What is real purpose of this wait-notify thread semantics?

Question

I just came across some code which uses wait-notify construct to communicate with thread defined in a class, by its other member-methods. Amusingly, after acquiring lock, all t

Answer 1

As described here,

The wait-notify pattern is used in a broad set of cases where one thread needs to tell other threads that some event has occurred. It is commonly used to implement a thread pool or producer-consumer scenario, where a particular thread or threads need to "pick up jobs" created by other threads (in this case, the "event" that has occurred is that a job has arrived for one of the threads to pick up).