Java Set MCQs with answers Page - 8

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 `descendingSet()` method of NavigableSet return?

  • (A) A random subset
  • (B) A reversed view of the Set
  • (C) Only null elements
  • (D) A copy of the Set

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Q. Can EnumSet be empty?

  • (A) No
  • (B) Yes, using EnumSet.noneOf()
  • (C) Yes, using EnumSet.clear()
  • (D) Only if using TreeMap

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Q. Which implementation allows predictable iteration order in Set?

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

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Q. Which of these Set classes can be used with null values?

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

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Q. Which operation on TreeSet returns the greatest element less than the given element?

  • (A) higher()
  • (B) ceiling()
  • (C) floor()
  • (D) lower()

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Q. Which of these is TRUE for HashSet?

  • (A) It is thread-safe
  • (B) It preserves insertion order
  • (C) It allows multiple null values
  • (D) It allows constant-time operations

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Q. Which Set implementation is ideal when concurrency is required and order matters?

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

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Q. What is the result of calling clear() on a Set?

  • (A) Removes last element
  • (B) Removes only null elements
  • (C) Removes all elements
  • (D) Throws exception

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Q. Which of these is best suited for creating a range of enum values in a Set?

  • (A) EnumSet.range()
  • (B) TreeSet.range()
  • (C) HashSet.subSet()
  • (D) Set.rangeOf()

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Q. Which method in NavigableSet returns the least element greater than the given element?

  • (A) lower()
  • (B) higher()
  • (C) floor()
  • (D) ceiling()

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