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BAEL-3476: Add Java 9 example to Immutable ArrayList in Java (#8636)
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‎core-java-modules/core-java-9/README.md‎

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- [Iterate Through a Range of Dates in Java](https://www.baeldung.com/java-iterate-date-range)
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- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
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- [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)
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- [Immutable ArrayList in Java](https://www.baeldung.com/java-immutable-list)
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Note: also contains part of the code for the article
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[How to Filter a Collection in Java](https://www.baeldung.com/java-collection-filtering).

‎core-java-modules/core-java-9/pom.xml‎

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<version>${junit.platform.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-collections4</artifactId>
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<version>${commons-collections4.version}</version>
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</dependency>
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</dependencies>
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<build>
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<maven.compiler.source>1.9</maven.compiler.source>
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<maven.compiler.target>1.9</maven.compiler.target>
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<guava.version>25.1-jre</guava.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-9/src/test/java/com/baeldung/java9/list/immutable/ImmutableArrayListUnitTest.java‎

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package com.baeldung.java9.list.immutable;
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import com.google.common.collect.ImmutableList;
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import org.apache.commons.collections4.ListUtils;
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import org.junit.Test;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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public class ImmutableArrayListUnitTest {
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@Test(expected = UnsupportedOperationException.class)
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public final void givenUsingTheJdk_whenUnmodifiableListIsCreated_thenNotModifiable() {
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final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
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final List<String> unmodifiableList = Collections.unmodifiableList(list);
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unmodifiableList.add("four");
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}
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@Test(expected = UnsupportedOperationException.class)
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public final void givenUsingTheJava9_whenUnmodifiableListIsCreated_thenNotModifiable() {
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final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
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final List<String> unmodifiableList = List.of(list.toArray(new String[]{}));
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unmodifiableList.add("four");
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}
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@Test(expected = UnsupportedOperationException.class)
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public final void givenUsingGuava_whenUnmodifiableListIsCreated_thenNotModifiable() {
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final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
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final List<String> unmodifiableList = ImmutableList.copyOf(list);
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unmodifiableList.add("four");
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}
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@Test(expected = UnsupportedOperationException.class)
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public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreated_thenNoLongerModifiable() {
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final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
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final ImmutableList<String> unmodifiableList = ImmutableList.<String>builder().addAll(list).build();
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unmodifiableList.add("four");
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}
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@Test(expected = UnsupportedOperationException.class)
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public final void givenUsingCommonsCollections_whenUnmodifiableListIsCreated_thenNotModifiable() {
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final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
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final List<String> unmodifiableList = ListUtils.unmodifiableList(list);
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unmodifiableList.add("four");
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}
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}

‎core-java-modules/core-java-collections-array-list/README.md‎

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This module contains articles about the Java ArrayList collection
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### Relevant Articles:
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- [Immutable ArrayList in Java](http://www.baeldung.com/java-immutable-list)
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- [Guide to the Java ArrayList](http://www.baeldung.com/java-arraylist)
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- [Add Multiple Items to an Java ArrayList](http://www.baeldung.com/java-add-items-array-list)
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- [Guide to the Java ArrayList](https://www.baeldung.com/java-arraylist)
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- [Add Multiple Items to an Java ArrayList](https://www.baeldung.com/java-add-items-array-list)
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- [ClassCastException: Arrays$ArrayList cannot be cast to ArrayList](https://www.baeldung.com/java-classcastexception-arrays-arraylist)
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- [Multi Dimensional ArrayList in Java](https://www.baeldung.com/java-multi-dimensional-arraylist)
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- [Removing an Element From an ArrayList](https://www.baeldung.com/java-arraylist-remove-element)

‎core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/collections/CoreJavaCollectionsUnitTest.java‎

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private static final Logger LOG = LoggerFactory.getLogger(CoreJavaCollectionsUnitTest.class);
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// tests -
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@Test
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public final void givenUsingTheJdk_whenArrayListIsSynchronized_thenCorrect() {
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final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
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final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
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final List<String> synchronizedList = Collections.synchronizedList(list);
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LOG.debug("Synchronized List is: " + synchronizedList);
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}
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@Test(expected = UnsupportedOperationException.class)
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public final void givenUsingTheJdk_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
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final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
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final List<String> unmodifiableList = Collections.unmodifiableList(list);
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unmodifiableList.add("four");
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}
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@Test(expected = UnsupportedOperationException.class)
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public final void givenUsingGuava_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
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final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
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final List<String> unmodifiableList = ImmutableList.copyOf(list);
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unmodifiableList.add("four");
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}
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@Test(expected = UnsupportedOperationException.class)
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public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
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final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
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final ImmutableList<String> unmodifiableList = ImmutableList.<String>builder().addAll(list).build();
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unmodifiableList.add("four");
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}
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@Test(expected = UnsupportedOperationException.class)
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public final void givenUsingCommonsCollections_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
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final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
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final List<String> unmodifiableList = ListUtils.unmodifiableList(list);
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unmodifiableList.add("four");
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}
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}

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