Java Set MCQs with answers Page - 6

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. Can HashSet contain different types of objects?

  • (A) Yes, if not using generics
  • (B) No, only homogeneous types
  • (C) Yes, only null values
  • (D) Yes, but only if extending the same parent

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Q. What does Set's `equals()` method check?

  • (A) Whether order and values match
  • (B) Only if objects are same
  • (C) Whether both Sets contain the same elements
  • (D) Whether Sets have same memory reference

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Q. What will be the result of: new HashSet<>(Arrays.asList(1,2,2,3))?

  • (A) [1,2,2,3]
  • (B) [1,2,3]
  • (C) [1,2,2]
  • (D) Error

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Q. What is returned by Set's `add()` method when element already exists?

  • (A) true
  • (B) false
  • (C) null
  • (D) exception

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Q. Which class is most efficient for representing a set of enum constants?

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

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Q. Which operation is NOT supported by Set?

  • (A) Add element
  • (B) Remove element
  • (C) Get element by index
  • (D) Check for presence of element

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Q. Which of the following Set implementations is thread-safe?

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

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Q. Which Java version introduced NavigableSet?

  • (A) Java 5
  • (B) Java 6
  • (C) Java 7
  • (D) Java 8

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Q. Which of the following methods belong to the NavigableSet interface?

  • (A) ceiling(), floor(), higher(), lower()
  • (B) insert(), update(), delete()
  • (C) append(), prepend()
  • (D) sort(), shuffle()

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Q. Which of the following Set implementations is not ordered and not sorted?

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

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