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Semaphore is for signaling and mutex is for lock.
- Digi Digi January 22, 2013When you want a lock on a object and you want to keep other threads waiting, you can use synchronized keyword. The object under synchronized block will be locked and no other thread can use it.
While wait(), notify() and notifyAll() are signaling system, means when two threads want to communicate using an object you can use these methods. these are works as semaphore do.