The Java language does not provide a simple way to acquire a variable-sized set of locks; in the infrequent cases where this must be done, it is done by recursion.

• Java语言不提供用于获取可变大小的锁集合的简便方法。必须这么做的情况很少见,一旦碰到这种情况,可以用递归方法来实现。