Had this question : "notify results in a single thread acquiring a lock whereas notifyAll results in all the threads competing for the lock and one of them acquiring it so any way only one thread is able to acquire the lock, so why do we need notfyAll at all."
The answer lies in : Even though in the first case only one thread gets the lock, the problem occurs in that there may be no other threads to notify the other threads which called wait() earlier. So, if we call notifyAll, all the threads will be waken up and will be competing for the lock. So, to compete for the lock, first step is to get woken up by getting a notification from another thread that is going to release the lock.
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