• 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。

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  • 原文地址:https://www.cnblogs.com/twodog/p/12141438.html
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