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mbarriolambarriola
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Java 5065 (eugenp#11126)
* Commit source code to branch * BAEL-5065 improvement of groupBy with complex key
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5 files changed

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‎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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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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<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>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<dependencies>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<version>3.12.0</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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<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>${maven.compiler.target.version}</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>${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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<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/main/java/com/baeldung/java_16_features/groupingby/BlogPost.java‎

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package com.baeldung.java_16_features.groupingby;
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public class BlogPost {
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private String title;
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private String author;
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private BlogPostType type;
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private int likes;
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record AuthPostTypesLikes(String author, BlogPostType type, int likes) {};
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public BlogPost(String title, String author, BlogPostType type, int likes) {
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this.title = title;
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this.author = author;
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this.type = type;
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this.likes = likes;
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}
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public String getTitle() {
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return title;
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}
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public String getAuthor() {
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return author;
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}
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public BlogPostType getType() {
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return type;
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}
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public int getLikes() {
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return likes;
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}
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@Override
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public String toString() {
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return "BlogPost{" + "title='" + title + '\'' + ", type=" + type + ", likes=" + likes + '}';
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}
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}

‎core-java-modules/core-java-16/src/main/java/com/baeldung/java_16_features/groupingby/BlogPostType.java‎

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package com.baeldung.java_16_features.groupingby;
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public enum BlogPostType {
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NEWS, REVIEW, GUIDE
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}

‎core-java-modules/core-java-16/src/main/java/com/baeldung/java_16_features/groupingby/Tuple.java‎

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package com.baeldung.java_16_features.groupingby;
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import java.util.Objects;
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public class Tuple {
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private final BlogPostType type;
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private final String author;
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public Tuple(BlogPostType type, String author) {
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this.type = type;
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this.author = author;
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}
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public BlogPostType getType() {
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return type;
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}
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public String getAuthor() {
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return author;
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}
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@Override
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public boolean equals(Object o) {
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if (this == o)
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return true;
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if (o == null || getClass() != o.getClass())
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return false;
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Tuple tuple = (Tuple) o;
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return type == tuple.type && author.equals(tuple.author);
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}
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@Override
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public int hashCode() {
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return Objects.hash(type, author);
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}
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@Override
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public String toString() {
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return "Tuple{" + "type=" + type + ", author='" + author + '\'' + '}';
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}
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}

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