Java Set MCQs with answers Page - 4

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 will happen if you try to add null to a TreeSet?

  • (A) It will be added
  • (B) It will be ignored
  • (C) It will throw NullPointerException
  • (D) It will be replaced

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Q. Which of the following Set implementations is backed by a hash table?

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

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Q. Which method is used to remove all elements from a Set?

  • (A) removeAll()
  • (B) clear()
  • (C) deleteAll()
  • (D) reset()

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Q. Which Set implementation should be used when elements are enums?

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

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Q. What will happen when you use the addAll() method on a Set?

  • (A) Duplicates are added
  • (B) Only new elements are added
  • (C) Existing elements are replaced
  • (D) All elements are cleared before adding

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Q. Which collection interface does NOT allow duplicate elements?

  • (A) List
  • (B) Map
  • (C) Set
  • (D) Queue

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Q. What is the main difference between Set and List?

  • (A) List is unordered, Set is ordered
  • (B) Set allows duplicates, List does not
  • (C) List maintains order and allows duplicates, Set does not
  • (D) There is no difference

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Q. Which class implements a Set that uses a red-black tree for ordering?

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

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Q. What happens when you use `equals()` to compare two Sets with same elements?

  • (A) Returns false if order differs
  • (B) Returns true only if order is same
  • (C) Returns true if contents are same
  • (D) Throws ClassCastException

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Q. Which of the following allows only unique values and provides fast lookup?

  • (A) List
  • (B) Map
  • (C) HashSet
  • (D) ArrayList

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