zoukankan      html  css  js  c++  java
  • volatile修饰符

    Volatile 修饰的成员变量在每次被线程访问时,都强制从共享内存中重新读取该成员变量的值。而且,当成员变量发生变化时,会强制线程将变化值回写到共享内存。这样在任何时刻,两个不同的线程总是看到某个成员变量的同一个值。

    一个volatile对象引用可能是null。

    (1)Java程序代码

    package niukewang;
    
    public class volatile_Test {
    
        public static void main(String args[]) {
            MyRunnable r = new MyRunnable();
            Thread t1 = new Thread(r);
    t1.start();
    try { Thread.sleep(2); r.stopThread(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } class MyRunnable implements Runnable { private volatile boolean active; public void run() { active = true; while (active) // 第一行 { // 代码 System.out.println("Print the line"); } } public void stopThread() { System.out.println("Set to false"); active = false; // 第二行 } }

    只有当调用stopThread时候,设置了ative为false的时候,然后线程获取了false的值,会停止第一行中内容的输出。

    (2)输出结果。

    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Print the line
    Set to false
    Print the line
  • 相关阅读:
    单相、二相、三相区别
    Live for Speed 车模、赛道模型导出
    Lenovo/IBM Thinkpad X41 Tablet
    科普题外话 赛车性能的关键指标: 马力和扭力
    MAME™ Official Developer Documentation!
    Visual Studio 2005 & SQL Server 2005 are COMING!
    星际争霸(Star Craft)的Sprites导出
    推荐一本关于操作系统实践的好书
    科普题外话:Experimental Advanced Superconducting Tokamak - 人造太阳
    The Space Elevator -通往地球同步轨道的天梯
  • 原文地址:https://www.cnblogs.com/twodog/p/12141439.html
Copyright © 2011-2022 走看看