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Nick
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Code samples for Java Switch Statement
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‎core-java-modules/core-java-13/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" 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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<groupId>com.baeldung</groupId>
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<artifactId>core-java-13</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-13</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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<release>13</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>3.0.0-M3</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>13</maven.compiler.source.version>
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<maven.compiler.target.version>13</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-13/src/test/java/com/baeldung/switchExpression/SwitchExpressionsUnitTest.java‎

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package com.baeldung.switchExpression;
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import static java.time.Month.AUGUST;
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import static java.time.Month.JUNE;
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import static org.junit.Assert.assertEquals;
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import java.time.Month;
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import java.util.function.Function;
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import org.junit.Test;
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public class SwitchExpressionsUnitTest {
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@Test
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@SuppressWarnings ("preview")
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public void switchExpression() {
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var month = JUNE;
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var result = switch (month) {
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case JANUARY, JUNE, JULY -> 3;
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case FEBRUARY, SEPTEMBER, OCTOBER, NOVEMBER, DECEMBER -> 1;
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case MARCH, MAY, APRIL -> 2;
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default -> 0;
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};
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assertEquals(result, 3);
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}
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@Test
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@SuppressWarnings ("preview")
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public void switchExpressionWithYieldKeyword() {
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var month = AUGUST;
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var result = switch (month) {
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case JANUARY, JUNE, JULY -> 3;
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case FEBRUARY, SEPTEMBER, OCTOBER, NOVEMBER, DECEMBER -> 1;
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case MARCH, MAY, APRIL, AUGUST -> {
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int monthLength = month.toString().length();
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yield monthLength * 4;
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}
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default -> 0;
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};
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assertEquals(24, result);
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}
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@Test
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@SuppressWarnings ("preview")
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public void switchStatementWithReturnInsideBlock() {
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Function<Month, Integer> func = (month) -> {
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switch (month) {
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case JANUARY, JUNE, JULY -> { return 3; }
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default -> { return 0; }
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}
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};
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assertEquals(Integer.valueOf(3), func.apply(Month.JANUARY));
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}
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@Test
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@SuppressWarnings ("preview")
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public void switchExpressionWithAllCasesCovered() {
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var month = AUGUST;
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var result = switch (month) {
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case JANUARY, JUNE, JULY -> 3;
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case FEBRUARY, SEPTEMBER, OCTOBER, NOVEMBER, DECEMBER -> 1;
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case MARCH, MAY, APRIL, AUGUST -> 2;
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};
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assertEquals(result, 2);
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}
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}

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