Java Deque MCQs with answers Page - 8

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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A

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Q. Which Deque method is equivalent to Stack’s peek()?

  • (A) peekLast()
  • (B) peekFirst()
  • (C) getLast()
  • (D) top()

A

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Q. What does `removeLast()` return when the deque is empty?

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

A

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Q. Which method returns the number of elements in a Deque?

  • (A) size()
  • (B) length()
  • (C) count()
  • (D) getSize()

A

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Q. What is the return type of `pollFirst()`?

  • (A) boolean
  • (B) int
  • (C) Object
  • (D) Depends on the generic type

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Q. Which is a common use-case of Deque in algorithm design?

  • (A) Priority sorting
  • (B) Depth-first traversal
  • (C) Sliding window problems
  • (D) Sorting data

A

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Q. Which Deque implementation does not support null elements?

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

A

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Q. Which method in Deque throws exception when removing from an empty deque?

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

A

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Q. What is the time complexity of insertion at both ends in ArrayDeque?

  • (A) O(n)
  • (B) O(log n)
  • (C) O(1)
  • (D) O(n log n)

A

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Q. Which method is best to implement LIFO with Deque?

  • (A) offerLast() and pollLast()
  • (B) push() and pop()
  • (C) addLast() and removeFirst()
  • (D) offerFirst() and peekLast()

A

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Q. Which method would you use to block a thread until space is available at the tail?

  • (A) addLast()
  • (B) offerLast()
  • (C) putLast()
  • (D) push()

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