• 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:
    testing
    mysql的collation
    使用elk+redis搭建nginx日志分析平台
    安装logstash,elasticsearch,kibana三件套
    技术晨读_2014_12_22
    laravel中的错误与日志
    maven仓库--私服(Nexus的配置使用)
    Youtube的论文《Deep Neural Networks for YouTube Recommendations》
    2018中国区块链应用生态发展报告
    阿里云云盾抗下全球最大DDoS攻击(5亿次请求,95万QPS HTTPS CC攻击) ,阿里百万级QPS资源调度系统,一般的服务器qps多少? QPS/TPS/并发量/系统吞吐量
  • 原文地址:https://www.cnblogs.com/twodog/p/12141438.html
Copyright © 2020-2023  润新知