static synchronized methods?

原创于 2010-11-16 21:41:00 发布 · 134 阅读

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本文详细介绍了Java中使用synchronized关键字实现同步的方法，并展示了如何通过不同的锁对象实现细粒度的锁控制，从而避免不必要的资源竞争。

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Keep in mind that using synchronized on methods is really just shorthand (assume class is SomeClass):

synchronized static void foo() {
    ...
}

is the same as

static void foo() {
    synchronized(SomeClass.class) {
        ...
    }
}

and

synchronized void foo() {
    ...
}

is the same as

void foo() {
    synchronized(this) {
        ...
    }
}

You can use any object as the lock. If you want to lock subsets of static methods, you can

class SomeClass {
    private static final Object LOCK_1 = new Object();
    private static final Object LOCK_2 = new Object();
    static void foo() {
        synchronized(LOCK_1) {...}
    }
    static void fee() {
        synchronized(LOCK_1) {...}
    }
    static void fie() {
        synchronized(LOCK_2) {...}
    }
    static void fo() {
        synchronized(LOCK_2) {...}
    }
}