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Which one of the following statements about what List.contains uses to decide membership is true?

  • A.The equals method of the elements, not reference identity.
  • B.Reference identity, so an equal but distinct object is not found.
  • C.The hashCode of the elements, exactly as a HashSet does.
  • D.The compareTo method, so the elements must be Comparable.

Answer: A

contains and indexOf both search with equals, so a value-equal object is found even though it is a different instance. That also means a class with no equals override is searchable only by identity, since the inherited version compares references.

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