Lock objects work very much like the implicit locks used by synchronized code.

锁对象的工作原理和通过同步方法严格实现的锁一样。

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The biggest advantage of lock objects over implicit locks is their ability to back out of an attempt to acquire a lock.

锁对象比严格的锁最大的优势是他们能够从获得一个锁返回。

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The Lock classes are just ordinary classes, and the JVM does not (yet) have any knowledge of which Lock objects are owned by specific threads.

Lock 类只是普通的类，JVM 不知道具体哪个线程拥有 Lock 对象。

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