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BAEL-3476: Add Java 9 example to Immutable ArrayList in Java (#8636)

This commit is contained in:
kwoyke 2020-01-31 21:55:19 +01:00 committed by GitHub
parent fd17eaac04
commit cdac6f117a
5 changed files with 58 additions and 35 deletions
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1
core-java-modules/core-java-9/README.md
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@ -9,6 +9,7 @@ This module contains articles about Java 9 core features
- [Iterate Through a Range of Dates in Java](https://www.baeldung.com/java-iterate-date-range)
- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
- [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)
- [Immutable ArrayList in Java](https://www.baeldung.com/java-immutable-list)
Note: also contains part of the code for the article
[How to Filter a Collection in Java](https://www.baeldung.com/java-collection-filtering).

6
core-java-modules/core-java-9/pom.xml
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@ -37,6 +37,11 @@
<version>${junit.platform.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
</dependencies>
<build>
@ -69,6 +74,7 @@
<maven.compiler.source>1.9</maven.compiler.source>
<maven.compiler.target>1.9</maven.compiler.target>
<guava.version>25.1-jre</guava.version>
<commons-collections4.version>4.1</commons-collections4.version>
</properties>
</project>

48
core-java-modules/core-java-9/src/test/java/com/baeldung/java9/list/immutable/ImmutableArrayListUnitTest.java Normal file
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@ -0,0 +1,48 @@
package com.baeldung.java9.list.immutable;
import com.google.common.collect.ImmutableList;
import org.apache.commons.collections4.ListUtils;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
public class ImmutableArrayListUnitTest {
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingTheJdk_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = Collections.unmodifiableList(list);
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingTheJava9_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = List.of(list.toArray(new String[]{}));
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuava_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = ImmutableList.copyOf(list);
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreated_thenNoLongerModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final ImmutableList<String> unmodifiableList = ImmutableList.<String>builder().addAll(list).build();
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingCommonsCollections_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = ListUtils.unmodifiableList(list);
unmodifiableList.add("four");
}
}

5
core-java-modules/core-java-collections-array-list/README.md
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@ -3,9 +3,8 @@
This module contains articles about the Java ArrayList collection
### Relevant Articles:
- [Immutable ArrayList in Java](http://www.baeldung.com/java-immutable-list)
- [Guide to the Java ArrayList](http://www.baeldung.com/java-arraylist)
- [Add Multiple Items to an Java ArrayList](http://www.baeldung.com/java-add-items-array-list)
- [Guide to the Java ArrayList](https://www.baeldung.com/java-arraylist)
- [Add Multiple Items to an Java ArrayList](https://www.baeldung.com/java-add-items-array-list)
- [ClassCastException: Arrays$ArrayList cannot be cast to ArrayList](https://www.baeldung.com/java-classcastexception-arrays-arraylist)
- [Multi Dimensional ArrayList in Java](https://www.baeldung.com/java-multi-dimensional-arraylist)
- [Removing an Element From an ArrayList](https://www.baeldung.com/java-arraylist-remove-element)

33
core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/collections/CoreJavaCollectionsUnitTest.java
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@ -15,42 +15,11 @@ public class CoreJavaCollectionsUnitTest {
private static final Logger LOG = LoggerFactory.getLogger(CoreJavaCollectionsUnitTest.class);
// tests -
@Test
public final void givenUsingTheJdk_whenArrayListIsSynchronized_thenCorrect() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> synchronizedList = Collections.synchronizedList(list);
LOG.debug("Synchronized List is: " + synchronizedList);
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingTheJdk_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = Collections.unmodifiableList(list);
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuava_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = ImmutableList.copyOf(list);
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
final ImmutableList<String> unmodifiableList = ImmutableList.<String>builder().addAll(list).build();
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingCommonsCollections_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = ListUtils.unmodifiableList(list);
unmodifiableList.add("four");
}
}