关于锁的可重入性的一个小问题，诸位大神给讲一下

[若鱼1919]

为什么“都会在处理前获得Widget”的锁？

[十年彩虹]

[龙四]

那个“Widget的锁”其实指的是LoggingWidget对象上的锁

[龙四]

http://ifeve.com/locks/#lockReentrance http://ifeve.com/reentrance-lockout/ http://ifeve.com/read-write-locks/#reentrance

[若鱼1919]

英文的原话是： Because the doSomething methods in Widget and LoggingWidget are both synchronized, each tries to acquire the lock on the Widget before proceeding. 我咋感觉应该是lock on the LoggingWidget 而不是Widget呢？

[龙四]

引用 4 楼 goldenfish1919 的回复:

英文的原话是： Because the doSomething methods in Widget and LoggingWidget are both synchronized, each tries to acquire the lock on the Widget before proceeding. 我咋感觉应该是lock on the LoggingW……

锁对象确实是LoggingWidget，也许这里原文是个笔误，也许是用父类引用泛指子类对象这样来描述的 《Java Concurrency in Practise》的这一处确实给不少人带来了疑惑。

[若鱼1919]

引用 3 楼 ticmy 的回复:

http://ifeve.com/locks/#lockReentrance http://ifeve.com/reentrance-lockout/ http://ifeve.com/read-write-locks/#reentrance

龙少爷威武！