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Which one of the following statements about the difference between List.remove(int) and List.remove(Object) is true?

  • A.remove(int) deletes by position while remove(Object) deletes the first equal element.
  • B.Both delete by position; the Object form converts its argument to an index.
  • C.Both delete the first equal element; the int form is simply a convenience overload.
  • D.remove(int) deletes by position and remove(Object) deletes every equal element.

Answer: A

They are overloads with quite different meanings, and on a List<Integer> the choice depends on the static type of the argument: remove(1) deletes index 1, while remove(Integer.valueOf(1)) deletes the element equal to 1. This is the classic reason to reach for an explicit cast or valueOf.

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