Java Set MCQs with answers Page - 2

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 does the `size()` method of a Set return?

  • (A) Total memory used
  • (B) Number of duplicate elements
  • (C) Number of elements in the Set
  • (D) Remaining capacity

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Q. Which method checks if a Set is empty?

  • (A) isAvailable()
  • (B) empty()
  • (C) isEmpty()
  • (D) hasElements()

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Q. Which Set implementation is best for frequent insertion and removal without order?

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

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Q. Which Set is specifically designed for use with enum types?

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

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Q. Can TreeSet contain null elements?

  • (A) Yes
  • (B) Only at the end
  • (C) Only one null
  • (D) No

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Q. Which of the following is true about Set in Java?

  • (A) Allows duplicates
  • (B) Maintains order of elements
  • (C) Allows multiple nulls
  • (D) Does not allow duplicate elements

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Q. Which of the following Set implementations maintains natural ordering?

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

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Q. Which interface represents a sorted set in Java?

  • (A) OrderedSet
  • (B) TreeSet
  • (C) SortedSet
  • (D) SortedList

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Q. Which method checks if an element is present in the Set?

  • (A) exists()
  • (B) contains()
  • (C) find()
  • (D) has()

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Q. Which of the following statements about TreeSet is TRUE?

  • (A) It allows duplicate elements
  • (B) It is synchronized by default
  • (C) It maintains elements in sorted order
  • (D) It allows multiple null values

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