Java Collections MCQs with answers Page - 2

You will find multiple-choice questions (MCQs) related to #Java Collections here. Go through these questions to prepare effectively for your upcoming exams and interviews.

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Q. Which class maintains insertion order in a Set?

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

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Q. Which method is used to remove all elements from a collection?

  • (A) removeAll()
  • (B) clear()
  • (C) deleteAll()
  • (D) flush()

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Q. Which interface provides methods to operate on a queue?

  • (A) List
  • (B) Deque
  • (C) Set
  • (D) SortedSet

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Q. Which collection class allows null key and multiple null values?

  • (A) HashMap
  • (B) Hashtable
  • (C) TreeMap
  • (D) LinkedHashMap

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Q. Which of the following collection types does not allow duplicates?

  • (A) ArrayList
  • (B) HashMap
  • (C) HashSet
  • (D) LinkedList

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Q. Which class implements a map that maintains insertion order?

  • (A) TreeMap
  • (B) HashMap
  • (C) LinkedHashMap
  • (D) EnumMap

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Q. Which method is used to remove a specific element from a collection?

  • (A) remove()
  • (B) delete()
  • (C) discard()
  • (D) exclude()

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Q. Which class is best for implementing a stack in Java?

  • (A) Vector
  • (B) Stack
  • (C) ArrayList
  • (D) Queue

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