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Threads

Q1: Which statement is true?

A The notifyAll() method must be called from a synchronized context.

B To call wait(), an object must own the lock on the thread.

C The notify() method is defined in class java.lang.Thread.

D The notify() method causes a thread to immediately release its locks.

ANS:A - The notifyAll() method must be called from a synchronized context.

Option A is correct because the notifyAll() method (along with wait() and notify()) must always be called from within a synchronized context. Option B is incorrect because to call wait(), the thread must own the lock on the object that wait() is being invoked on, not the other way around. Option C is wrong because notify() is defined in java.lang.Object. Option D is wrong because notify() will not cause a thread to release its locks. The thread can only release its locks by exiting the synchronized code.



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