• 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:
    滚动页面时DIV到达顶部时固定在顶部
    【Java学习笔记】拾遗
    【Java学习笔记】文件信息
    【Java学习笔记】使用BufferedReader类(流的读写)
    【Java学习笔记】可变参数
    【Java学习笔记】控制台读写
    【Java学习笔记】关于默认值
    【Java学习笔记】FileChannel的学习
    【JAVA学习笔记】静态导入
    【Java学习笔记】Java中关于tostring方法的误操作
  • 原文地址:https://www.cnblogs.com/twodog/p/12141437.html
Copyright © 2020-2023  润新知