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IllegalMonitorStateException doubt

 
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GIven the following code :


Can someone please tell me why does the above code result in IllegalMonitorStateException at runtime?

And please explain a little about synchronized code blocks. I just can't seem to get hang of them.

Thanks
 
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You synchronize on whatever.class, then try to get the lock on "this". You can only call wait, notify and notifyAll on objects you synchronize on.
 
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