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Which of these statements about why Thread.stop() is deprecated is correct?

  • A.stop() is unsafe because it may leave the thread's monitors permanently locked.
  • B.stop() is unsafe because it cannot interrupt a thread that is blocked waiting to acquire a monitor lock.
  • C.stop() is unsafe only when called on a daemon thread.
  • D.stop() is unsafe because it unlocks every monitor the thread held, exposing half-updated objects.

Answer: D

The javadoc explains that stopping a thread unlocks all of the monitors it had locked, so any object left in an inconsistent state by the half-finished work becomes visible to other threads, giving arbitrary behaviour. The damage is to shared data, not to the locks themselves.

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