volatile修饰符

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2024-08-30 13:16:12 226人阅读

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
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Print the line
Print the line
Print the line
Print the line
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Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
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Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
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Print the line
Print the line
Print the line
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Print the line
Print the line
Print the line
Print the line
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Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
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Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
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Print the line
Print the line
Print the line
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Print the line
Print the line
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Print the line
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Print the line
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Print the line
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Print the line
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Print the line
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Print the line
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Print the line
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Print the line
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Print the line
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Print the line
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Print the line
Print the line
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Print the line
Print the line
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Print the line
Print the line
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Print the line
Print the line
Print the line
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Print the line
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Print the line
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Print the line
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Print the line
Print the line
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Print the line
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Print the line
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Print the line
Print the line
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Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
Print the line
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

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volatile修饰符

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