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Doubt on Thread- wait()

 
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Hi,

I was running the code below and thought of commenting the line calling notify(). So that I may see if I get IIlegalMonitorStateException. But the code ran successfully without throwing error. Please explain me why? Isn't it necessary for the thread to send notify() to the waiting thread? I think main() thread should throw the exception after not receiving notification from ThreadB b? Please correct me ...if my understanding is wrong..?

 
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it's not necessary to call notify

It's simply to notify waiting thread to wake up.
if not implemeted,the waiting thread would not wake up
that's it..
 
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