在Java中使用Thread.yield()
发布时间:2020-12-15 04:08:47 所属栏目:Java 来源:网络整理
导读:我有以下课程: package net.adjava.multithreading;public class MyResource { private int a; public int getA() { return a; } public void setA(int a) { this.a = a; }} package net.adjava.multithreading;public class Thread1 extends Thread { MyRe
我有以下课程:
package net.adjava.multithreading; public class MyResource { private int a; public int getA() { return a; } public void setA(int a) { this.a = a; } } package net.adjava.multithreading; public class Thread1 extends Thread { MyResource m; public Thread1(MyResource m) { super(); this.m = m; } @Override public void run() { System.out.println("Current Thread name1 :" + Thread.currentThread().getName()); for (int i = 0; i < 10000; i++) { m.setA(i); System.out.println("Set method sets the value of a as: " + i); System.out.println("Current Thread name1 :" + Thread.currentThread().getName()); Thread.yield(); } } } package net.adjava.multithreading; public class Thread2 extends Thread { MyResource m; public Thread2(MyResource m) { super(); this.m = m; } @Override public void run() { System.out.println("Current Thread name2 :" + Thread.currentThread().getName()); for (int i = 0; i < 100; i++) { System.out.println(" value of a as per getter method is :" + m.getA()); System.out.println("Current Thread name2 :" + Thread.currentThread().getName()); } System.out.println("waiting for thread to end"); } } package net.adjava.multithreading; public class ThreadExecutionPoint { public static void main(String args[]) { System.out.println("Current Thread name main :" + Thread.currentThread().getName()); MyResource m = new MyResource(); Thread1 th1 = new Thread1(m); Thread2 th2 = new Thread2(m); th1.start(); th2.start(); } } 我试图用上面的类来理解yield()的目的.在尝试这个例子之前我所知道的yield()就是它暂停调用它的线程.所以为了测试它我在Thread1类中使用了yield方法.所以基本上根据我的理解,thread1应该执行for循环一次然后应该暂停并等待其他线程完成.但输出显示不同的结果.输出显示第一个thread1被执行然后执行thread2.有人可以纠正我错过的东西吗?或者我对yield()的理解有问题. 解决方法
文档说明这与yield方法有关:
即使可能发生这种情况,也没有任何东西可以保证您选择要处理的线程不是同一个. 由于几乎所有的协作线程都不依赖于此,因为您无法保证预期的功能. (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |