeldung.com/java-collections-emptylist-new-list)
|
||||
- [Remove All Occurrences of a Specific Value from a List](https://www.baeldung.com/java-remove-value-from-list)
|
||||
@@ -0,0 +1,26 @@
|
||||
*.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
|
||||
@@ -0,0 +1,7 @@
|
||||
=========
|
||||
|
||||
## Core Java Concurrency 2 Examples
|
||||
|
||||
### Relevant Articles:
|
||||
- [Using a Mutex Object in Java](https://www.baeldung.com/java-mutex)
|
||||
|
||||
@@ -0,0 +1,27 @@
|
||||
<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-concurrency-2</artifactId>
|
||||
<version>0.1.0-SNAPSHOT</version>
|
||||
<name>core-java-concurrency-2</name>
|
||||
<packaging>jar</packaging>
|
||||
|
||||
<parent>
|
||||
<groupId>com.baeldung</groupId>
|
||||
<artifactId>parent-java</artifactId>
|
||||
<version>0.0.1-SNAPSHOT</version>
|
||||
<relativePath>../../parent-java</relativePath>
|
||||
</parent>
|
||||
|
||||
<build>
|
||||
<finalName>core-java-concurrency-2</finalName>
|
||||
<resources>
|
||||
<resource>
|
||||
<directory>src/main/resources</directory>
|
||||
<filtering>true</filtering>
|
||||
</resource>
|
||||
</resources>
|
||||
</build>
|
||||
|
||||
</project>
|
||||
+12
@@ -0,0 +1,12 @@
|
||||
package com.baeldung.concurrent.mutex;
|
||||
|
||||
public class SequenceGenerator {
|
||||
|
||||
private int currentValue = 0;
|
||||
|
||||
public int getNextSequence() {
|
||||
currentValue = currentValue + 1;
|
||||
return currentValue;
|
||||
}
|
||||
|
||||
}
|
||||
+19
@@ -0,0 +1,19 @@
|
||||
package com.baeldung.concurrent.mutex;
|
||||
|
||||
import com.google.common.util.concurrent.Monitor;
|
||||
|
||||
public class SequenceGeneratorUsingMonitor extends SequenceGenerator {
|
||||
|
||||
private Monitor mutex = new Monitor();
|
||||
|
||||
@Override
|
||||
public int getNextSequence() {
|
||||
mutex.enter();
|
||||
try {
|
||||
return super.getNextSequence();
|
||||
} finally {
|
||||
mutex.leave();
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
+19
@@ -0,0 +1,19 @@
|
||||
package com.baeldung.concurrent.mutex;
|
||||
|
||||
import java.util.concurrent.locks.ReentrantLock;
|
||||
|
||||
public class SequenceGeneratorUsingReentrantLock extends SequenceGenerator {
|
||||
|
||||
private ReentrantLock mutex = new ReentrantLock();
|
||||
|
||||
@Override
|
||||
public int getNextSequence() {
|
||||
try {
|
||||
mutex.lock();
|
||||
return super.getNextSequence();
|
||||
} finally {
|
||||
mutex.unlock();
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
+21
@@ -0,0 +1,21 @@
|
||||
package com.baeldung.concurrent.mutex;
|
||||
|
||||
import java.util.concurrent.Semaphore;
|
||||
|
||||
public class SequenceGeneratorUsingSemaphore extends SequenceGenerator {
|
||||
|
||||
private Semaphore mutex = new Semaphore(1);
|
||||
|
||||
@Override
|
||||
public int getNextSequence() {
|
||||
try {
|
||||
mutex.acquire();
|
||||
return super.getNextSequence();
|
||||
} catch (InterruptedException e) {
|
||||
throw new RuntimeException("Exception in critical section.", e);
|
||||
} finally {
|
||||
mutex.release();
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
+14
@@ -0,0 +1,14 @@
|
||||
package com.baeldung.concurrent.mutex;
|
||||
|
||||
public class SequenceGeneratorUsingSynchronizedBlock extends SequenceGenerator {
|
||||
|
||||
private Object mutex = new Object();
|
||||
|
||||
@Override
|
||||
public int getNextSequence() {
|
||||
synchronized (mutex) {
|
||||
return super.getNextSequence();
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
+10
@@ -0,0 +1,10 @@
|
||||
package com.baeldung.concurrent.mutex;
|
||||
|
||||
public class SequenceGeneratorUsingSynchronizedMethod extends SequenceGenerator {
|
||||
|
||||
@Override
|
||||
public synchronized int getNextSequence() {
|
||||
return super.getNextSequence();
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1,19 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<configuration>
|
||||
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
|
||||
<encoder>
|
||||
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%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>
|
||||
+80
@@ -0,0 +1,80 @@
|
||||
package com.baeldung.concurrent.mutex;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.LinkedHashSet;
|
||||
import java.util.List;
|
||||
import java.util.Set;
|
||||
import java.util.concurrent.ExecutorService;
|
||||
import java.util.concurrent.Executors;
|
||||
import java.util.concurrent.Future;
|
||||
import java.util.concurrent.TimeUnit;
|
||||
|
||||
import org.junit.Assert;
|
||||
import org.junit.Test;
|
||||
|
||||
public class MutexUnitTest {
|
||||
|
||||
// @Test
|
||||
// This test verifies the race condition use case, it may pass or fail based on execution environment
|
||||
// Uncomment @Test to run it
|
||||
public void givenUnsafeSequenceGenerator_whenRaceCondition_thenUnexpectedBehavior() throws Exception {
|
||||
int count = 1000;
|
||||
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGenerator(), count);
|
||||
Assert.assertNotEquals(count, uniqueSequences.size());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenSequenceGeneratorUsingSynchronizedMethod_whenRaceCondition_thenSuccess() throws Exception {
|
||||
int count = 1000;
|
||||
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingSynchronizedMethod(), count);
|
||||
Assert.assertEquals(count, uniqueSequences.size());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenSequenceGeneratorUsingSynchronizedBlock_whenRaceCondition_thenSuccess() throws Exception {
|
||||
int count = 1000;
|
||||
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingSynchronizedBlock(), count);
|
||||
Assert.assertEquals(count, uniqueSequences.size());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenSequenceGeneratorUsingReentrantLock_whenRaceCondition_thenSuccess() throws Exception {
|
||||
int count = 1000;
|
||||
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingReentrantLock(), count);
|
||||
Assert.assertEquals(count, uniqueSequences.size());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenSequenceGeneratorUsingSemaphore_whenRaceCondition_thenSuccess() throws Exception {
|
||||
int count = 1000;
|
||||
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingSemaphore(), count);
|
||||
Assert.assertEquals(count, uniqueSequences.size());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenSequenceGeneratorUsingMonitor_whenRaceCondition_thenSuccess() throws Exception {
|
||||
int count = 1000;
|
||||
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingMonitor(), count);
|
||||
Assert.assertEquals(count, uniqueSequences.size());
|
||||
}
|
||||
|
||||
private Set<Integer> getUniqueSequences(SequenceGenerator generator, int count) throws Exception {
|
||||
ExecutorService executor = Executors.newFixedThreadPool(3);
|
||||
Set<Integer> uniqueSequences = new LinkedHashSet<>();
|
||||
List<Future<Integer>> futures = new ArrayList<>();
|
||||
|
||||
for (int i = 0; i < count; i++) {
|
||||
futures.add(executor.submit(generator::getNextSequence));
|
||||
}
|
||||
|
||||
for (Future<Integer> future : futures) {
|
||||
uniqueSequences.add(future.get());
|
||||
}
|
||||
|
||||
executor.awaitTermination(1, TimeUnit.SECONDS);
|
||||
executor.shutdown();
|
||||
|
||||
return uniqueSequences;
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1,13 @@
|
||||
*.class
|
||||
|
||||
#folders#
|
||||
/target
|
||||
/neoDb*
|
||||
/data
|
||||
/src/main/webapp/WEB-INF/classes
|
||||
*/META-INF/*
|
||||
|
||||
# Packaged files #
|
||||
*.jar
|
||||
*.war
|
||||
*.ear
|
||||
+1
-1
@@ -1,4 +1,4 @@
|
||||
package com.baeldung.java8;
|
||||
package com.baeldung.concurrent.executorservice;
|
||||
|
||||
import static org.junit.Assert.assertEquals;
|
||||
import static org.junit.Assert.assertFalse;
|
||||
@@ -1,3 +1,8 @@
|
||||
## Relevant Articles:
|
||||
|
||||
- [Will an Error Be Caught by Catch Block in Java?](https://www.baeldung.com/java-error-catch)
|
||||
- [Java Global Exception Handler](http://www.baeldung.com/java-global-exception-handler)
|
||||
- [Common Java Exceptions](http://www.baeldung.com/java-common-exceptions)
|
||||
- [Throw Exception in Optional in Java 8](https://www.baeldung.com/java-optional-throw-exception)
|
||||
- [How to Find an Exception’s Root Cause in Java](https://www.baeldung.com/java-exception-root-cause)
|
||||
- [Java – Try with Resources](https://www.baeldung.com/java-try-with-resources)
|
||||
|
||||
@@ -26,10 +26,30 @@
|
||||
<artifactId>commons-lang3</artifactId>
|
||||
<version>${commons-lang3.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.openjdk.jmh</groupId>
|
||||
<artifactId>jmh-core</artifactId>
|
||||
<version>${jmh-core.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.openjdk.jmh</groupId>
|
||||
<artifactId>jmh-generator-annprocess</artifactId>
|
||||
<version>${jmh-generator-annprocess.version}</version>
|
||||
</dependency>
|
||||
<!-- test scoped -->
|
||||
<dependency>
|
||||
<groupId>org.assertj</groupId>
|
||||
<artifactId>assertj-core</artifactId>
|
||||
<version>${assertj-core.version}</version>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
|
||||
<properties>
|
||||
<commons-lang3.version>3.9</commons-lang3.version>
|
||||
<jmh-core.version>1.19</jmh-core.version>
|
||||
<assertj-core.version>3.10.0</assertj-core.version>
|
||||
<jmh-generator-annprocess.version>1.19</jmh-generator-annprocess.version>
|
||||
</properties>
|
||||
|
||||
</project>
|
||||
|
||||
+43
@@ -0,0 +1,43 @@
|
||||
package com.baeldung.exceptions;
|
||||
|
||||
import java.io.File;
|
||||
import java.io.FileInputStream;
|
||||
import java.io.FileNotFoundException;
|
||||
|
||||
public class CheckedUncheckedExceptions {
|
||||
public static void checkedExceptionWithThrows() throws FileNotFoundException {
|
||||
File file = new File("not_existing_file.txt");
|
||||
FileInputStream stream = new FileInputStream(file);
|
||||
}
|
||||
|
||||
public static void checkedExceptionWithTryCatch() {
|
||||
File file = new File("not_existing_file.txt");
|
||||
try {
|
||||
FileInputStream stream = new FileInputStream(file);
|
||||
} catch (FileNotFoundException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
||||
public static int divideByZero() {
|
||||
int numerator = 1;
|
||||
int denominator = 0;
|
||||
return numerator / denominator;
|
||||
}
|
||||
|
||||
public static void checkFile(String fileName) throws IncorrectFileNameException {
|
||||
if (fileName == null || fileName.isEmpty()) {
|
||||
throw new NullOrEmptyException("The filename is null.");
|
||||
}
|
||||
if (!isCorrectFileName(fileName)) {
|
||||
throw new IncorrectFileNameException("Incorrect filename : " + fileName);
|
||||
}
|
||||
}
|
||||
|
||||
private static boolean isCorrectFileName(String fileName) {
|
||||
if (fileName.equals("wrongFileName.txt"))
|
||||
return false;
|
||||
else
|
||||
return true;
|
||||
}
|
||||
}
|
||||
+13
@@ -0,0 +1,13 @@
|
||||
package com.baeldung.exceptions;
|
||||
|
||||
public class IncorrectFileNameException extends Exception {
|
||||
private static final long serialVersionUID = 1L;
|
||||
|
||||
public IncorrectFileNameException(String errorMessage) {
|
||||
super(errorMessage);
|
||||
}
|
||||
|
||||
public IncorrectFileNameException(String errorMessage, Throwable thr) {
|
||||
super(errorMessage, thr);
|
||||
}
|
||||
}
|
||||
+14
@@ -0,0 +1,14 @@
|
||||
package com.baeldung.exceptions;
|
||||
|
||||
public class NullOrEmptyException extends RuntimeException {
|
||||
|
||||
private static final long serialVersionUID = 1L;
|
||||
|
||||
public NullOrEmptyException(String errorMessage) {
|
||||
super(errorMessage);
|
||||
}
|
||||
|
||||
public NullOrEmptyException(String errorMessage, Throwable thr) {
|
||||
super(errorMessage, thr);
|
||||
}
|
||||
}
|
||||
+55
@@ -0,0 +1,55 @@
|
||||
package com.baeldung.exceptions;
|
||||
|
||||
import static org.junit.jupiter.api.Assertions.assertThrows;
|
||||
|
||||
import java.io.FileNotFoundException;
|
||||
|
||||
import org.junit.jupiter.api.Assertions;
|
||||
import org.junit.jupiter.api.Test;
|
||||
|
||||
/**
|
||||
* Tests the {@link CheckedUncheckedExceptions}.
|
||||
*/
|
||||
public class CheckedUncheckedExceptionsUnitTest {
|
||||
|
||||
@Test
|
||||
public void whenFileNotExist_thenThrowException() {
|
||||
assertThrows(FileNotFoundException.class, () -> {
|
||||
CheckedUncheckedExceptions.checkedExceptionWithThrows();
|
||||
});
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenTryCatchExcetpion_thenSuccess() {
|
||||
try {
|
||||
CheckedUncheckedExceptions.checkedExceptionWithTryCatch();
|
||||
} catch (Exception e) {
|
||||
Assertions.fail(e.getMessage());
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenDivideByZero_thenThrowException() {
|
||||
assertThrows(ArithmeticException.class, () -> {
|
||||
CheckedUncheckedExceptions.divideByZero();
|
||||
});
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenInvalidFile_thenThrowException() {
|
||||
|
||||
assertThrows(IncorrectFileNameException.class, () -> {
|
||||
CheckedUncheckedExceptions.checkFile("wrongFileName.txt");
|
||||
});
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenNullOrEmptyFile_thenThrowException() {
|
||||
assertThrows(NullOrEmptyException.class, () -> {
|
||||
CheckedUncheckedExceptions.checkFile(null);
|
||||
});
|
||||
assertThrows(NullOrEmptyException.class, () -> {
|
||||
CheckedUncheckedExceptions.checkFile("");
|
||||
});
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,3 @@
|
||||
# Intellij
|
||||
.idea/
|
||||
*.iml
|
||||
@@ -0,0 +1,279 @@
|
||||
<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-io-2</artifactId>
|
||||
<version>0.1.0-SNAPSHOT</version>
|
||||
<name>core-java-io-2</name>
|
||||
<packaging>jar</packaging>
|
||||
|
||||
<parent>
|
||||
<groupId>com.baeldung</groupId>
|
||||
<artifactId>parent-java</artifactId>
|
||||
<version>0.0.1-SNAPSHOT</version>
|
||||
<relativePath>../../parent-java</relativePath>
|
||||
</parent>
|
||||
|
||||
<dependencies>
|
||||
<!-- utils -->
|
||||
<dependency>
|
||||
<groupId>net.sourceforge.collections</groupId>
|
||||
<artifactId>collections-generic</artifactId>
|
||||
<version>${collections-generic.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.apache.commons</groupId>
|
||||
<artifactId>commons-collections4</artifactId>
|
||||
<version>${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>${log4j.version}</version>
|
||||
</dependency>
|
||||
<dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
|
||||
<groupId>org.slf4j</groupId>
|
||||
<artifactId>log4j-over-slf4j</artifactId>
|
||||
<version>${org.slf4j.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.projectlombok</groupId>
|
||||
<artifactId>lombok</artifactId>
|
||||
<version>${lombok.version}</version>
|
||||
<scope>provided</scope>
|
||||
</dependency>
|
||||
<!-- test scoped -->
|
||||
<dependency>
|
||||
<groupId>org.assertj</groupId>
|
||||
<artifactId>assertj-core</artifactId>
|
||||
<version>${assertj.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>${moneta.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.owasp.esapi</groupId>
|
||||
<artifactId>esapi</artifactId>
|
||||
<version>${esapi.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>com.sun.messaging.mq</groupId>
|
||||
<artifactId>fscontext</artifactId>
|
||||
<version>${fscontext.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>com.codepoetics</groupId>
|
||||
<artifactId>protonpack</artifactId>
|
||||
<version>${protonpack.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>one.util</groupId>
|
||||
<artifactId>streamex</artifactId>
|
||||
<version>${streamex.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>io.vavr</groupId>
|
||||
<artifactId>vavr</artifactId>
|
||||
<version>${vavr.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.openjdk.jmh</groupId>
|
||||
<artifactId>jmh-core</artifactId>
|
||||
<version>${jmh-core.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.openjdk.jmh</groupId>
|
||||
<artifactId>jmh-generator-annprocess</artifactId>
|
||||
<version>${jmh-generator-annprocess.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.hsqldb</groupId>
|
||||
<artifactId>hsqldb</artifactId>
|
||||
<version>${hsqldb.version}</version>
|
||||
<scope>runtime</scope>
|
||||
</dependency>
|
||||
<!-- https://mvnrepository.com/artifact/org.asynchttpclient/async-http-client -->
|
||||
<dependency>
|
||||
<groupId>org.asynchttpclient</groupId>
|
||||
<artifactId>async-http-client</artifactId>
|
||||
<version>${async-http-client.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>com.opencsv</groupId>
|
||||
<artifactId>opencsv</artifactId>
|
||||
<version>${opencsv.version}</version>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
<!-- Mime Type Resolution Libraries -->
|
||||
<dependency>
|
||||
<groupId>org.apache.tika</groupId>
|
||||
<artifactId>tika-core</artifactId>
|
||||
<version>${tika.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>net.sf.jmimemagic</groupId>
|
||||
<artifactId>jmimemagic</artifactId>
|
||||
<version>${jmime-magic.version}</version>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
|
||||
<build>
|
||||
<finalName>core-java-io-2</finalName>
|
||||
<resources>
|
||||
<resource>
|
||||
<directory>src/main/resources</directory>
|
||||
<filtering>true</filtering>
|
||||
</resource>
|
||||
</resources>
|
||||
<plugins>
|
||||
<plugin>
|
||||
<groupId>org.codehaus.mojo</groupId>
|
||||
<artifactId>exec-maven-plugin</artifactId>
|
||||
<version>${exec-maven-plugin.version}</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>
|
||||
<plugin>
|
||||
<groupId>org.apache.maven.plugins</groupId>
|
||||
<artifactId>maven-javadoc-plugin</artifactId>
|
||||
<version>${maven-javadoc-plugin.version}</version>
|
||||
<configuration>
|
||||
<source>${maven.compiler.source}</source>
|
||||
<target>${maven.compiler.target}</target>
|
||||
</configuration>
|
||||
</plugin>
|
||||
</plugins>
|
||||
</build>
|
||||
|
||||
<profiles>
|
||||
<profile>
|
||||
<id>integration</id>
|
||||
<build>
|
||||
<plugins>
|
||||
<plugin>
|
||||
<groupId>org.codehaus.mojo</groupId>
|
||||
<artifactId>exec-maven-plugin</artifactId>
|
||||
|
||||
<executions>
|
||||
<execution>
|
||||
<id>run-benchmarks</id>
|
||||
<!-- <phase>integration-test</phase> -->
|
||||
<phase>none</phase>
|
||||
<goals>
|
||||
<goal>exec</goal>
|
||||
</goals>
|
||||
<configuration>
|
||||
<classpathScope>test</classpathScope>
|
||||
<executable>java</executable>
|
||||
<arguments>
|
||||
<argument>-classpath</argument>
|
||||
<classpath />
|
||||
<argument>org.openjdk.jmh.Main</argument>
|
||||
<argument>.*</argument>
|
||||
</arguments>
|
||||
</configuration>
|
||||
</execution>
|
||||
</executions>
|
||||
</plugin>
|
||||
</plugins>
|
||||
</build>
|
||||
</profile>
|
||||
</profiles>
|
||||
|
||||
<properties>
|
||||
|
||||
<!-- util -->
|
||||
<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-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>
|
||||
<fscontext.version>4.6-b01</fscontext.version>
|
||||
<protonpack.version>1.13</protonpack.version>
|
||||
<streamex.version>0.6.5</streamex.version>
|
||||
<vavr.version>0.9.0</vavr.version>
|
||||
<opencsv.version>4.1</opencsv.version>
|
||||
<!-- testing -->
|
||||
<assertj.version>3.6.1</assertj.version>
|
||||
<avaitility.version>1.7.0</avaitility.version>
|
||||
|
||||
<!-- maven plugins -->
|
||||
<maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
|
||||
<hsqldb.version>2.4.0</hsqldb.version>
|
||||
<esapi.version>2.1.0.1</esapi.version>
|
||||
<jmh-generator-annprocess.version>1.19</jmh-generator-annprocess.version>
|
||||
<async-http-client.version>2.4.5</async-http-client.version>
|
||||
<!-- Mime Type Libraries -->
|
||||
<tika.version>1.18</tika.version>
|
||||
<jmime-magic.version>0.1.5</jmime-magic.version>
|
||||
</properties>
|
||||
|
||||
</project>
|
||||
+57
@@ -0,0 +1,57 @@
|
||||
package com.baeldung.filereader;
|
||||
|
||||
import java.io.*;
|
||||
|
||||
public class FileReaderExample {
|
||||
|
||||
public static String readAllCharactersOneByOne(Reader reader) throws IOException {
|
||||
StringBuilder content = new StringBuilder();
|
||||
int nextChar;
|
||||
while ((nextChar = reader.read()) != -1) {
|
||||
content.append((char) nextChar);
|
||||
}
|
||||
return String.valueOf(content);
|
||||
}
|
||||
|
||||
public static String readMultipleCharacters(Reader reader, int length) throws IOException {
|
||||
char[] buffer = new char[length];
|
||||
int charactersRead = reader.read(buffer, 0, length);
|
||||
|
||||
|
||||
if (charactersRead != -1) {
|
||||
return new String(buffer, 0, charactersRead);
|
||||
} else {
|
||||
return "";
|
||||
}
|
||||
}
|
||||
|
||||
public static String readFile(String path) {
|
||||
FileReader fileReader = null;
|
||||
try {
|
||||
fileReader = new FileReader(path);
|
||||
return readAllCharactersOneByOne(fileReader);
|
||||
} catch (IOException e) {
|
||||
e.printStackTrace();
|
||||
} finally {
|
||||
if (fileReader != null) {
|
||||
try {
|
||||
fileReader.close();
|
||||
} catch (IOException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
public static String readFileUsingTryWithResources(String path) {
|
||||
try (FileReader fileReader = new FileReader(path)) {
|
||||
return readAllCharactersOneByOne(fileReader);
|
||||
} catch (IOException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
|
||||
}
|
||||
+50
@@ -0,0 +1,50 @@
|
||||
package com.baeldung.filereader;
|
||||
|
||||
import org.junit.Assert;
|
||||
import org.junit.Test;
|
||||
|
||||
import java.io.File;
|
||||
import java.io.FileReader;
|
||||
import java.io.IOException;
|
||||
|
||||
public class FileReaderExampleUnitTest {
|
||||
|
||||
|
||||
private static final String FILE_PATH = "src/test/resources/HelloWorld.txt";
|
||||
|
||||
|
||||
@Test
|
||||
public void givenFileReader_whenReadAllCharacters_thenReturnsContent() throws IOException {
|
||||
String expectedText = "Hello, World!";
|
||||
File file = new File(FILE_PATH);
|
||||
try (FileReader fileReader = new FileReader(file)) {
|
||||
String content = FileReaderExample.readAllCharactersOneByOne(fileReader);
|
||||
Assert.assertEquals(expectedText, content);
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenFileReader_whenReadMultipleCharacters_thenReturnsContent() throws IOException {
|
||||
String expectedText = "Hello";
|
||||
File file = new File(FILE_PATH);
|
||||
try (FileReader fileReader = new FileReader(file)) {
|
||||
String content = FileReaderExample.readMultipleCharacters(fileReader, 5);
|
||||
Assert.assertEquals(expectedText, content);
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenReadFile_thenReturnsContent() {
|
||||
String expectedText = "Hello, World!";
|
||||
String content = FileReaderExample.readFile(FILE_PATH);
|
||||
Assert.assertEquals(expectedText, content);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenReadFileUsingTryWithResources_thenReturnsContent() {
|
||||
String expectedText = "Hello, World!";
|
||||
String content = FileReaderExample.readFileUsingTryWithResources(FILE_PATH);
|
||||
Assert.assertEquals(expectedText, content);
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1 @@
|
||||
Hello, World!
|
||||
@@ -207,6 +207,21 @@
|
||||
<target>${maven.compiler.target}</target>
|
||||
</configuration>
|
||||
</plugin>
|
||||
|
||||
<plugin>
|
||||
<!-- Build an executable JAR -->
|
||||
<groupId>org.apache.maven.plugins</groupId>
|
||||
<artifactId>maven-jar-plugin</artifactId>
|
||||
<version>${maven-jar-plugin.version}</version>
|
||||
<configuration>
|
||||
<archive>
|
||||
<manifest>
|
||||
<addClasspath>true</addClasspath>
|
||||
<mainClass>com.baeldung.resource.MyResourceLoader</mainClass>
|
||||
</manifest>
|
||||
</archive>
|
||||
</configuration>
|
||||
</plugin>
|
||||
</plugins>
|
||||
</build>
|
||||
|
||||
@@ -274,6 +289,8 @@
|
||||
<!-- Mime Type Libraries -->
|
||||
<tika.version>1.18</tika.version>
|
||||
<jmime-magic.version>0.1.5</jmime-magic.version>
|
||||
<maven-jar-plugin.version>3.1.0</maven-jar-plugin.version>
|
||||
|
||||
</properties>
|
||||
|
||||
</project>
|
||||
+42
@@ -0,0 +1,42 @@
|
||||
package com.baeldung.resource;
|
||||
|
||||
import java.io.BufferedReader;
|
||||
import java.io.FileReader;
|
||||
import java.io.IOException;
|
||||
import java.io.InputStream;
|
||||
import java.io.InputStreamReader;
|
||||
import java.util.stream.Collectors;
|
||||
|
||||
public class MyResourceLoader {
|
||||
|
||||
private void loadFileWithReader() throws IOException {
|
||||
|
||||
try (FileReader fileReader = new FileReader("src/main/resources/input.txt");
|
||||
BufferedReader reader = new BufferedReader(fileReader)) {
|
||||
String contents = reader.lines()
|
||||
.collect(Collectors.joining(System.lineSeparator()));
|
||||
System.out.println(contents);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
private void loadFileAsResource() throws IOException {
|
||||
|
||||
try (InputStream inputStream = getClass().getResourceAsStream("/input.txt");
|
||||
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
|
||||
String contents = reader.lines()
|
||||
.collect(Collectors.joining(System.lineSeparator()));
|
||||
System.out.println(contents);
|
||||
}
|
||||
}
|
||||
|
||||
public static void main(String[] args) throws IOException {
|
||||
|
||||
MyResourceLoader resourceLoader = new MyResourceLoader();
|
||||
|
||||
resourceLoader.loadFileAsResource();
|
||||
resourceLoader.loadFileWithReader();
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
+1
-1
@@ -1,4 +1,4 @@
|
||||
package com.baeldung.file;
|
||||
package com.baeldung.readfile;
|
||||
|
||||
import org.apache.commons.io.FileUtils;
|
||||
import org.apache.commons.io.IOUtils;
|
||||
+1
-1
@@ -1,4 +1,4 @@
|
||||
package org.baeldung.java.io;
|
||||
package org.baeldung.writetofile;
|
||||
|
||||
import static org.junit.Assert.assertEquals;
|
||||
|
||||
@@ -0,0 +1,66 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<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.jndi</groupId>
|
||||
<artifactId>core-java-jndi</artifactId>
|
||||
<version>1.0-SNAPSHOT</version>
|
||||
<name>core-java-jndi</name>
|
||||
|
||||
<parent>
|
||||
<groupId>com.baeldung</groupId>
|
||||
<artifactId>parent-modules</artifactId>
|
||||
<version>1.0.0-SNAPSHOT</version>
|
||||
<relativePath>../../</relativePath>
|
||||
</parent>
|
||||
|
||||
<dependencies>
|
||||
<dependency>
|
||||
<groupId>org.junit.jupiter</groupId>
|
||||
<artifactId>junit-jupiter</artifactId>
|
||||
<version>5.5.1</version>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.springframework</groupId>
|
||||
<artifactId>spring-core</artifactId>
|
||||
<version>5.0.9.RELEASE</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.springframework</groupId>
|
||||
<artifactId>spring-context</artifactId>
|
||||
<version>5.0.9.RELEASE</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.springframework</groupId>
|
||||
<artifactId>spring-jdbc</artifactId>
|
||||
<version>5.0.9.RELEASE</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.springframework</groupId>
|
||||
<artifactId>spring-test</artifactId>
|
||||
<version>5.0.9.RELEASE</version>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>com.h2database</groupId>
|
||||
<artifactId>h2</artifactId>
|
||||
<version>1.4.199</version>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
|
||||
<build>
|
||||
<plugins>
|
||||
<plugin>
|
||||
<groupId>org.apache.maven.plugins</groupId>
|
||||
<artifactId>maven-compiler-plugin</artifactId>
|
||||
<configuration>
|
||||
<source>1.8</source>
|
||||
<target>1.8</target>
|
||||
</configuration>
|
||||
</plugin>
|
||||
</plugins>
|
||||
</build>
|
||||
</project>
|
||||
@@ -0,0 +1,60 @@
|
||||
package com.baeldung.jndi;
|
||||
|
||||
import org.junit.jupiter.api.BeforeAll;
|
||||
import org.junit.jupiter.api.Test;
|
||||
import org.springframework.jdbc.datasource.DriverManagerDataSource;
|
||||
import org.springframework.jndi.JndiTemplate;
|
||||
import org.springframework.mock.jndi.SimpleNamingContextBuilder;
|
||||
|
||||
import javax.naming.*;
|
||||
import javax.sql.DataSource;
|
||||
|
||||
import java.util.Enumeration;
|
||||
|
||||
import static org.junit.jupiter.api.Assertions.*;
|
||||
|
||||
class JndiUnitTest {
|
||||
|
||||
private static InitialContext ctx;
|
||||
private static DriverManagerDataSource ds;
|
||||
|
||||
@BeforeAll
|
||||
static void setUp() throws Exception {
|
||||
SimpleNamingContextBuilder builder = new SimpleNamingContextBuilder();
|
||||
ds = new DriverManagerDataSource("jdbc:h2:mem:mydb");
|
||||
builder.activate();
|
||||
|
||||
JndiTemplate jndiTemplate = new JndiTemplate();
|
||||
ctx = (InitialContext) jndiTemplate.getContext();
|
||||
}
|
||||
|
||||
@Test
|
||||
void givenACompositeName_whenAddingAnElement_thenNameIncludesIt() throws Exception {
|
||||
Name objectName = new CompositeName("java:comp/env/jdbc");
|
||||
|
||||
Enumeration<String> elements = objectName.getAll();
|
||||
while(elements.hasMoreElements()) {
|
||||
System.out.println(elements.nextElement());
|
||||
}
|
||||
|
||||
objectName.add("example");
|
||||
|
||||
assertEquals("env", objectName.get(1));
|
||||
assertEquals("example", objectName.get(objectName.size() - 1));
|
||||
}
|
||||
|
||||
@Test
|
||||
void givenADataSource_whenAddingDriver_thenBind() throws Exception {
|
||||
ds.setDriverClassName("org.h2.Driver");
|
||||
ctx.bind("java:comp/env/jdbc/datasource", ds);
|
||||
}
|
||||
|
||||
@Test
|
||||
void givenContext_whenLookupByName_thenValidDataSource() throws Exception {
|
||||
DataSource ds = (DataSource) ctx.lookup("java:comp/env/jdbc/datasource");
|
||||
|
||||
assertNotNull(ds);
|
||||
assertNotNull(ds.getConnection());
|
||||
}
|
||||
|
||||
}
|
||||
+42
@@ -0,0 +1,42 @@
|
||||
package com.baeldung.jndi.exceptions;
|
||||
|
||||
import org.junit.jupiter.api.MethodOrderer;
|
||||
import org.junit.jupiter.api.Order;
|
||||
import org.junit.jupiter.api.Test;
|
||||
import org.junit.jupiter.api.TestMethodOrder;
|
||||
import org.springframework.jndi.JndiTemplate;
|
||||
import org.springframework.mock.jndi.SimpleNamingContextBuilder;
|
||||
|
||||
import javax.naming.InitialContext;
|
||||
import javax.naming.NameNotFoundException;
|
||||
import javax.naming.NoInitialContextException;
|
||||
|
||||
import static org.junit.jupiter.api.Assertions.assertThrows;
|
||||
|
||||
@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
|
||||
public class JndiExceptionsUnitTest {
|
||||
|
||||
@Test
|
||||
@Order(1)
|
||||
void givenNoContext_whenLookupObject_thenThrowNoInitialContext() {
|
||||
assertThrows(NoInitialContextException.class, () -> {
|
||||
JndiTemplate jndiTemplate = new JndiTemplate();
|
||||
InitialContext ctx = (InitialContext) jndiTemplate.getContext();
|
||||
ctx.lookup("java:comp/env/jdbc/datasource");
|
||||
}).printStackTrace();
|
||||
}
|
||||
|
||||
@Test
|
||||
@Order(2)
|
||||
void givenEmptyContext_whenLookupNotBounds_thenThrowNameNotFound() {
|
||||
assertThrows(NameNotFoundException.class, () -> {
|
||||
SimpleNamingContextBuilder builder = new SimpleNamingContextBuilder();
|
||||
builder.activate();
|
||||
|
||||
JndiTemplate jndiTemplate = new JndiTemplate();
|
||||
InitialContext ctx = (InitialContext) jndiTemplate.getContext();
|
||||
ctx.lookup("badJndiName");
|
||||
}).printStackTrace();
|
||||
}
|
||||
|
||||
}
|
||||
+33
@@ -0,0 +1,33 @@
|
||||
package com.baeldung.systemgc;
|
||||
|
||||
import java.util.HashMap;
|
||||
import java.util.Map;
|
||||
import java.util.Scanner;
|
||||
|
||||
import static java.util.UUID.randomUUID;
|
||||
|
||||
public class DemoApplication {
|
||||
|
||||
private static final Map<String, String> cache = new HashMap<String, String>();
|
||||
|
||||
public static void main(String[] args) {
|
||||
Scanner scanner = new Scanner(System.in);
|
||||
|
||||
while (scanner.hasNext()) {
|
||||
final String next = scanner.next();
|
||||
if ("fill".equals(next)) {
|
||||
for (int i = 0; i < 1000000; i++) {
|
||||
cache.put(randomUUID().toString(), randomUUID().toString());
|
||||
}
|
||||
} else if ("invalidate".equals(next)) {
|
||||
cache.clear();
|
||||
} else if ("gc".equals(next)) {
|
||||
System.gc();
|
||||
} else if ("exit".equals(next)) {
|
||||
System.exit(0);
|
||||
} else {
|
||||
System.out.println("unknown");
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -5,7 +5,7 @@
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>core-java-lambdas</artifactId>
|
||||
<version>0.1.0-SNAPSHOT</version>
|
||||
<name>core-java</name>
|
||||
<name>core-java-lambdas</name>
|
||||
<packaging>jar</packaging>
|
||||
|
||||
<parent>
|
||||
|
||||
@@ -0,0 +1,25 @@
|
||||
*.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
|
||||
backup-pom.xml
|
||||
/bin/
|
||||
/temp
|
||||
|
||||
#IntelliJ specific
|
||||
.idea/
|
||||
*.iml
|
||||
@@ -0,0 +1,5 @@
|
||||
=========
|
||||
|
||||
## Core Java Lang Cookbooks and Examples
|
||||
|
||||
### Relevant Articles:
|
||||
@@ -0,0 +1,33 @@
|
||||
<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-lang-2</artifactId>
|
||||
<version>0.1.0-SNAPSHOT</version>
|
||||
<name>core-java-lang-2</name>
|
||||
<packaging>jar</packaging>
|
||||
|
||||
<parent>
|
||||
<groupId>com.baeldung</groupId>
|
||||
<artifactId>parent-java</artifactId>
|
||||
<version>0.0.1-SNAPSHOT</version>
|
||||
<relativePath>../../parent-java</relativePath>
|
||||
</parent>
|
||||
|
||||
<dependencies>
|
||||
</dependencies>
|
||||
|
||||
<build>
|
||||
<finalName>core-java-lang-2</finalName>
|
||||
<resources>
|
||||
<resource>
|
||||
<directory>src/main/resources</directory>
|
||||
<filtering>true</filtering>
|
||||
</resource>
|
||||
</resources>
|
||||
</build>
|
||||
|
||||
<properties>
|
||||
</properties>
|
||||
|
||||
</project>
|
||||
+12
@@ -0,0 +1,12 @@
|
||||
package com.baeldung.commandlinearguments;
|
||||
|
||||
public class CliExample {
|
||||
|
||||
public static void main(String[] args) {
|
||||
System.out.println("Argument count: " + args.length);
|
||||
for (int i = 0; i < args.length; i++) {
|
||||
System.out.println("Argument " + i + ": " + args[i]);
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
+12
@@ -0,0 +1,12 @@
|
||||
package com.baeldung.commandlinearguments;
|
||||
|
||||
public class CliExampleWithVarargs {
|
||||
|
||||
public static void main(String... args) {
|
||||
System.out.println("Argument count: " + args.length);
|
||||
for (int i = 0; i < args.length; i++) {
|
||||
System.out.println("Argument " + i + ": " + args[i]);
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
@@ -7,3 +7,9 @@
|
||||
- [Cannot Reference “X” Before Supertype Constructor Has Been Called](https://www.baeldung.com/java-cannot-reference-x-before-supertype-constructor-error)
|
||||
- [Anonymous Classes in Java](https://www.baeldung.com/java-anonymous-classes)
|
||||
- [Raw Types in Java](https://www.baeldung.com/raw-types-java)
|
||||
- [Java ‘private’ Access Modifier](https://www.baeldung.com/java-private-keyword)
|
||||
- [Marker Interfaces in Java](https://www.baeldung.com/java-marker-interfaces)
|
||||
- [Java equals() and hashCode() Contracts](https://www.baeldung.com/java-equals-hashcode-contracts)
|
||||
- [Immutable Objects in Java](http://www.baeldung.com/java-immutable-object)
|
||||
- [Inheritance and Composition (Is-a vs Has-a relationship) in Java](http://www.baeldung.com/java-inheritance-composition)
|
||||
- [A Guide to Constructors in Java](https://www.baeldung.com/java-constructors)
|
||||
|
||||
@@ -14,6 +14,29 @@
|
||||
<relativePath>../../parent-java</relativePath>
|
||||
</parent>
|
||||
|
||||
<dependencies>
|
||||
<!-- test scoped -->
|
||||
<dependency>
|
||||
<groupId>org.assertj</groupId>
|
||||
<artifactId>assertj-core</artifactId>
|
||||
<version>${assertj-core.version}</version>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>nl.jqno.equalsverifier</groupId>
|
||||
<artifactId>equalsverifier</artifactId>
|
||||
<version>${equalsverifier.version}</version>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
|
||||
<properties>
|
||||
<h2.version>1.4.199</h2.version>
|
||||
<!-- testing -->
|
||||
<assertj-core.version>3.10.0</assertj-core.version>
|
||||
<equalsverifier.version>3.0.3</equalsverifier.version>
|
||||
</properties>
|
||||
|
||||
<build>
|
||||
<finalName>core-java-lang-oop-2</finalName>
|
||||
<resources>
|
||||
|
||||
+37
@@ -0,0 +1,37 @@
|
||||
package com.baeldung.basicmethods;
|
||||
|
||||
import java.io.FileWriter;
|
||||
import java.io.IOException;
|
||||
import java.io.PrintWriter;
|
||||
|
||||
public class PersonName {
|
||||
|
||||
public String getName(String firstName, String lastName) throws RuntimeException {
|
||||
return firstName + " " + lastName;
|
||||
}
|
||||
|
||||
public String getName(String firstName, String middleName, String lastName) {
|
||||
if (!middleName.equals("")) {
|
||||
return firstName + " " + lastName;
|
||||
}
|
||||
return firstName + " " + middleName + " " + lastName;
|
||||
}
|
||||
|
||||
public void printFullName(String firstName, String lastName) {
|
||||
System.out.println(firstName + " " + lastName);
|
||||
}
|
||||
|
||||
public void writeName(String name) throws IOException {
|
||||
PrintWriter out = new PrintWriter(new FileWriter("OutFile.txt"));
|
||||
out.println("Name: " + name);
|
||||
out.close();
|
||||
}
|
||||
|
||||
public static String getNameStatic(String firstName, String lastName) {
|
||||
return firstName + " " + lastName;
|
||||
}
|
||||
|
||||
public static void callToStaticMethod() {
|
||||
System.out.println("Name is: " + PersonName.getNameStatic("Alan", "Turing"));
|
||||
}
|
||||
}
|
||||
+30
@@ -0,0 +1,30 @@
|
||||
package com.baeldung.copyconstructor;
|
||||
|
||||
import java.util.Date;
|
||||
|
||||
public class Employee {
|
||||
|
||||
protected int id;
|
||||
protected String name;
|
||||
protected Date startDate;
|
||||
|
||||
public Employee(int id, String name, Date startDate) {
|
||||
this.id = id;
|
||||
this.name = name;
|
||||
this.startDate = startDate;
|
||||
}
|
||||
|
||||
public Employee(Employee employee) {
|
||||
this.id = employee.id;
|
||||
this.name = employee.name;
|
||||
this.startDate = new Date(employee.startDate.getTime());
|
||||
}
|
||||
|
||||
Date getStartDate() {
|
||||
return startDate;
|
||||
}
|
||||
|
||||
public Employee copy() {
|
||||
return new Employee(this);
|
||||
}
|
||||
}
|
||||
+31
@@ -0,0 +1,31 @@
|
||||
package com.baeldung.copyconstructor;
|
||||
|
||||
import java.util.Date;
|
||||
import java.util.List;
|
||||
import java.util.stream.Collectors;
|
||||
|
||||
public class Manager extends Employee {
|
||||
|
||||
private List<Employee> directReports;
|
||||
|
||||
public Manager(int id, String name, Date startDate, List<Employee> directReports) {
|
||||
super(id, name, startDate);
|
||||
this.directReports = directReports;
|
||||
}
|
||||
|
||||
public Manager(Manager manager) {
|
||||
super(manager.id, manager.name, manager.startDate);
|
||||
this.directReports = manager.directReports.stream()
|
||||
.collect(Collectors.toList());
|
||||
}
|
||||
|
||||
@Override
|
||||
public Employee copy() {
|
||||
return new Manager(this);
|
||||
}
|
||||
|
||||
List<Employee> getDirectReport() {
|
||||
return this.directReports;
|
||||
}
|
||||
|
||||
}
|
||||
+59
@@ -0,0 +1,59 @@
|
||||
package com.baeldung.core.modifiers;
|
||||
|
||||
public class Employee {
|
||||
|
||||
private String privateId;
|
||||
private String name;
|
||||
private boolean manager;
|
||||
|
||||
public Employee(String id, String name) {
|
||||
setPrivateId(id);
|
||||
setName(name);
|
||||
}
|
||||
|
||||
private Employee(String id, String name, boolean managerAttribute) {
|
||||
this.privateId = id;
|
||||
this.name = name;
|
||||
this.privateId = id + "_ID-MANAGER";
|
||||
}
|
||||
|
||||
public void setPrivateId(String customId) {
|
||||
if (customId.endsWith("_ID")) {
|
||||
this.privateId = customId;
|
||||
} else {
|
||||
this.privateId = customId + "_ID";
|
||||
}
|
||||
}
|
||||
|
||||
public String getPrivateId() {
|
||||
return privateId;
|
||||
}
|
||||
|
||||
public boolean isManager() {
|
||||
return manager;
|
||||
}
|
||||
|
||||
public void elevateToManager() {
|
||||
if ("Carl".equals(this.name)) {
|
||||
setManager(true);
|
||||
}
|
||||
}
|
||||
|
||||
private void setManager(boolean manager) {
|
||||
this.manager = manager;
|
||||
}
|
||||
|
||||
|
||||
public String getName() {
|
||||
return name;
|
||||
}
|
||||
|
||||
public void setName(String name) {
|
||||
this.name = name;
|
||||
}
|
||||
|
||||
public static Employee buildManager(String id, String name) {
|
||||
return new Employee(id, name, true);
|
||||
}
|
||||
|
||||
}
|
||||
+10
@@ -0,0 +1,10 @@
|
||||
package com.baeldung.core.modifiers;
|
||||
|
||||
public class ExampleClass {
|
||||
|
||||
public static void main(String[] args) {
|
||||
Employee employee = new Employee("Bob","ABC123");
|
||||
employee.setPrivateId("BCD234");
|
||||
System.out.println(employee.getPrivateId());
|
||||
}
|
||||
}
|
||||
+16
@@ -0,0 +1,16 @@
|
||||
package com.baeldung.core.modifiers;
|
||||
|
||||
public class PublicOuterClass {
|
||||
|
||||
public PrivateInnerClass getInnerClassInstance() {
|
||||
PrivateInnerClass myPrivateClassInstance = this.new PrivateInnerClass();
|
||||
myPrivateClassInstance.id = "ID1";
|
||||
myPrivateClassInstance.name = "Bob";
|
||||
return myPrivateClassInstance;
|
||||
}
|
||||
|
||||
private class PrivateInnerClass {
|
||||
public String name;
|
||||
public String id;
|
||||
}
|
||||
}
|
||||
Some files were not shown because too many files have changed in this diff Show More
Reference in New Issue
Block a user