java - 锁可以自动关闭吗？

Question

锁可以自动关闭吗？也就是说，而不是:

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

...我可以说:

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

...在 Java 7 中？

Answer 1

我自己正在考虑这样做并做了这样的事情:

public class CloseableReentrantLock extends ReentrantLock implements AutoCloseable { 
   public CloseableReentrantLock open() { 
      this.lock();
      return this;
   }

   @Override
   public void close() {
      this.unlock();
   }
}

然后这是类的用法:

public class MyClass {
   private final CloseableReentrantLock lock = new CloseableReentrantLock();

   public void myMethod() {
      try(CloseableReentrantLock closeableLock = lock.open()) {
         // locked stuff
      }
   }
}