Java Concurrency Interview: Implement Producer Consumer pattern using wait-notify

Implementing Producer Consumer using BlockingQueue, Locks/Conditions and Wait-Notify.

Important: The last part about using wait-notify is incorrect. My mistake, sorry about that.

The object used to wait/notify should be the same object used by threads to synchronize (to avoid IllegalMonitorStateException). So correct code should be similar to:

synchronize(sharedQ){
sharedQ.wait();
}
synchronize(sharedQ){
sharedQ.notifyAll();
}

That was a basic mistake which I should have caught. I feel bad about misleading the initial viewers. Sorry.
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