BAEL-6458: Guide to the yield Keyword in Java (#14440)
* BAEL-6229: committing new example for loading multiple yaml configuration files * BAEL-6229: updating README.md * BAEL-6229: adding example one code, commented out * Revert "BAEL-6229: updating README.md" This reverts commit 51cd2dcf97f797aa6a723888fd246ef0142242a3. * BAEL-6229: adding comments around commented out code for first example. * BAEL-6458: creating new module for conditionals and adding examples for yield * BAEL-6458: creating new module for conditionals and adding examples for yield * BAEL-6458: rename methods * BAEL-6458: clean up pom * BAEL-6458: convert checks to tests * BAEL-6458: convert checks to tests * BAEL-6458: convert checks to tests * BAEL-6458: move examples to just YieldTest and removed YieldExamples class. Also added assigning the value of the switch expression to a variable instead of returning from method. Also added a non-default exhaustive test. * BAEL-6458: Test clean up based on initial PR feedback.
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Alex Tighe
GitHub
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## Core Java Conditionals
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This module contains articles about Java Conditionals.
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### Relevant articles:
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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-conditionals</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-compiler</name>
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<packaging>jar</packaging>
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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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</parent>
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<dependencies>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>1.18.24</version>
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<scope>provided</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>${maven-compiler-plugin.version}</version>
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<configuration>
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<compilerArgs>--enable-preview</compilerArgs>
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<source>${maven.compiler.source.version}</source>
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<target>${maven.compiler.target.version}</target>
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<release>14</release>
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<compilerArgs>--enable-preview</compilerArgs>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>${surefire.plugin.version}</version>
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<configuration>
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<argLine>--enable-preview</argLine>
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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>14</maven.compiler.source.version>
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<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
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<maven.compiler.target.version>14</maven.compiler.target.version>
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<surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
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</properties>
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</project>
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package com.baeldung.conditionals;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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class YieldTest {
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enum Number {
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ONE, TWO, THREE, FOUR
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}
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@Test
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void whenSwitchingOnNumberOne_thenWillReturnString() {
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Number number = Number.ONE;
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String message;
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switch (number) {
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case ONE:
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message = "Got a 1";
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break;
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case TWO:
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message = "Got a 2";
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break;
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default:
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message = "More than 2";
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}
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assertEquals("Got a 1", message);
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}
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@Test
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void whenSwitchingWithArrowOnNumberTwo_thenWillReturnString() {
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Number number = Number.TWO;
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String message = switch (number) {
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case ONE -> {
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yield "Got a 1";
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}
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case TWO -> {
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yield "Got a 2";
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}
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default -> {
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yield "More than 2";
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}
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};
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assertEquals("Got a 2", message);
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}
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@Test
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void whenSwitchingWithArrowNoDefaultOnNumberTwo_thenWillReturnString() {
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Number number = Number.TWO;
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String message = switch (number) {
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case ONE -> {
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yield "Got a 1";
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}
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case TWO -> {
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yield "Got a 2";
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}
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case THREE, FOUR -> {
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yield "More than 2";
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}
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};
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assertEquals("Got a 2", message);
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}
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@Test
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void whenSwitchingWithColonOnNumberTwo_thenWillReturnString() {
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Number number = Number.TWO;
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String message = switch (number) {
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case ONE:
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yield "Got a 1";
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case TWO:
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yield "Got a 2";
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default:
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yield "More than 2";
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};
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assertEquals("Got a 2", message);
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}
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}
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