EnumMap demo

优点：常量做为Key，在编译期就确定了。Enum做为key，在运行时也可以改变

package enumdemo;

import java.util.EnumMap;
import java.util.Map;
import java.util.Set;

public class EnumMaps {
    public static void main(String[] args) {
        EnumMap<AlarmPoints, Command> em = new EnumMap<AlarmPoints, Command>(AlarmPoints.class);
        em.put(AlarmPoints.KITCHEN, new Command() {
            @Override
            public void action() {
                System.out.println("action:kitchen...");
            }
        });
        em.put(AlarmPoints.BATHROOM, new Command() {
            @Override
            public void action() {
                System.out.println("action:bathroom");
            }
        });


        Set<Map.Entry<AlarmPoints, Command>> set = em.entrySet();
        for (Map.Entry<AlarmPoints, Command> entry : set) {
            System.out.println(entry.getKey() + "");
            entry.getValue().action();
        }

        System.out.println(em.get(AlarmPoints.UTILITY) + "");


    }
}

enum AlarmPoints {
    KITCHEN,
    BATHROOM,
    UTILITY
}

interface Command {
    void action();
}