一道经典的面向对象题目的JAVA实现

在教学过程中，面向对象教学结束后，非常经典的一个总结实现就是来自IBM的面试题，具体内容为：

猫叫了，所有老鼠都跑了，主人醒了。要求以观察者模式实现。

public interface Obeserver {
    public void action();
}

public interface Subject {
    public void add(Obeserver ob);
}

public class Master implements Obeserver {
    
    public Master(Subject sub) {
        sub.add(this);
    }

    @Override
    public void action() {
        System.out.println("主人醒了。");
        
    }

}

public class Mouse implements Obeserver {
    
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    
    public Mouse(Subject sub,String name) {
        this.setName(name);
        sub.add(this);
    }

    @Override
    public void action() {
        System.out.println("老鼠" + this.getName() + "跑了。");
        
    }

}

import java.util.ArrayList;
import java.util.List;


public class Cat implements Subject {
    
    private List<Obeserver> list = new ArrayList<Obeserver>();

    @Override
    public void add(Obeserver ob) {
        list.add(ob);
        
    }
    
    public void cry() {
        System.out.println("猫叫了。");
        for(Obeserver o : list) {
            o.action();
        }
    }

}

public class Test {
    public static void main(String[] args) {
        Cat sub = new Cat();
        Master oa = new Master(sub);
        Mouse ob = new Mouse(sub, "甲");
        Mouse oc = new Mouse(sub, "乙");
        sub.cry();
    }
}