Question

I can use object.wait ,object.notify and synchronized blocks to solve the producer consumer type of problems. At the same time I can use locks and conditions from java.util.concurrent package. I am sure I am not able to understand why we need conditions when we can use object.wait and notify to make threads waiting on some condition like queue is empty or full. Is there any other benefit we are getting if we use java.util.concurrent.locks.Condition ?

Answer 1

This article provides a good explanation:

Just as Lock is a generalization for
synchronization, the Lock framework
includes a generalization of wait and
notify called Condition. A Lock object
acts as a factory object for condition
variables bound to that lock, and
unlike with the standard wait and
notify methods, there can be more than
one condition variable associated with
a given Lock.