Java Set MCQs with answers Page - 9

You will find multiple-choice questions (MCQs) related to #Java Set here. Go through these questions to prepare effectively for your upcoming exams and interviews.

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Q. What happens if we call `remove(null)` on a HashSet that doesn't contain null?

  • (A) Throws NullPointerException
  • (B) Throws IllegalArgumentException
  • (C) Returns false
  • (D) Removes all elements

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Q. Which of the following is TRUE about EnumSet?

  • (A) It can store null elements
  • (B) It stores values in random order
  • (C) It is not type-safe
  • (D) It stores values in natural order of enum constants

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Q. What will be the output of `new TreeSet<>(Arrays.asList(5, 3, 8, 1))`?

  • (A) [5, 3, 8, 1]
  • (B) [1, 3, 5, 8]
  • (C) [8, 5, 3, 1]
  • (D) Compilation error

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Q. What happens when we add duplicate elements in LinkedHashSet?

  • (A) They are stored in order
  • (B) They are added at the end
  • (C) Only first occurrence is stored
  • (D) An exception is thrown

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Q. Which method retrieves but does not remove the first element of a NavigableSet?

  • (A) pollFirst()
  • (B) first()
  • (C) getFirst()
  • (D) peekFirst()

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Q. Which of the following allows concurrent access and sorted elements?

  • (A) HashSet
  • (B) TreeSet
  • (C) ConcurrentSkipListSet
  • (D) EnumSet

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Q. What is the default capacity of a HashSet?

  • (A) 8
  • (B) 16
  • (C) 10
  • (D) 0

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Q. How many null values can a TreeSet hold?

  • (A) One
  • (B) Unlimited
  • (C) None
  • (D) Two

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Q. What is the output of `new HashSet<>(Arrays.asList(null, null, null))`?

  • (A) [null, null, null]
  • (B) [null]
  • (C) []
  • (D) Compilation error

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Q. Which of the following is used to convert Set to List?

  • (A) List.of(set)
  • (B) Arrays.asList(set)
  • (C) new ArrayList<>(set)
  • (D) Set.toList()

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