静态变量的线程安全 | 静态变量的线程安全

本文介绍了静态变量的线程安全的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

class ABC implements Runnable {
    private static int a;
    private static int b;
    public void run() {
    }
}

我有一个上面的Java类.我有此类的多个线程.在run()方法中，变量a& b分别递增几次.每次增加时，我都会将这些变量放入哈希表中.

I have a Java class as above. I have multiple threads of this class. In the run() method, the variables a & b are incremented each for several times. On each increment, I am putting these variables in a Hashtable.

因此，每个线程将增加两个变量并将它们放入Hashtable中.如何使这些操作线程安全?

Hence, each thread will increment both variables and putting them in Hashtable. How can I make these operations thread safe?

推荐答案

我会使用 AtomicInteger ，它被设计为线程安全的，非常容易使用，并为应用程序带来了最小的同步开销:

I would use AtomicInteger, which is designed to be thread-safe and is dead easy to use and imparts the absolute minimal of synchronization overhead to the application:

class ABC implements Runnable {
    private static AtomicInteger a;
    private static AtomicInteger b;
    public void run() {
        // effectively a++, but no need for explicit synchronization!
        a.incrementAndGet();
    }
}

// In some other thread:

int i = ABC.a.intValue(); // thread-safe without explicit synchronization

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