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

volatile修饰符的更多相关文章

  1. Java 的 volatile 修饰符

    volatile 修饰符,用于多线程同步 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 ...

  2. Java中volatile修饰符，不稳定标记的用法笔记

    今天学java特性时,发现了volatile修饰符,这个修饰符修饰的变量告诉java编译器忽略优化机制,这样的优势是: java优化后,寄存器会缓存内存里的变量,另一个线程修改这个变量的内存时,不会同 ...

  3. java中Volatile修饰符的含义

    在java语言中:为了获得最佳速度,同意线程保存共享成员变量的私有拷贝.并且仅仅当线程进入或者离开同步代码块时才与共享成员变量的原始值进行对照. volatilekeyword的作用就是提示vm:对于 ...

  4. 关于STM32库中 __IO 修饰符（volatile修饰符,反复无常的意思）

    STM32例子代码中会有像这样的代码 static __IO uint32_t TimingDelay;  这里边的__IO修饰符不好理解,单从字面可以看出是为IO相关,查其标准库可以得知这个__IO ...

  5. STM32库中 __IO 修饰符（volatile修饰符）

    STM32例子代码中会有像这样的代码 static __IO uint32_t TimingDelay; 这里边的__IO修饰符不好理解,单从字面可以看出是为IO相关,查其标准库可以得知这个__IO原 ...

  6. volatile 修饰符的有过什么实践？

    一种实践是用 volatile 修饰 long 和 double 变量,使其能按原子类型来读写. double 和 long 都是 64 位宽,因此对这两种类型的读是分为两部分的,第一次 读取第一个  ...

  7. 三个线程，ABC 10次（volatile+synchronized（2 synchronized可以保证内存可见性，所以去掉status 的volatile修饰符）

    package ThreadABC; public class MyThread extends Thread { public static int status = 0; @Override pu ...

  8. 转： 【Java并发编程】之五：volatile变量修饰符—意料之外的问题（含代码）

    转载请注明出处:     volatile用处说明     在JDK1.2之前,Java的内存模型实现总是从主存(即共享内存)读取变量,是不需要进行特别的注意的.而随着JVM的成熟和优化,现在在多线程 ...

  9. 【Java并发编程】：volatile变量修饰符

    volatile用处说明     在JDK1.2之前,java的内存模型实现总是从主存(即共享内存)读取变量,是不需要进行特别的注意的.而随着JVM的成熟和优化,现在在多线程环境下volatile关键 ...

随机推荐

  1. css设置table表格tr分离

    table { border-collapse:separate; border-spacing:10px 50px; }

  2. Go语言开发

    Go语言圣经(中文版)     Go编程语言规范 搭建Go开发及调试环境(LiteIDE + GoClipse) -- Windows篇           Go开发工具 Go命令行操作命令详细介绍 ...

  3. PHP变量

    变量的声明 PHP变量声明必须是$(美元符号)+变量名进行命名,同时在=(赋值操作符)后进行赋值 声明后的变量不是仅可以在一个<?php 这里是php代码 ?>使用,它还可以在当前页面所有 ...

  4. jdk安装

    x86 和 x64的安装判别 [root@CentOS ~]# uname -aLinux CentOS 2.6.32-358.el6.i686 #1 SMP Thu Feb 21 21:50:49 ...

  5. EF 添加方式比较

    using System; using System.Collections.Generic; using DBAccess.Models; using EntityFramework.BulkIns ...

  6. python语言中的编码问题(续)

    上文提到了python开发中非常重要的两处设置. 一个是编解码器的默认设置defaultencoding >>> import sys >>> sys.getdef ...

  7. 你必须收藏的Github技巧

    一秒钟把Github项目变成前端网站 GitHub Pages大家可能都知道,常用的做法,是建立一个gh-pages的分支,通过setting里的设置的GitHub Pages模块可以自动创建该项目的 ...

  8. AlloyRenderingEngine之Shape

    写在前面 不读文章,只对代码感兴趣可以直接跳转到这里 https://github.com/AlloyTeam/AlloyGameEngine 然后star一下,多谢支持:). 游戏或者应用中,不是所 ...

  9. ArcGIS Engine开发前基础知识（2）

    ArcGIS基本控件简介 ArcGIS Engine控件是一组可视化的开发组件,每个ArcGIS Engine控件都是一个COM组件.这些组件包括MapControl,PageLayoutContro ...

  10. （八）map，filter，flatMap算子-Java&Python版Spark

    map,filter,flatMap算子 视频教程: 1.优酷 2.YouTube 1.map map是将源JavaRDD的一个一个元素的传入call方法,并经过算法后一个一个的返回从而生成一个新的J ...