yield的作用就是主动释放CPU的执行权,会将线程从运行状态转为就绪状态,让后调度执行其他线程
使用方法如下:

public class YieldTest {
    public static void main(String[] args) {
        ThreadTest t1 = new ThreadTest("张三");
        ThreadTest t2 = new ThreadTest("李四");
        t1.start();
        t2.start();
    }
}

class ThreadTest extends Thread{
    private Object object = new Object();


    private String name;

    public ThreadTest(String name) {
        this.name = name;
    }


    @Override
    public void run() {
        for (int i = 0; i < 50; i++) {
            if (i == 30){
                System.out.println(name+ "释放了Cpu执行权");
                yield();
            }
            System.out.println(name+"的执行次数:"+i);
        }
    }
}