8000 Objects, immutability and switch expressions · pennli/Java-Coding-Problems@8f100d7 · GitHub
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Objects, immutability and switch expressions
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  • Main.java
  • Player.java
  • SnookerPlayer.java
  • TennisPlayer.java
  • UnknownPlayerException.java

    • 16 files changed

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    lines changed

    ‎Chapter02/P55_JDK13_SwitchExpression/nbactions.xml

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    <actions>
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    <actionName>run</actionName>
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    <packagings>
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    <packaging>jar</packaging>
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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 ${packageClassName}</exec.args>
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    <exec.executable>java</exec.executable>
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    </properties>
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    </action>
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    <actionName>debug</actionName>
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    <packaging>jar</packaging>
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    </packagings>
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    <goals>
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    <goal>process-classes</goal>
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    <goal>org.codehaus.mojo:exec-maven-plugin:1.5.0:exec</goal>
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    </goals>
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    <properties>
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    <exec.args>--enable-preview -agentlib:jdwp=transport=dt_socket,server=n,address=${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>j B422 ava</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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    F438 <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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    <actionName>run</actionName>
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    <packagings>
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    <packaging>jar</packaging>
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    <exec.executable>java</exec.executable>
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    </action>
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    <actionName>profile</actionName>
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    <exec.executable>java</exec.executable>
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    ‎Chapter02/P57_JDK13_StatementBlocks/pom.xml

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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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    </properties>
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    <name>P57_JDK13_StatementBlocks</name>
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    </project>

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