What are condition variables? how do condition variables and monitors work?

What are condition variables? how do condition variables and monitors work? Isn't condition variables the same as semaphore? After reading their implementaion over and over again..I still don't know how condition variables and monitors work together to provide good synchroniztion.
Thanks

I can tell you they have nothing to do with Serialization.
Are you refering to the Condition class in Java 5+
Usually you would use either a Condition or use synchronization, so you shouldn't need to use them together.

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