生产者消费者问题2信号灯法

package com.test.Thread;
//解决生产者消费者问题方法2：信号灯法

public class TestPC2 {
    public static void main(String[] args) {
        TV tv =new TV();
        new Player(tv).start();
        new Watcher(tv).start();
    }
}
//生产者：演员
class Player extends Thread{
    TV tv;

    public Player(TV tv) {
        this.tv = tv;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            if(i%2==0){
                this.tv.play("快乐大本营");
            }else{
                this.tv.play("斗鱼");
            }

        }
    }
}
//消费者：观众
class Watcher extends Thread{
    TV tv;

    public Watcher(TV tv) {
        this.tv = tv;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            tv.watch();

        }
    }
}
//产品：电视节目
class TV{
    //演员表演，观众等待 T
    //观众观看，演员等待 F
    String voice;
    boolean flag =true;
    public synchronized  void play(String voice){
        //观众观看，演员等待
        if (!flag){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        //若观众没看，演员表演
        System.out.println("演员表演了"+voice);
        //通知观众看
        this.notifyAll();
        this.voice=voice;
        this.flag=!this.flag;

    }
    //观看方法
    public synchronized  void watch(){
        //演员表演观众等待
        if(flag){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("观看了："+voice);
        //通知演员表演
        this.notifyAll();
        this.flag=!this.flag;


    }
}