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Which of these statements about what Collections.nCopies returns is correct?

  • A.A mutable list of the requested size.
  • B.An immutable list containing distinct copies of the given object.
  • C.An array rather than a list.
  • D.An immutable list of the requested size in which every element is the same object.

Answer: D

It is a compact view rather than a real list of stored elements, which is why it costs nothing for a large size, and why it is immutable. Note that the single object is shared, so a mutable element would appear to change in every position at once.

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