Java Deque MCQs with answers Page - 6

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

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Q. Which is more memory-efficient for stack operations: Stack or ArrayDeque?

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

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Q. Which method throws IllegalStateException if a bounded deque is full?

  • (A) addFirst()
  • (B) offerFirst()
  • (C) putFirst()
  • (D) enqueueFirst()

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Q. Which of the following is not a valid Deque method?

  • (A) removeFirst()
  • (B) putLast()
  • (C) insertEnd()
  • (D) pollLast()

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Q. Which method will return null when called on an empty Deque?

  • (A) pop()
  • (B) removeFirst()
  • (C) peekFirst()
  • (D) getFirst()

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Q. Which method waits if necessary to insert an element at the front of a deque?

  • (A) addFirst()
  • (B) offerFirst()
  • (C) putFirst()
  • (D) enqueueFirst()

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Q. Which Java class is best for LIFO and FIFO both using same interface?

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

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Q. Which method returns true if the element was added successfully at front?

  • (A) addFirst()
  • (B) offerFirst()
  • (C) putFirst()
  • (D) insertFirst()

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Q. Which method removes the element at the front without throwing exception?

  • (A) pollFirst()
  • (B) removeFirst()
  • (C) pop()
  • (D) getFirst()

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Q. Which Deque implementation is backed by an array and resizes as needed?

  • (A) LinkedBlockingDeque
  • (B) ConcurrentLinkedDeque
  • (C) ArrayDeque
  • (D) PriorityQueue

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Q. Which method is used to retrieve and remove the first element, blocking if necessary?

  • (A) takeFirst()
  • (B) pollFirst()
  • (C) peekFirst()
  • (D) removeFirst()

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