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Add examples for Fork/Join framework

This commit is contained in:
David Morley 2016-04-21 05:20:13 -05:00
parent 0815d31ea4 8cbf2e3b88
commit 0ac51eca15
25 changed files with 254 additions and 292 deletions
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36
core-java-8/.classpath
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<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" output="target/classes" path="src/main/java">
<attributes>
<attribute name="optional" value="true"/>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="src" output="target/test-classes" path="src/test/java">
<attributes>
<attribute name="optional" value="true"/>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
<attributes>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
<attributes>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
<attributes>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
<attributes>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="output" path="target/classes"/>
</classpath>

24
core-java-8/.project
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<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>core-java-8</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.m2e.core.maven2Builder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jem.workbench.JavaEMFNature</nature>
<nature>org.eclipse.jdt.core.javanature</nature>
<nature>org.eclipse.m2e.core.maven2Nature</nature>
</natures>
</projectDescription>

5
core-java-8/.settings/.jsdtscope
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<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src/main/webapp"/>
<classpathentry kind="output" path=""/>
</classpath>

101
core-java-8/.settings/org.eclipse.jdt.core.prefs
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eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.annotation.inheritNullAnnotations=disabled
org.eclipse.jdt.core.compiler.annotation.missingNonNullByDefaultAnnotation=ignore
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org.eclipse.jdt.core.compiler.annotation.nonnullbydefault=org.eclipse.jdt.annotation.NonNullByDefault
org.eclipse.jdt.core.compiler.annotation.nullable=org.eclipse.jdt.annotation.Nullable
org.eclipse.jdt.core.compiler.annotation.nullanalysis=disabled
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
org.eclipse.jdt.core.compiler.compliance=1.8
org.eclipse.jdt.core.compiler.debug.lineNumber=generate
org.eclipse.jdt.core.compiler.debug.localVariable=generate
org.eclipse.jdt.core.compiler.debug.sourceFile=generate
org.eclipse.jdt.core.compiler.problem.annotationSuperInterface=warning
org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
org.eclipse.jdt.core.compiler.problem.autoboxing=ignore
org.eclipse.jdt.core.compiler.problem.comparingIdentical=warning
org.eclipse.jdt.core.compiler.problem.deadCode=warning
org.eclipse.jdt.core.compiler.problem.deprecation=warning
org.eclipse.jdt.core.compiler.problem.deprecationInDeprecatedCode=disabled
org.eclipse.jdt.core.compiler.problem.deprecationWhenOverridingDeprecatedMethod=disabled
org.eclipse.jdt.core.compiler.problem.discouragedReference=warning
org.eclipse.jdt.core.compiler.problem.emptyStatement=ignore
org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
org.eclipse.jdt.core.compiler.problem.explicitlyClosedAutoCloseable=ignore
org.eclipse.jdt.core.compiler.problem.fallthroughCase=ignore
org.eclipse.jdt.core.compiler.problem.fatalOptionalError=disabled
org.eclipse.jdt.core.compiler.problem.fieldHiding=warning
org.eclipse.jdt.core.compiler.problem.finalParameterBound=warning
org.eclipse.jdt.core.compiler.problem.finallyBlockNotCompletingNormally=warning
org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
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org.eclipse.jdt.core.compiler.problem.includeNullInfoFromAsserts=disabled
org.eclipse.jdt.core.compiler.problem.incompatibleNonInheritedInterfaceMethod=warning
org.eclipse.jdt.core.compiler.problem.incompleteEnumSwitch=ignore
org.eclipse.jdt.core.compiler.problem.indirectStaticAccess=ignore
org.eclipse.jdt.core.compiler.problem.localVariableHiding=warning
org.eclipse.jdt.core.compiler.problem.methodWithConstructorName=warning
org.eclipse.jdt.core.compiler.problem.missingDefaultCase=ignore
org.eclipse.jdt.core.compiler.problem.missingDeprecatedAnnotation=ignore
org.eclipse.jdt.core.compiler.problem.missingEnumCaseDespiteDefault=disabled
org.eclipse.jdt.core.compiler.problem.missingHashCodeMethod=ignore
org.eclipse.jdt.core.compiler.problem.missingOverrideAnnotation=ignore
org.eclipse.jdt.core.compiler.problem.missingOverrideAnnotationForInterfaceMethodImplementation=enabled
org.eclipse.jdt.core.compiler.problem.missingSerialVersion=warning
org.eclipse.jdt.core.compiler.problem.missingSynchronizedOnInheritedMethod=ignore
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org.eclipse.jdt.core.compiler.problem.nonExternalizedStringLiteral=ignore
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org.eclipse.jdt.core.compiler.problem.nullReference=warning
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org.eclipse.jdt.core.compiler.problem.nullUncheckedConversion=warning
org.eclipse.jdt.core.compiler.problem.overridingPackageDefaultMethod=warning
org.eclipse.jdt.core.compiler.problem.parameterAssignment=ignore
org.eclipse.jdt.core.compiler.problem.possibleAccidentalBooleanAssignment=ignore
org.eclipse.jdt.core.compiler.problem.potentialNullReference=ignore
org.eclipse.jdt.core.compiler.problem.potentiallyUnclosedCloseable=ignore
org.eclipse.jdt.core.compiler.problem.rawTypeReference=warning
org.eclipse.jdt.core.compiler.problem.redundantNullAnnotation=warning
org.eclipse.jdt.core.compiler.problem.redundantNullCheck=ignore
org.eclipse.jdt.core.compiler.problem.redundantSpecificationOfTypeArguments=ignore
org.eclipse.jdt.core.compiler.problem.redundantSuperinterface=ignore
org.eclipse.jdt.core.compiler.problem.reportMethodCanBePotentiallyStatic=ignore
org.eclipse.jdt.core.compiler.problem.reportMethodCanBeStatic=ignore
org.eclipse.jdt.core.compiler.problem.specialParameterHidingField=disabled
org.eclipse.jdt.core.compiler.problem.staticAccessReceiver=warning
org.eclipse.jdt.core.compiler.problem.suppressOptionalErrors=disabled
org.eclipse.jdt.core.compiler.problem.suppressWarnings=enabled
org.eclipse.jdt.core.compiler.problem.syntacticNullAnalysisForFields=disabled
org.eclipse.jdt.core.compiler.problem.syntheticAccessEmulation=ignore
org.eclipse.jdt.core.compiler.problem.typeParameterHiding=error
org.eclipse.jdt.core.compiler.problem.unavoidableGenericTypeProblems=enabled
org.eclipse.jdt.core.compiler.problem.uncheckedTypeOperation=warning
org.eclipse.jdt.core.compiler.problem.unclosedCloseable=warning
org.eclipse.jdt.core.compiler.problem.undocumentedEmptyBlock=ignore
org.eclipse.jdt.core.compiler.problem.unhandledWarningToken=warning
org.eclipse.jdt.core.compiler.problem.unnecessaryElse=ignore
org.eclipse.jdt.core.compiler.problem.unnecessaryTypeCheck=ignore
org.eclipse.jdt.core.compiler.problem.unqualifiedFieldAccess=ignore
org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownException=ignore
org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownExceptionExemptExceptionAndThrowable=enabled
org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownExceptionIncludeDocCommentReference=enabled
org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownExceptionWhenOverriding=disabled
org.eclipse.jdt.core.compiler.problem.unusedExceptionParameter=ignore
org.eclipse.jdt.core.compiler.problem.unusedImport=warning
org.eclipse.jdt.core.compiler.problem.unusedLabel=warning
org.eclipse.jdt.core.compiler.problem.unusedLocal=warning
org.eclipse.jdt.core.compiler.problem.unusedObjectAllocation=ignore
org.eclipse.jdt.core.compiler.problem.unusedParameter=ignore
org.eclipse.jdt.core.compiler.problem.unusedParameterIncludeDocCommentReference=enabled
org.eclipse.jdt.core.compiler.problem.unusedParameterWhenImplementingAbstract=disabled
org.eclipse.jdt.core.compiler.problem.unusedParameterWhenOverridingConcrete=disabled
org.eclipse.jdt.core.compiler.problem.unusedPrivateMember=warning
org.eclipse.jdt.core.compiler.problem.unusedTypeParameter=ignore
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org.eclipse.jdt.core.compiler.problem.varargsArgumentNeedCast=warning
org.eclipse.jdt.core.compiler.source=1.8

57
core-java-8/.settings/org.eclipse.jdt.ui.prefs
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@ -1,57 +0,0 @@
eclipse.preferences.version=1
editor_save_participant_org.eclipse.jdt.ui.postsavelistener.cleanup=true
sp_cleanup.add_default_serial_version_id=true
sp_cleanup.add_generated_serial_version_id=false
sp_cleanup.add_missing_annotations=true
sp_cleanup.add_missing_deprecated_annotations=true
sp_cleanup.add_missing_methods=false
sp_cleanup.add_missing_nls_tags=false
sp_cleanup.add_missing_override_annotations=true
sp_cleanup.add_missing_override_annotations_interface_methods=true
sp_cleanup.add_serial_version_id=false
sp_cleanup.always_use_blocks=true
sp_cleanup.always_use_parentheses_in_expressions=true
sp_cleanup.always_use_this_for_non_static_field_access=false
sp_cleanup.always_use_this_for_non_static_method_access=false
sp_cleanup.convert_functional_interfaces=false
sp_cleanup.convert_to_enhanced_for_loop=true
sp_cleanup.correct_indentation=true
sp_cleanup.format_source_code=true
sp_cleanup.format_source_code_changes_only=true
sp_cleanup.make_local_variable_final=true
sp_cleanup.make_parameters_final=true
sp_cleanup.make_private_fields_final=false
sp_cleanup.make_type_abstract_if_missing_method=false
sp_cleanup.make_variable_declarations_final=true
sp_cleanup.never_use_blocks=false
sp_cleanup.never_use_parentheses_in_expressions=false
sp_cleanup.on_save_use_additional_actions=true
sp_cleanup.organize_imports=true
sp_cleanup.qualify_static_field_accesses_with_declaring_class=false
sp_cleanup.qualify_static_member_accesses_through_instances_with_declaring_class=true
sp_cleanup.qualify_static_member_accesses_through_subtypes_with_declaring_class=true
sp_cleanup.qualify_static_member_accesses_with_declaring_class=true
sp_cleanup.qualify_static_method_accesses_with_declaring_class=false
sp_cleanup.remove_private_constructors=true
sp_cleanup.remove_trailing_whitespaces=true
sp_cleanup.remove_trailing_whitespaces_all=true
sp_cleanup.remove_trailing_whitespaces_ignore_empty=false
sp_cleanup.remove_unnecessary_casts=true
sp_cleanup.remove_unnecessary_nls_tags=false
sp_cleanup.remove_unused_imports=true
sp_cleanup.remove_unused_local_variables=false
sp_cleanup.remove_unused_private_fields=true
sp_cleanup.remove_unused_private_members=false
sp_cleanup.remove_unused_private_methods=true
sp_cleanup.remove_unused_private_types=true
sp_cleanup.sort_members=false
sp_cleanup.sort_members_all=false
sp_cleanup.use_anonymous_class_creation=false
sp_cleanup.use_blocks=true
sp_cleanup.use_blocks_only_for_return_and_throw=false
sp_cleanup.use_lambda=false
sp_cleanup.use_parentheses_in_expressions=false
sp_cleanup.use_this_for_non_static_field_access=true
sp_cleanup.use_this_for_non_static_field_access_only_if_necessary=true
sp_cleanup.use_this_for_non_static_method_access=true
sp_cleanup.use_this_for_non_static_method_access_only_if_necessary=true

4
core-java-8/.settings/org.eclipse.m2e.core.prefs
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@ -1,4 +0,0 @@
activeProfiles=
eclipse.preferences.version=1
resolveWorkspaceProjects=true
version=1

14
core-java-8/.springBeans
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@ -1,14 +0,0 @@
<?xml version="1.0" encoding="UTF-8"?>
<beansProjectDescription>
<version>1</version>
<pluginVersion><![CDATA[3.3.0.201307091516-RELEASE]]></pluginVersion>
<configSuffixes>
<configSuffix><![CDATA[xml]]></configSuffix>
</configSuffixes>
<enableImports><![CDATA[false]]></enableImports>
<configs>
<config>src/main/webapp/WEB-INF/api-servlet.xml</config>
</configs>
<configSets>
</configSets>
</beansProjectDescription>

3
core-java-8/pom.xml
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@ -1,4 +1,5 @@
<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">
<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-java8</artifactId>

49
core-java-8/src/main/java/com/baeldung/forkjoin/CustomRecursiveAction.java Normal file
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@ -0,0 +1,49 @@
package com.baeldung.forkjoin;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.ForkJoinTask;
import java.util.concurrent.RecursiveAction;
import java.util.logging.Logger;
public class CustomRecursiveAction extends RecursiveAction {
private String workLoad = "";
private static final int THRESHOLD = 4;
private static Logger logger = Logger.getAnonymousLogger();
public CustomRecursiveAction(String workLoad) {
this.workLoad = workLoad;
}
@Override
protected void compute() {
if (workLoad.length() > THRESHOLD) {
ForkJoinTask.invokeAll(createSubtasks());
} else {
processing(workLoad);
}
}
private Collection<CustomRecursiveAction> createSubtasks() {
List<CustomRecursiveAction> subtasks =
new ArrayList<>();
String partOne = workLoad.substring(0, workLoad.length() / 2);
String partTwo = workLoad.substring(workLoad.length() / 2, workLoad.length());
subtasks.add(new CustomRecursiveAction(partOne));
subtasks.add(new CustomRecursiveAction(partTwo));
return subtasks;
}
private void processing(String work) {
String result = work.toUpperCase();
logger.info("This result - (" + result + ") - was processed by " + Thread.currentThread().getName());
}
}

51
core-java-8/src/main/java/com/baeldung/forkjoin/CustomRecursiveTask.java Normal file
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@ -0,0 +1,51 @@
package com.baeldung.forkjoin;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.ForkJoinTask;
import java.util.concurrent.RecursiveTask;
public class CustomRecursiveTask extends RecursiveTask<Integer> {
private int[] arr;
private static final int THRESHOLD = 20;
public CustomRecursiveTask(int[] arr) {
this.arr = arr;
}
@Override
protected Integer compute() {
if (arr.length > THRESHOLD) {
return ForkJoinTask.invokeAll(createSubtasks())
.stream()
.mapToInt(ForkJoinTask::join)
.sum();
} else {
return processing(arr);
}
}
private Collection<CustomRecursiveTask> createSubtasks() {
List<CustomRecursiveTask> dividedTasks = new ArrayList<>();
dividedTasks.add(new CustomRecursiveTask(
Arrays.copyOfRange(arr, 0, arr.length / 2)));
dividedTasks.add(new CustomRecursiveTask(
Arrays.copyOfRange(arr, arr.length / 2, arr.length)));
return dividedTasks;
}
private Integer processing(int[] arr) {
return Arrays.stream(arr)
.filter(a -> a > 10 && a < 27)
.map(a -> a * 10)
.sum();
}
}

10
core-java-8/src/main/java/com/baeldung/forkjoin/util/PoolUtil.java Normal file
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@ -0,0 +1,10 @@
package com.baeldung.forkjoin.util;
import java.util.concurrent.ForkJoinPool;
public class PoolUtil {
public static ForkJoinPool forkJoinPool = new ForkJoinPool(2);
}

2
core-java-8/src/main/java/com/baeldung/unzip/UnzipFile.java
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@ -13,7 +13,7 @@ public class UnzipFile {
final byte[] buffer = new byte[1024];
final ZipInputStream zis = new ZipInputStream(new FileInputStream(fileZip));
ZipEntry zipEntry = zis.getNextEntry();
while(zipEntry != null){
while (zipEntry != null) {
final String fileName = zipEntry.getName();
final File newFile = new File("src/main/resources/unzipTest/" + fileName);
final FileOutputStream fos = new FileOutputStream(newFile);

2
core-java-8/src/main/java/com/baeldung/zip/ZipFile.java
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@ -18,7 +18,7 @@ public class ZipFile {
zipOut.putNextEntry(zipEntry);
final byte[] bytes = new byte[1024];
int length;
while((length = fis.read(bytes)) >= 0) {
while ((length = fis.read(bytes)) >= 0) {
zipOut.write(bytes, 0, length);
}
zipOut.close();

2
core-java-8/src/main/java/com/baeldung/zip/ZipMultipleFiles.java
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@ -22,7 +22,7 @@ public class ZipMultipleFiles {
final byte[] bytes = new byte[1024];
int length;
while((length = fis.read(bytes)) >= 0) {
while ((length = fis.read(bytes)) >= 0) {
zipOut.write(bytes, 0, length);
}
fis.close();

2
core-java-8/src/main/resources/logback.xml
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@ -10,7 +10,7 @@
<!-- <logger name="org.springframework" level="WARN" /> -->
<root level="INFO">
<appender-ref ref="STDOUT" />
<appender-ref ref="STDOUT"/>
</root>
</configuration>

4
core-java-8/src/test/java/com/baeldung/doublecolon/TestComputerUtils.java
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@ -6,7 +6,9 @@ import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import java.util.*;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.function.BiFunction;
import static com.baeldung.doublecolon.ComputerUtils.*;

9
core-java-8/src/test/java/com/baeldung/java8/Java8CollectionCleanupUnitTest.java
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@ -1,14 +1,13 @@
package com.baeldung.java8;
import static org.hamcrest.Matchers.hasSize;
import static org.junit.Assert.assertThat;
import com.google.common.collect.Lists;
import org.junit.Test;
import java.util.List;
import java.util.stream.Collectors;
import org.junit.Test;
import com.google.common.collect.Lists;
import static org.hamcrest.Matchers.hasSize;
import static org.junit.Assert.assertThat;
public class Java8CollectionCleanupUnitTest {

5
core-java-8/src/test/java/com/baeldung/java8/Java8ExecutorServiceTest.java
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@ -7,6 +7,7 @@ import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.*;
import static org.junit.Assert.*;
@ -53,8 +54,8 @@ public class Java8ExecutorServiceTest {
public void creationSubmittingTasksShuttingDownNow_whenShutDownAfterAwating_thenCorrect() {
ExecutorService threadPoolExecutor =
new ThreadPoolExecutor(1, 1, 0L, TimeUnit.MILLISECONDS,
new LinkedBlockingQueue<>());
new ThreadPoolExecutor(1, 1, 0L, TimeUnit.MILLISECONDS,
new LinkedBlockingQueue<>());
for (int i = 0; i < 100; i++) {
threadPoolExecutor.submit(callableTask);

100
core-java-8/src/test/java/com/baeldung/java8/Java8ForkJoinTest.java Normal file
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@ -0,0 +1,100 @@
package com.baeldung.java8;
import com.baeldung.forkjoin.CustomRecursiveAction;
import com.baeldung.forkjoin.CustomRecursiveTask;
import com.baeldung.forkjoin.util.PoolUtil;
import org.junit.Before;
import org.junit.Test;
import java.util.Random;
import java.util.concurrent.ForkJoinPool;
import static org.junit.Assert.*;
public class Java8ForkJoinTest {
private int[] arr;
private CustomRecursiveTask customRecursiveTask;
@Before
public void init() {
Random random = new Random();
arr = new int[50];
for (int i = 0; i < arr.length; i++) {
arr[i] = random.nextInt(35);
}
customRecursiveTask = new CustomRecursiveTask(arr);
}
@Test
public void callPoolUtil_whenExistsAndExpectedType_thenCorrect() {
ForkJoinPool forkJoinPool = PoolUtil.forkJoinPool;
ForkJoinPool forkJoinPoolTwo = PoolUtil.forkJoinPool;
assertNotNull(forkJoinPool);
assertEquals(2, forkJoinPool.getParallelism());
assertEquals(forkJoinPool, forkJoinPoolTwo);
}
@Test
public void callCommonPool_whenExistsAndExpectedType_thenCorrect() {
ForkJoinPool commonPool = ForkJoinPool.commonPool();
ForkJoinPool commonPoolTwo = ForkJoinPool.commonPool();
assertNotNull(commonPool);
assertEquals(commonPool, commonPoolTwo);
}
@Test
public void executeRecursiveAction_whenExecuted_thenCorrect() {
CustomRecursiveAction myRecursiveAction = new CustomRecursiveAction("ddddffffgggghhhh");
ForkJoinPool.commonPool().invoke(myRecursiveAction);
assertTrue(myRecursiveAction.isDone());
}
@Test
public void executeRecursiveTask_whenExecuted_thenCorrect() {
ForkJoinPool forkJoinPool = ForkJoinPool.commonPool();
forkJoinPool.execute(customRecursiveTask);
int result = customRecursiveTask.join();
assertTrue(customRecursiveTask.isDone());
forkJoinPool.submit(customRecursiveTask);
int resultTwo = customRecursiveTask.join();
assertTrue(customRecursiveTask.isDone());
}
@Test
public void executeRecursiveTaskWithFJ_whenExecuted_thenCorrect() {
CustomRecursiveTask customRecursiveTaskFirst = new CustomRecursiveTask(arr);
CustomRecursiveTask customRecursiveTaskSecond = new CustomRecursiveTask(arr);
CustomRecursiveTask customRecursiveTaskLast = new CustomRecursiveTask(arr);
customRecursiveTaskFirst.fork();
customRecursiveTaskSecond.fork();
customRecursiveTaskLast.fork();
int result = 0;
result += customRecursiveTaskLast.join();
result += customRecursiveTaskSecond.join();
result += customRecursiveTaskFirst.join();
assertTrue(customRecursiveTaskFirst.isDone());
assertTrue(customRecursiveTaskSecond.isDone());
assertTrue(customRecursiveTaskLast.isDone());
assertTrue(result != 0);
}
}

15
core-java-8/src/test/java/com/baeldung/java8/Java8FunctionalInteracesLambdasTest.java
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@ -1,16 +1,15 @@
package com.baeldung.java8;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import java.util.function.Function;
import org.junit.Before;
import org.junit.Test;
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 Java8FunctionalInteracesLambdasTest {

13
core-java-8/src/test/java/com/baeldung/java8/Java8SortUnitTest.java
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@ -1,17 +1,16 @@
package com.baeldung.java8;
import static org.hamcrest.Matchers.equalTo;
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 org.junit.Assert;
import org.junit.Test;
import com.baeldung.java8.entity.Human;
import com.google.common.collect.Lists;
import com.google.common.primitives.Ints;
import static org.hamcrest.Matchers.equalTo;
public class Java8SortUnitTest {

16
core-java-8/src/test/java/com/baeldung/java8/JavaFolderSizeTest.java
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@ -1,22 +1,18 @@
package com.baeldung.java8;
import static org.junit.Assert.assertEquals;
import org.apache.commons.io.FileUtils;
import org.junit.Before;
import org.junit.Test;
import java.io.File;
import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.text.DecimalFormat;
import java.util.concurrent.atomic.AtomicLong;
import java.util.stream.StreamSupport;
import org.apache.commons.io.FileUtils;
import org.junit.Before;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class JavaFolderSizeTest {
@ -93,7 +89,7 @@ public class JavaFolderSizeTest {
final File folder = new File(path);
final long size = getFolderSize(folder);
final String[] units = new String[] { "B", "KB", "MB", "GB", "TB" };
final String[] units = new String[]{"B", "KB", "MB", "GB", "TB"};
final int unitIndex = (int) (Math.log10(size) / 3);
final double unitValue = 1 << (unitIndex * 10);

6
core-java-8/src/test/java/com/baeldung/java8/JavaTryWithResourcesTest.java
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@ -1,13 +1,13 @@
package com.baeldung.java8;
import org.junit.Assert;
import org.junit.Test;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Date;
import java.util.Scanner;
import org.junit.Assert;
import org.junit.Test;
public class JavaTryWithResourcesTest {
private static final String TEST_STRING_HELLO_WORLD = "Hello World";

10
core-java-8/src/test/java/com/baeldung/java8/base64/ApacheCommonsEncodeDecodeTest.java
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@ -1,14 +1,12 @@
package com.baeldung.java8.base64;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertNotNull;
import java.io.UnsupportedEncodingException;
import org.apache.commons.codec.binary.Base64;
import org.junit.Test;
import java.io.UnsupportedEncodingException;
import static org.junit.Assert.*;
public class ApacheCommonsEncodeDecodeTest {
// tests

6
core-java-8/src/test/java/com/baeldung/java8/base64/Java8EncodeDecodeTest.java
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@ -1,14 +1,12 @@
package com.baeldung.java8.base64;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertNotNull;
import org.junit.Test;
import java.io.UnsupportedEncodingException;
import java.util.Base64;
import java.util.UUID;
import org.junit.Test;
import static org.junit.Assert.*;
public class Java8EncodeDecodeTest {