Java多线程——生产者消费者模型：信号灯法

//生产者消费者模型：信号灯法，标志位解决
public class TestThread07 {
	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("抖音：记录美好生活");
			}
		}
	}
}

//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();
		}
	}
}

class TV{
	//演员表演，观众等待
	//观众观看，演员等待
	String voice;//表演的节目
	boolean flag = true;

	//表演
	public  synchronized void play(String voice){
		if(!this.flag){
			try {
				this.wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		System.out.println("演员表演了："+voice);
		this.notifyAll();//通知观众观看
		this.voice = voice;
		this.flag = !this.flag;
	}

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