Locks AutoCloseable？

问题描述

Locks AutoCloseable？也就是说，而不是：

Are Locks AutoCloseable? That is, instead of:

Lock someLock = new ReentrantLock();
someLock.lock();
try
{
    // ...
}
finally
{
    someLock.unlock();
}

我可以说：

try (Lock someLock = new ReentrantLock())
{
    someLock.lock();
    // ...
}

Java 7中的

in Java 7?

推荐答案

不，界面（也不是 class）实现 AutoCloseable 接口，该接口与新的try-with-resource语法一起使用。

No, neither the Lock interface (nor the ReentrantLock class) implement the AutoCloseable interface, which is required for use with the new try-with-resource syntax.

如果你想要让它工作，你可以写一个简单的包装器：

If you wanted to get this to work, you could write a simple wrapper:

public class LockWrapper implements AutoCloseable
{
    private final Lock _lock;
    public LockWrapper(Lock l) {
       this._lock = l;
    }

    public void lock() {
        this._lock.lock();
    }

    public void close() {
        this._lock.unlock();
    }
}

现在你可以编写如下代码：

Now you can write code like this:

try (LockWrapper someLock = new LockWrapper(new ReentrantLock()))
{
    someLock.lock();
    // ...
}

我觉得你的生活会更好但是，坚持使用旧语法。让锁定逻辑完全可见更安全。

I think you're better off sticking with the old syntax, though. It's safer to have your locking logic fully visible.

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