线程的阻塞-join-yield-sleep

join合并线程

public class JoinThread {

    public static void main(String args[]) throws InterruptedException {
        Thread t = new Thread(new MyThread());
        t.start();
        for(int i =0;i<1000;i++){
            if(i == 10){
                t.join();  // main方法阻塞  必须等待 t执行完毕， join合并线程
            }
            System.err.println("main...."+i);
        }
    }

}

class MyThread implements Runnable{


    @Override
    public void run() {
        for(int i =0;i<50;i++){
            System.err.println("myThread...."+i);
        }
    }
}

yield Thread.yield() 阻塞当前线程

public class YieldThread {

    public static void main(String args[]) throws InterruptedException {
        Thread t = new Thread(new MyThread1());
        t.start();
        for(int i =0;i<1000;i++){
            if(i%20 == 0 ){
               Thread.yield();  // main方法 阻塞自己，主要取决于cpu
            }
            System.err.println("main...."+i);
        }
    }

}
class MyThread1 implements Runnable{
    @Override
    public void run() {
        for(int i =0;i<50;i++){
            System.err.println("yield...."+i);
        }
    }
}

sleep 休眠，不会释放锁