Java Queue MCQs with answers Page - 7

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. What is the result of calling `poll()` on an empty `LinkedList` used as a Queue?

  • (A) Throws NoSuchElementException
  • (B) Returns null
  • (C) Returns 0
  • (D) Throws NullPointerException

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Q. Which of the following queues orders elements in the order they were inserted?

  • (A) PriorityQueue
  • (B) DelayQueue
  • (C) LinkedList (as Queue)
  • (D) TreeMap

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Q. What will `add(null)` do in a `LinkedList` used as a Queue?

  • (A) Add null successfully
  • (B) Throw NullPointerException
  • (C) Remove all nulls
  • (D) Block the thread

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Q. Which method is preferred over `add()` to avoid exceptions when inserting?

  • (A) put()
  • (B) offer()
  • (C) enqueue()
  • (D) insert()

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Q. Which Java collection is best for implementing a breadth-first search?

  • (A) Stack
  • (B) Queue
  • (C) Set
  • (D) TreeMap

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Q. Which queue implementation can store elements with the same delay in any order?

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

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Q. Which method retrieves, but does not remove, the head of the queue and throws an exception if the queue is empty?

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

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Q. Which queue is suitable for message-passing between threads?

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

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Q. Which method is used to add an element to both ends in a Deque?

  • (A) offerFirst() and offerLast()
  • (B) push() and pop()
  • (C) addFront() and addBack()
  • (D) enqueue() and dequeue()

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Q. Which Queue method is atomic and thread-safe in a ConcurrentLinkedQueue?

  • (A) add()
  • (B) offer()
  • (C) poll()
  • (D) All of the above

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