8000 Objects, immutability and switch expressions · dbc2201/Java-Coding-Problems@8f100d7 · GitHub
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Objects, immutability and switch expressions
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‎Chapter02/P55_JDK13_SwitchExpression/nbactions.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<actions>
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<action>
EDBE 4+
<actionName>run</actionName>
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<packagings>
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<packaging>jar</packaging>
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</packagings>
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<goals>
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<goal>process-classes</goal>
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<goal>org.codehaus.mojo:exec-maven-plugin:1.5.0:exec</goal>
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</goals>
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<properties>
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<exec.args>--enable-preview -classpath %classpath ${packageClassName}</exec.args>
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<exec.executable>java</exec.executable>
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</properties>
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</action>
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<action>
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<actionName>debug</actionName>
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<packagings>
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<packaging>jar</packaging>
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</packagings>
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<goals>
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<goal>process-classes</goal>
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<goal>org.codehaus.mojo:exec-maven-plugin:1.5.0:exec</goal>
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</goals>
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<properties>
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<exec.args>--enable-preview -agentlib:jdwp=transport=dt_socket,server=n,address=${jpda.address} -classpath %classpath ${packageClassName}</exec.args>
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<exec.executable>java</exec.executable>
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<jpda.listen>true</jpda.listen>
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</properties>
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</action>
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<action>
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<actionName>profile</actionName>
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<packagings>
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<packaging>jar</packaging>
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</packagings>
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<goals>
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<goal>process-classes</goal>
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<goal>org.codehaus.mojo:exec-maven-plugin:1.5.0:exec</goal>
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</goals>
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<properties>
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<exec.args>--enable-preview -classpath %classpath ${packageClassName}</exec.args>
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<exec.executable>java</exec.executable>
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</properties>
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</action>
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</actions>

‎Chapter02/P55_JDK13_SwitchExpression/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" 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>modern.challenge</groupId>
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<artifactId>P55_JDK13_SwitchExpression</artifactId>
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<version>1.0</version>
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<packaging>jar</packaging>
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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>3.3</version>
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<configuration>
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<compilerArgs>
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<arg>--enable-preview</arg>
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</compilerArgs>
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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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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>13</maven.compiler.source>
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<maven.compiler.target>13</maven.compiler.target>
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</properties>
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<name>P55_JDK13_SwitchExpression</name>
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</project>

‎Chapter02/P55_JDK13_SwitchExpression/src/main/java/modern/challenge/FootballPlayer.java

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package modern.challenge;
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public class FootballPlayer extends Player {
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}

‎Chapter02/P55_JDK13_SwitchExpression/src/main/java/modern/challenge/Main.java

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package modern.challenge;
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public class Main {
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public enum PlayerTypes {
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TENNIS,
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FOOTBALL,
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SNOOKER,
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UNKNOWN
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}
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public static void main(String[] args) {
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// switch statement
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Player playerSwitchStatementUgly = createPlayerSwitchStatementUgly(PlayerTypes.TENNIS);
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Player playerSwitchStatementNice = createPlayerSwitchStatementNice(PlayerTypes.TENNIS);
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// switch expression
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Player playerSwitchExpression = createPlayerSwitchExpression(PlayerTypes.TENNIS);
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Player playerSwitchExpressionYield = createPlayerSwitchExpressionBreak(PlayerTypes.TENNIS);
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}
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private static Player createPlayerSwitchStatementUgly(PlayerTypes playerType) {
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Player player = null;
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switch (playerType) {
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case TENNIS:
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player = new TennisPlayer();
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break;
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case FOOTBALL:
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player = new FootballPlayer();
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break;
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case SNOOKER:
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player = new SnookerPlayer();
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break;
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case UNKNOWN:
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throw new UnknownPlayerException("Player type is unknown");
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default:
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throw new IllegalArgumentException("Invalid player type: " + playerType);
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}
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return player;
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}
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private static Player createPlayerSwitchStatementNice(PlayerTypes playerType) {
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switch (playerType) {
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case TENNIS:
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return new TennisPlayer();
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case FOOTBALL:
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return new FootballPlayer();
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case SNOOKER:
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return new SnookerPlayer();
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case UNKNOWN:
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throw new UnknownPlayerException("Player type is unknown");
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default:
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throw new IllegalArgumentException("Invalid player type: " + playerType);
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}
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}
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private static Player createPlayerSwitchExpression(PlayerTypes playerType) {
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return switch (playerType) {
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case TENNIS->
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new TennisPlayer();
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case FOOTBALL->
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new FootballPlayer();
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case SNOOKER->
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new SnookerPlayer();
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case UNKNOWN->
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throw new UnknownPlayerException("Player type is unknown");
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// default is not mandatory
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default->
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throw new IllegalArgumentException("Invalid player type: " + playerType);
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};
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}
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private static Player createPlayerSwitchExpressionBreak(PlayerTypes playerType) {
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return switch (playerType) {
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case TENNIS:
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yield new TennisPlayer();
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case FOOTBALL:
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yield new FootballPlayer();
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case SNOOKER:
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yield new SnookerPlayer();
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case UNKNOWN:
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throw new UnknownPlayerException("Player type is unknown");
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// default is not mandatory
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default:
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throw new IllegalArgumentException("Invalid player type: " + playerType);
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};
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}
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}

‎Chapter02/P55_JDK13_SwitchExpression/src/main/java/modern/challenge/Player.java

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package modern.challenge;
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public class Player {
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}

‎Chapter02/P55_JDK13_SwitchExpression/src/main/java/modern/challenge/SnookerPlayer.java

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package modern.challenge;
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public class SnookerPlayer extends Player {
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}

‎Chapter02/P55_JDK13_SwitchExpression/src/main/java/modern/challenge/TennisPlayer.java

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package modern.challenge;
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public class TennisPlayer extends Player{
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}

‎Chapter02/P55_JDK13_SwitchExpression/src/main/java/modern/challenge/UnknownPlayerException.java

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package modern.challenge;
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public class UnknownPlayerException extends RuntimeException {
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private static final long serialVersionUID = 1L;
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public UnknownPlayerException() {
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super();
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}
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public UnknownPlayerException(String message) {
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super(message);
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}
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public UnknownPlayerException(Throwable cause) {
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super(cause);
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}
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public UnknownPlayerException(String message, Throwable cause) {
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super(message, cause);
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}
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}

‎Chapter02/P57_JDK13_StatementBlocks/nbactions.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<actions>
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<action>
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<actionName>run</actionName>
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<packagings>
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<packaging>jar</packaging>
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</packagings>
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<goals>
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<goal>process-classes</goal>
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<goal>org.codehaus.mojo:exec-maven-plugin:1.5.0:exec</goal>
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</goals>
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<properties>
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<exec.args>--enable-preview -classpath %classpath ${packageClassName}</exec.args>
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<exec.executable>java</exec.executable>
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</properties>
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</action>
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<action>
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<actionName>debug</actionName>
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<packagings>
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<packaging>jar</packaging>
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</packagings>
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<goals>
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<goal>process-classes</goal>
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<goal>org.codehaus.mojo:exec-maven-plugin:1.5.0:exec</goal>
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</goals>
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<properties>
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<exec.args>--enable-preview -agentlib:jdwp=transport=dt_socket,server=n,address=${jpda.address} -classpath %classpath ${packageClassName}</exec.args>
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<exec.executable>java</exec.executable>
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<jpda.listen>true</jpda.listen>
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</properties>
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</action>
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<action>
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<actionName>profile</actionName>
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<packagings>
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<packaging>jar</packaging>
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</packagings>
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<goals>
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<goal>process-classes</goal>
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<goal>org.codehaus.mojo:exec-maven-plugin:1.5.0:exec</goal>
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</goals>
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<properties>
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<exec.args>--enable-preview -classpath %classpath ${packageClassName}</exec.args>
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<exec.executable>java</exec.executable>
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</properties>
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</action>
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</actions>

‎Chapter02/P57_JDK13_StatementBlocks/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" 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>modern.challenge</groupId>
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<artifactId>P57_JDK13_StatementBlocks</artifactId>
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<version>1.0</version>
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<packaging>jar</packaging>
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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>3.3</version>
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<configuration>
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<compilerArgs>
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<arg>--enable-preview</arg>
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</compilerArgs>
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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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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>13</maven.compiler.source>
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<maven.compiler.target>13</maven.compiler.target>
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</properties>
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<name>P57_JDK13_StatementBlocks</name>
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</project>

‎Chapter02/P57_JDK13_StatementBlocks/src/main/java/modern/challenge/FootballPlayer.java

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package modern.challenge;
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public class FootballPlayer extends Player {
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}

‎Chapter02/P57_JDK13_StatementBlocks/src/main/java/modern/challenge/Main.java

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package modern.challenge;
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public class Main {
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public enum PlayerTypes {
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TENNIS,
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FOOTBALL,
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SNOOKER
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}
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public static void main(String[] args) {
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Player player = createPlayer(PlayerTypes.SNOOKER);
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}
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private static Player createPlayer(PlayerTypes playerType) {
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return switch (playerType) {
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case TENNIS-> {
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System.out.println("Creating a TennisPlayer ...");
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yield new TennisPlayer();
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}
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case FOOTBALL-> {
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System.out.println("Creating a FootballPlayer ...");
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yield new FootballPlayer();
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}
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case SNOOKER-> {
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System.out.println("Creating a SnookerPlayer ...");
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yield new SnookerPlayer();
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}
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default->
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throw new IllegalArgumentException("Invalid player type: " + playerType);
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};
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}
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}

‎Chapter02/P57_JDK13_StatementBlocks/src/main/java/ 10000 modern/challenge/Player.java

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package modern.challenge;
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public class Player {
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}

‎Chapter02/P57_JDK13_StatementBlocks/src/main/java/modern/challenge/SnookerPlayer.java

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package modern.challenge;
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public class SnookerPlayer extends Player {
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}

‎Chapter02/P57_JDK13_StatementBlocks/src/main/java/modern/challenge/TennisPlayer.java

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package modern.challenge;
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public class TennisPlayer extends Player{
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}

‎Chapter02/P57_JDK13_StatementBlocks/src/main/java/modern/challenge/UnknownPlayerException.java

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package modern.challenge;
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public class UnknownPlayerException extends RuntimeException {
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private static final long serialVersionUID = 1L;
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public UnknownPlayerException() {
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super();
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}
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public UnknownPlayerException(String message) {
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super(message);
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}
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public UnknownPlayerException(Throwable cause) {
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super(cause);
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}
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public UnknownPlayerException(String message, Throwable cause) {
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super(message, cause);
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}
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}

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