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BAEL-4572: Add List#copyOf and Set#copyOf (eugenp#9903)
* BAEL-4572: Move Converting Between a List and a Set in Java to core-java-10 * BAEL-4572: Add Java10 examples
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‎core-java-modules/core-java-10/README.md‎

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- [Copy a List to Another List in Java](http://www.baeldung.com/java-copy-list-to-another)
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- [Deep Dive Into the New Java JIT Compiler – Graal](https://www.baeldung.com/graal-java-jit-compiler)
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- [Copying Sets in Java](https://www.baeldung.com/java-copy-sets)
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- [Converting between a List and a Set in Java](https://www.baeldung.com/convert-list-to-set-and-set-to-list)

‎core-java-modules/core-java-10/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project
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xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-10</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-10</name>
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<packaging>jar</packaging>
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<url>http://maven.apache.org</url>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-modules</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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<relativePath>../../</relativePath>
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<groupId>com.baeldung.core-java-modules</groupId>
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<artifactId>core-java-modules</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../</relativePath>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-collections4</artifactId>
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<version>${commons-collections4.version}</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<properties>
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<maven.compiler.source.version>10</maven.compiler.source.version>
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<maven.compiler.target.version>10</maven.compiler.target.version>
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<commons-collections4.version>4.1</commons-collections4.version>
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</properties>
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</project>

‎core-java-modules/core-java-10/src/test/java/com/baeldung/java10/collections/conversion/ListSetConversionUnitTest.java‎

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package com.baeldung.java10.collections.conversion;
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import com.google.common.collect.Lists;
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import com.google.common.collect.Sets;
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import org.apache.commons.collections4.CollectionUtils;
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import org.junit.Test;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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public class ListSetConversionUnitTest {
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// Set -> List; List -> Set
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@Test
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public final void givenUsingCoreJava_whenSetConvertedToList_thenCorrect() {
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final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
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final List<Integer> targetList = new ArrayList<>(sourceSet);
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}
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@Test
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public final void givenUsingCoreJava_whenListConvertedToSet_thenCorrect() {
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final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
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final Set<Integer> targetSet = new HashSet<>(sourceList);
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}
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@Test
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public void givenUsingJava10_whenSetConvertedToList_thenCorrect() {
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final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
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final List<Integer> targetList = List.copyOf(sourceSet);
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}
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@Test
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public void givenUsingJava10_whenListConvertedToSet_thenCorrect() {
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final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
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final Set<Integer> targetSet = Set.copyOf(sourceList);
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}
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@Test
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public final void givenUsingGuava_whenSetConvertedToList_thenCorrect() {
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final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
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final List<Integer> targetList = Lists.newArrayList(sourceSet);
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}
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@Test
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public final void givenUsingGuava_whenListConvertedToSet_thenCorrect() {
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final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
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final Set<Integer> targetSet = Sets.newHashSet(sourceList);
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}
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@Test
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public final void givenUsingCommonsCollections_whenListConvertedToSet_thenCorrect() {
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final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
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final Set<Integer> targetSet = new HashSet<>(6);
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CollectionUtils.addAll(targetSet, sourceList);
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}
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@Test
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public final void givenUsingCommonsCollections_whenSetConvertedToList_thenCorrect() {
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final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
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final List<Integer> targetList = new ArrayList<>(6);
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CollectionUtils.addAll(targetList, sourceSet);
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}
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}

‎java-collections-conversions/README.md‎

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### Relevant Articles:
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- [Converting between an Array and a List in Java](https://www.baeldung.com/convert-array-to-list-and-list-to-array)
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- [Converting between an Array and a Set in Java](https://www.baeldung.com/convert-array-to-set-and-set-to-array)
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- [Converting between a List and a Set in Java](https://www.baeldung.com/convert-list-to-set-and-set-to-list)
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- [Convert a Map to an Array, List or Set in Java](https://www.baeldung.com/convert-map-values-to-array-list-set)
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- [Converting a List to String in Java](https://www.baeldung.com/java-list-to-string)
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- [How to Convert List to Map in Java](https://www.baeldung.com/java-list-to-map)

‎java-collections-conversions/src/test/java/com/baeldung/java/collections/JavaCollectionConversionUnitTest.java‎

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final int[] primitiveTargetArray = ArrayUtils.toPrimitive(targetArray);
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}
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// Set -> List; List -> Set
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public final void givenUsingCoreJava_whenSetConvertedToList_thenCorrect() {
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final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
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final List<Integer> targetList = new ArrayList<>(sourceSet);
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}
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public final void givenUsingCoreJava_whenListConvertedToSet_thenCorrect() {
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final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
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final Set<Integer> targetSet = new HashSet<>(sourceList);
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}
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public final void givenUsingGuava_whenSetConvertedToList_thenCorrect() {
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final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
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final List<Integer> targetList = Lists.newArrayList(sourceSet);
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}
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public final void givenUsingGuava_whenListConvertedToSet_thenCorrect() {
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final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
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final Set<Integer> targetSet = Sets.newHashSet(sourceList);
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}
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public final void givenUsingCommonsCollections_whenListConvertedToSet_thenCorrect() {
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final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
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final Set<Integer> targetSet = new HashSet<>(6);
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CollectionUtils.addAll(targetSet, sourceList);
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}
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public final void givenUsingCommonsCollections_whenSetConvertedToList_thenCorrect() {
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final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
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final List<Integer> targetList = new ArrayList<>(6);
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CollectionUtils.addAll(targetList, sourceSet);
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}
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// Map (values) -> Array, List, Set
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@Test

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