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();

}