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Which of these statements about Thread.sleep and the monitors a sleeping thread holds is correct?

  • A.sleep() pauses the thread whose Thread object it is invoked on, retaining every monitor.
  • B.sleep() pauses the calling thread and releases the monitors it holds.
  • C.sleep() pauses the calling thread and releases only the monitor of the object it is called on.
  • D.sleep() is static and pauses the thread that calls it, retaining every monitor it holds.

Answer: D

Thread.sleep is static, so it always affects the thread that calls it; writing t.sleep(100) still puts the current thread to sleep, not t. The javadoc states the thread does not lose ownership of any monitors, so a lock held across a sleep stays held and other threads waiting on it make no progress.

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