Java之多线程学习笔记二十三 —— 信号灯法

Java之多线程学习笔记二十三 —— 信号灯法

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参考教程B站狂神https://www.bilibili.com/video/BV1V4411p7EF

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信号灯法，通过标志位解决

package pers.ylw.thread;

//测试生产者消费者问题2：信号灯法，标志位解决
public class TestPC2 {
     
    public static void main(String[] args) {
     
        TV tv = new TV();
        new Player(tv).start();
        new Watcher(tv).start();
    }
}

//生产者-->明星
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("广告");
            }
        }
    }
}

//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-->节目
class TV{
     
    //演员拍片，观众等待 true
    //观众观看，演员等待 false
    String voice; //拍的片子
    boolean flag = true;

    //明星拍片
    public synchronized void play(String voice){
     
        if (!flag){
     
            try {
     
                this.wait();
            } catch (InterruptedException e) {
     
                e.printStackTrace();
            }
        }
        System.out.println("明星拍片了："+voice);
        //通知观众观看
        this.notifyAll(); //通知唤醒
        this.voice = voice;
        this.flag = !this.flag;
    }

    //观看
    public synchronized void watch(){
     
        if (flag){
     
            try {
     
                this.wait();
            } catch (InterruptedException e) {
     
                e.printStackTrace();
            }
        }
        System.out.println("观众观看了："+voice);
        //通知明星拍片
        this.notifyAll();
        this.flag = !this.flag;
    }

}