Why does every object in Java implicitly extend java.lang.Object class?

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I would say that the reason is to have a common API for all objects in java to supports basic functionality like

  • synchronization – wait, notify, notifyAll
  • garbage collection – finalize
  • collection support – hashCode, equals
  • object cloning – clone

And every object

  • has a class it belongs to – getClass
  • can represent itself as a string, because we are
    humans and can read strings – toString

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