yield方法的作用是房企当前的CPU资源,将他让给其他的任务去占用CPU执行时间,但房企的时间不确定,有可能刚刚放弃,马上又获得CPU时间片。
package yield; /**
* Created by liping.sang on 2017/1/13 0013.
*/
public class Mythread extends Thread{
public void run(){
long beginTime = System.currentTimeMillis();
int count = 0 ;
for(int i=0;i<500000;i++){
count = count+(i+1);
}
long endTime = System.currentTimeMillis();
System.out.println("用时:"+(endTime-beginTime)+"毫秒!");
}
}
package yield; /**
* Created by liping.sang on 2017/1/13 0013.
*/
public class Run {
public static void main(String [] args){
Mythread thread = new Mythread();
thread.start();
}
}
用时:16毫秒!
如果加入Thread.yield()则结果变为:
用时:130毫秒!