Java Collections MCQs with answers Page - 1

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 interface is the root of the Java Collections framework?

  • (A) Map
  • (B) List
  • (C) Collection
  • (D) Iterable

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Q. Which of the following allows duplicate elements?

  • (A) Set
  • (B) Map
  • (C) List
  • (D) HashSet

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Q. Which implementation class provides a sorted set?

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

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Q. Which class implements a doubly linked list?

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

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Q. Which collection class is thread-safe?

  • (A) ArrayList
  • (B) HashMap
  • (C) Vector
  • (D) TreeMap

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Q. Which interface extends Collection and represents a sequence of elements?

  • (A) Set
  • (B) List
  • (C) Map
  • (D) Queue

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Q. What is the default capacity of an ArrayList in Java?

  • (A) 5
  • (B) 8
  • (C) 10
  • (D) 0

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Q. Which class implements the Set interface and does not maintain order?

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

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Q. Which interface is used to store key-value pairs?

  • (A) Set
  • (B) Map
  • (C) List
  • (D) Queue

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Q. Which method is used to add an element to a List?

  • (A) insert()
  • (B) append()
  • (C) add()
  • (D) put()

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