EnumMap的使用

基础使用

 

package com.ojxchen;

import java.util.EnumMap;

public class EnumMapTest {

    enum Color {
        RED, GREEN, BLUE
    }
    public static void main(String[] args) {
        EnumMap<Color, Object> enumMap = new EnumMap<>(Color.class);
        enumMap.put(Color.RED, "red");
        enumMap.put(Color.GREEN, "green");
        enumMap.put(Color.BLUE, "blue");
        enumMap.forEach((k, v) -> System.out.println(k + ":" + v));
    }
}

 

高级使用

 

package com.ojxchen;

import java.util.EnumMap;

interface Command {
    void execute();
}

class StartCommand implements Command{
    @Override
    public void execute() {
        System.out.println("Start command executed");
    }
}

class StopCommand implements Command{
    @Override
    public void execute() {
        System.out.println("Stop command executed");
    }
}

enum CommandType {
    START,
    STOP
}

public class CommandExample {
    private static final EnumMap<CommandType, Command> commandMap = new EnumMap<>(CommandType.class);

    static {
        commandMap.put(CommandType.START, new StartCommand());
        commandMap.put(CommandType.STOP, new StopCommand());
    }

    public static void main(String[] args) {
        Command command = commandMap.get(CommandType.START);
        command.execute();
        command = commandMap.get(CommandType.STOP);
        command.execute();
    }
}