信号灯模式用flag控制线程

public class TestTV {
public static void main(String [] args){
TV tv=new TV();
new Thread(new jiemu(tv)).start();
new Thread(new guanzhong(tv)).start();

}
}
class jiemu implements Runnable{
TV tv;

public jiemu(TV tv) {<br />        this.tv = tv;<br />    }
@Override<br />    public void run() {<br />        for(int i=0;i<20;i++){<br />            if(i%2==0){<br />                tv.biaoyan("抖音记录美好生活");<br />            }else{<br />                tv.biaoyan("快乐大本营");<br />            }<br />        }<br />    }<br />}

class guanzhong implements Runnable{
TV tv;

public guanzhong(TV tv) {

        this.tv = tv;

}

@Override<br />    public void run() {<br />        for(int i=0;i<20;i++){<br />        tv.shoukan();<br />        }<br />    }<br />}

class TV{
boolean flag=true; //是否在表演
String dsjm = “”;

public synchronized void biaoyan(String jm){<br />        if(flag){<br />            try {<br />                wait();<br />            } catch (InterruptedException e) {<br />                e.printStackTrace();<br />            }

    }<br />        System._out_.println("电视在播放"+jm);<br />        dsjm=jm;<br />        this.notifyAll();<br />        this.flag=!this.flag;<br />    }

public synchronized void shoukan(){<br />        if (!flag){<br />            try {<br />                this.wait();<br />            } catch (InterruptedException e) {<br />                e.printStackTrace();<br />            }<br />        }<br />        System._out_.println("观众在收看"+dsjm);<br />        this.notifyAll();<br />        this.flag=!this.flag;<br />    }

}