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Consider the monitor a thread must own to call wait(). Which statement is correct?

  • A.wait() may be called from any thread, but only notify() requires owning the monitor.
  • B.wait() must be called by a thread owning the object's monitor, or IllegalMonitorStateException is thrown.
  • C.wait() may be called from any thread.
  • D.wait() must be called from outside a synchronized block, or IllegalMonitorStateException is thrown.

Answer: B

All of wait, notify and notifyAll should only be called by a thread that owns the object's monitor, and calling one without that ownership throws IllegalMonitorStateException. In practice that means the call sits inside a synchronized block or method on the same object. The requirement applies equally to notify.

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