javaconcurrencywait
Certification practice exam on timed wait
Why is the second answer correct? What exception was thrown and why?
P.S. Thanks for the answer!
Now I see that t1.wait() shall be inside synchronized(t1) - on t1, the same instance used to call wait(). Also this answer was helpful.
This is a free test taken from here
Solution
Since this code calls t1.wait without holding the lock on t1 object - the IllegalMonitorStateException will be thrown - as is documented in Object::wait(time) method. This is a RuntimeException so it does not have to be specified in method signature. synchronized on Bees::go method will make sure that thread invoking this method will hold lock on Bees object - not t1 object.
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