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  • 1.9yield方法

    yield()方法的作用放弃当前的cpu资源,将他让给其他的任务去占用cpu的执行时间,但放弃的时间不确定,有可能刚放弃,马上又获得cpu时间片

    测试

     1 package com.cky.thread;
     2 
     3 /**
     4  * Created by edison on 2017/12/3.
     5  */
     6 public class MyThread3 extends Thread{
     7     @Override
     8     public void run() {
     9         super.run();
    10         long begin = System.currentTimeMillis();
    11         int count =0;
    12         for (int i = 0; i < 5000000; i++) {
    13             //Thread.yield();
    14             count=count+(i+1);
    15         }
    16         long end = System.currentTimeMillis();
    17         System.out.println("用时" +(end-begin)+"毫秒");
    18     }
    19 }
     1 package com.cky.test;
     2 
     3 import com.cky.thread.MyThread3;
     4 
     5 /**
     6  * Created by edison on 2017/12/3.
     7  */
     8 public class Test3 {
     9     public static void main(String[] args) {
    10         MyThread3 th = new MyThread3();
    11         th.start();
    12     }
    13 }
    package com.cky.thread;
    
    /**
     * Created by edison on 2017/12/3.
     */
    public class MyThread3 extends Thread{
        @Override
        public void run() {
            super.run();
            long begin = System.currentTimeMillis();
            int count =0;
            for (int i = 0; i < 5000000; i++) {
                Thread.yield();
                count=count+(i+1);
            }
            long end = System.currentTimeMillis();
            System.out.println("用时" +(end-begin)+"毫秒");
        }
    }

    上述两种情况运行结果

    有注释:48毫秒

    无注释:11100毫秒

    结果说明了他放弃当前的cpu资源。

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  • 原文地址:https://www.cnblogs.com/edison20161121/p/7954792.html
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