线程通信-采用标志位

package com.Java;

public class Testflag {
    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) {
                tv.play("快乐大本营");
            }else {
                tv.play("B站");
            }
        }
    }
}

//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->TV
class TV {
    String voice;
    boolean flag = false;

    public synchronized void play(String voice) {
        if (flag) {
            try {
                //如果还有节目则等待观众看完
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        //没有节目则表演
        System.out.println("演员表演了"+voice);
        this.voice = voice;
        this.flag = !flag;
        //通知观众可以观看了
        this.notifyAll();
    }

    public synchronized void watch() {
        if (!flag) {
            //如果没有节目了 就等待演员表演节目
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        //如果有节目 则直接观看
        System.out.println("观众观看了" + voice);
        this.flag = !flag;
        //看完通知演员开始演节目了
        this.notifyAll();
    }
}