Java Set MCQs with answers Page - 5

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. Which method is used to find if two sets have any common elements?

  • (A) retainAll()
  • (B) removeAll()
  • (C) containsAll()
  • (D) intersect()

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Q. Which data structure does TreeSet use internally?

  • (A) Hashtable
  • (B) LinkedList
  • (C) Array
  • (D) Red-Black Tree

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Q. Which one of the following Set types is backed by a hash table and allows one null element?

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

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Q. What is the time complexity of contains() in HashSet in average case?

  • (A) O(1)
  • (B) O(n)
  • (C) O(log n)
  • (D) O(n log n)

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Q. Which of the following will throw NullPointerException?

  • (A) new HashSet<>().add(null)
  • (B) new TreeSet<>().add(null)
  • (C) new LinkedHashSet<>().add(null)
  • (D) new ArrayList<>().add(null)

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Q. Which of these interfaces must be implemented to sort custom objects in TreeSet?

  • (A) Serializable
  • (B) Comparator or Comparable
  • (C) Cloneable
  • (D) Iterable

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Q. Which collection type would you use to remove duplicates from a list?

  • (A) ArrayList
  • (B) LinkedList
  • (C) HashSet
  • (D) Vector

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Q. Which of the following statements is FALSE about Set?

  • (A) Set does not allow duplicate elements
  • (B) Set allows access by index
  • (C) Set is unordered by default
  • (D) Set can store null depending on implementation

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Q. Which implementation would you choose for a Set where order matters and duplicates are not allowed?

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

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Q. Which of these Set types maintains elements in natural sorted order?

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

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