Java Set MCQs with answers Page - 3

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 convert a Set to an array?

  • (A) toArray()
  • (B) convertToArray()
  • (C) asArray()
  • (D) getArray()

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Q. Which of the following is NOT allowed in an EnumSet?

  • (A) null
  • (B) enum values
  • (C) duplicates
  • (D) empty set

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Q. Which of the following provides the fastest lookup performance?

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

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Q. Which of the following collections guarantees sorted order?

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

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Q. Which of the following is TRUE about Set?

  • (A) Set can contain duplicate elements
  • (B) Set preserves insertion order by default
  • (C) Set has a fixed size
  • (D) Set allows only unique elements

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Q. Which interface must be implemented to customize sorting in TreeSet?

  • (A) Comparator
  • (B) Comparable
  • (C) Iterable
  • (D) Listable

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Q. Which Set implementation is best suited when ordering and quick search are both important?

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

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Q. How does HashSet handle duplicate elements internally?

  • (A) Throws an exception
  • (B) Replaces the old element
  • (C) Ignores the new element
  • (D) Ignores the old element

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Q. Which method returns the number of elements in a Set?

  • (A) length()
  • (B) count()
  • (C) size()
  • (D) getSize()

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Q. Which of the following Set implementations maintains insertion order?

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

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