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Which one of these lists contains only methods that Thread inherits from Object?

  • A.wait, notify, notifyAll
  • B.wait, sleep, notify
  • C.notify, join, notifyAll
  • D.wait, interrupt, notifyAll

Answer: A

wait, notify and notifyAll belong to Object, so every object has them, not just threads. sleep, join and interrupt are declared on Thread itself. Beginners often expect the whole set to live on Thread, which is why they are so often confused.

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