Java Streams MCQs with answers Page - 3

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Q. Which method is used to convert a stream into an array?

  • (A) toArray()
  • (B) toList()
  • (C) toArrayList()
  • (D) collectArray()

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Q. What is the result of calling `stream().distinct()`?

  • (A) All elements are sorted
  • (B) All duplicate elements are removed
  • (C) The stream is reversed
  • (D) All null values are removed

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Q. Which of the following is a terminal operation?

  • (A) filter()
  • (B) map()
  • (C) collect()
  • (D) limit()

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Q. Which method finds the minimum element of a Stream using a Comparator?

  • (A) least()
  • (B) smallest()
  • (C) min()
  • (D) findMin()

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Q. Which of the following operations does NOT change the number of elements in a Stream?

  • (A) filter()
  • (B) flatMap()
  • (C) map()
  • (D) forEach()

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Q. Which of these is an intermediate operation?

  • (A) collect()
  • (B) reduce()
  • (C) map()
  • (D) count()

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Q. What does `Collectors.joining()` do?

  • (A) Combines elements into a list
  • (B) Combines elements into a string
  • (C) Sorts elements
  • (D) Finds duplicates

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Q. Which of these returns true if all elements match a given condition?

  • (A) anyMatch()
  • (B) noneMatch()
  • (C) allMatch()
  • (D) filterMatch()

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Q. What does `peek()` return?

  • (A) A list of elements
  • (B) The same stream after performing a side-effect
  • (C) A copy of the stream
  • (D) Null

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Q. Can streams be reused once consumed?

  • (A) Yes, always
  • (B) Yes, if reset() is called
  • (C) No
  • (D) Only if the stream is infinite

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