Java抽象類模板設計模式

例如，現在有三類事物： 
（1）機器人：充電，工作； 
（2）人：喫飯，工作，睡覺； 
（3）豬：進食，睡覺。 
現要求實現一個程序，可以實現三種不同事物的行爲

package com.demo;

/**
 * Created by Ranjx on 2018/7/22.
 * 定義一個抽象類
 */
public abstract class Action {
    public static final int EAT = 1;
    public static final int WORK = 3;
    public static final int SLEEP = 5;


    public abstract void eat();
    public abstract void work();
    public abstract void sleep();

    public void commond(int flag) {
        switch (flag) {
            case EAT :
                this.eat();
                break;
            case WORK :
                this.work();
                break;
            case SLEEP :
                this.sleep();
                break;
            default:
                break;
        }
    }
}

 

package com.demo;

/**
 * Created by Ranjx on 2018/7/22.
 * 機器人繼承抽象類，強制覆寫抽象方法
 */
public class Reboot extends Action{
    @Override
    public void eat() {
        System.out.println("機器人充電");
    }

    @Override
    public void work() {
        System.out.println("機器人工作");
    }

    @Override
    public void sleep() {

    }
}

 

package com.demo;

/**
 * Created by Ranjx on 2018/7/22.
 * 人繼承抽象類，強制覆寫抽象方法
 */
public class Human extends Action {
    @Override
    public void eat() {
        System.out.println("人喫飯");
    }

    @Override
    public void work() {
        System.out.println("人工作");
    }

    @Override
    public void sleep() {
        System.out.println("人睡覺");
    }
}

package com.demo;

/**
 * Created by Ranjx on 2018/7/22.
 * 豬繼承抽象類，強制覆寫抽象方法
 */
public class Pic extends Action {
    @Override
    public void eat() {
        System.out.println("豬喫飯");
    }

    @Override
    public void work() {

    }

    @Override
    public void sleep() {
        System.out.println("豬睡覺");
    }
}

 

package com.demo;

/**
 * Created by Ranjx on 2018/7/22.
 * 測試方法
 */
public class ActionTest {

    public static void function(Action a) {
        a.commond(Action.EAT);
        a.commond(Action.WORK);
        a.commond(Action.SLEEP);
    }

    public static void main(String[] args) {
        function(new Reboot());
        function(new Human());
        function(new Pic());
    }
}