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BAEL-4969: Improvement: Streams to Immutable Collections (eugenp#11026)
* add new module for java core 16 * format pom.xml
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‎core-java-modules/core-java-16/README.md‎

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### Relevant articles:
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- [Collect a Java Stream to an Immutable Collection](https://www.baeldung.com/java-stream-immutable-collection)

‎core-java-modules/core-java-16/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project 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-16</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-16</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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</parent>
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<dependencies>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>${maven-compiler-plugin.version}</version>
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<configuration>
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<source>${maven.compiler.source.version}</source>
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<target>${maven.compiler.target.version}</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<properties>
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<maven.compiler.source.version>16</maven.compiler.source.version>
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<maven.compiler.target.version>16</maven.compiler.target.version>
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<assertj.version>3.6.1</assertj.version>
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</properties>
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</project>

‎core-java-modules/core-java-16/src/test/java/com/baeldung/streams/StreamToImmutableUnitTest.java‎

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package com.baeldung.streams;
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import java.util.List;
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import java.util.stream.Stream;
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import org.junit.jupiter.api.Assertions;
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import org.junit.jupiter.api.Test;
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public class StreamToImmutableUnitTest {
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@Test
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public void whenUsingStreamToList_thenReturnImmutableList() {
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List<String> immutableList = Stream.of("a", "b", "c", "d")
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.toList();
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Assertions.assertThrows(UnsupportedOperationException.class, () -> {
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immutableList.add("e");
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});
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}
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}

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