JAVA Thread.yield的用法

package com.puple.atto.datastructure;

public class ThreadTest extends Thread{
    @Override
    public void run()
    {
        long beginTime=System.currentTimeMillis();
        System.out.println("线程开始执行时间："+beginTime);
        int count=0;
        for (int i=0;i<50000000;i++)
        {
            Thread.yield();    //调用yield()方法，暂时不用
            count=count+(i+1);
        }
        long endTime=System.currentTimeMillis();
        System.out.println("线程结束执行时间："+endTime);
        System.out.println("本次执行用时："+(endTime-beginTime)+"毫秒！");
    }

    public static void main(String[] args) {
        ThreadTest thread=new ThreadTest();    //创建MyThread12线程实例
        thread.start();    //启动线程
    }
}