Java Queue MCQs with answers Page - 4

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

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Q. Which method checks if a queue contains a specific element?

  • (A) has()
  • (B) includes()
  • (C) contains()
  • (D) find()

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Q. Which of these does not implement the Queue interface?

  • (A) PriorityQueue
  • (B) LinkedList
  • (C) ArrayDeque
  • (D) HashMap

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Q. In which package is the `Queue` interface found?

  • (A) java.io
  • (B) java.util
  • (C) java.lang
  • (D) java.queue

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Q. Which method returns but does not remove the head of the queue, or null if empty?

  • (A) element()
  • (B) peek()
  • (C) poll()
  • (D) top()

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Q. Which collection supports capacity-bound queues?

  • (A) LinkedList
  • (B) ArrayList
  • (C) ArrayBlockingQueue
  • (D) TreeMap

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Q. Which BlockingQueue allows elements to be delayed before becoming available?

  • (A) DelayQueue
  • (B) ArrayBlockingQueue
  • (C) SynchronousQueue
  • (D) ConcurrentLinkedQueue

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Q. Which method is used to add an element at the tail of the queue?

  • (A) push()
  • (B) append()
  • (C) add()
  • (D) enqueue()

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Q. Which queue implementation gives highest-priority element first?

  • (A) ArrayDeque
  • (B) LinkedList
  • (C) PriorityQueue
  • (D) HashSet

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Q. Which interface must elements implement to be used in PriorityQueue?

  • (A) Comparable
  • (B) Runnable
  • (C) Serializable
  • (D) Iterable

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Q. Which of these is NOT a property of a queue?

  • (A) FIFO behavior
  • (B) Can be bounded or unbounded
  • (C) Can contain duplicate elements
  • (D) Supports key-value mapping

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