Java Set MCQs with answers Page - 10

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 check if a Set contains all elements of a Collection?

  • (A) hasAll()
  • (B) containsAll()
  • (C) isSubset()
  • (D) allMatch()

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Q. Which method is used to remove all elements that satisfy a given condition?

  • (A) remove()
  • (B) clear()
  • (C) removeIf()
  • (D) deleteWhere()

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Q. Which collection type implements both Set and SortedSet?

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

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Q. What is the best way to make a Set read-only?

  • (A) Set.unmodifiableSet(set)
  • (B) Collections.lockSet(set)
  • (C) Set.readOnly(set)
  • (D) set.lock()

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Q. Which method creates a stream from a Set?

  • (A) stream()
  • (B) getStream()
  • (C) toStream()
  • (D) asStream()

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Q. Which of the following is a Set backed by a concurrent skip list?

  • (A) CopyOnWriteArraySet
  • (B) TreeSet
  • (C) ConcurrentSkipListSet
  • (D) SynchronizedSet

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Q. What is the result of `HashSet.toArray(new Integer[0])`?

  • (A) Integer array with all elements
  • (B) Compilation error
  • (C) ArrayIndexOutOfBoundsException
  • (D) null

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Q. Which of the following is NOT an advantage of using Set?

  • (A) Fast lookup
  • (B) Prevents duplicates
  • (C) Index-based access
  • (D) Mathematical set operations

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

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

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