Java Queue MCQs with answers Page - 2

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 inserts an element, waiting if necessary for space?

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

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Q. Which class is not part of the java.util.concurrent package?

  • (A) ArrayBlockingQueue
  • (B) ConcurrentLinkedQueue
  • (C) LinkedBlockingQueue
  • (D) PriorityQueue

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Q. What is the default ordering in PriorityQueue?

  • (A) Insertion order
  • (B) LIFO
  • (C) Natural order
  • (D) Reverse order

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Q. Which interface extends Queue to support blocking operations?

  • (A) ConcurrentQueue
  • (B) BlockingQueue
  • (C) PriorityQueue
  • (D) ThreadQueue

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Q. Which queue implementation is unbounded?

  • (A) ArrayBlockingQueue
  • (B) LinkedBlockingQueue
  • (C) SynchronousQueue
  • (D) PriorityBlockingQueue

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

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

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Q. Which exception is thrown by `add()` if the queue is full?

  • (A) IllegalStateException
  • (B) NullPointerException
  • (C) QueueOverflowException
  • (D) IllegalArgumentException

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Q. Which queue implementation does not store elements but transfers between threads?

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

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Q. What does `peek()` return if the queue is empty?

  • (A) null
  • (B) false
  • (C) throws exception
  • (D) 0

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Q. Which queue implementation is best suited for high-concurrency, non-blocking environments?

  • (A) BlockingQueue
  • (B) ConcurrentLinkedQueue
  • (C) PriorityQueue
  • (D) ArrayDeque

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