Java Deque MCQs with answers Page - 5

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A

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Q. Which method in Deque is specifically designed to simulate stack's push operation?

  • (A) addFirst()
  • (B) offerFirst()
  • (C) push()
  • (D) enqueue()

A

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Q. Which method is equivalent to stack's pop in Deque?

  • (A) pop()
  • (B) removeLast()
  • (C) pollLast()
  • (D) dequeue()

A

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Q. Which Deque method inserts an element at the tail without throwing exception?

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

A

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Q. What does `getLast()` do in a Deque?

  • (A) Returns and removes the last element
  • (B) Returns the last element without removing
  • (C) Inserts element at the end
  • (D) Removes the last element

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Q. Which of the following is a blocking method for retrieving and removing the head?

  • (A) takeFirst()
  • (B) pop()
  • (C) poll()
  • (D) removeFirst()

A

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Q. Which Deque operation removes and returns the last element, blocking if empty?

  • (A) pop()
  • (B) removeLast()
  • (C) pollLast()
  • (D) takeLast()

A

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Q. Which implementation allows thread-safe Deque operations without blocking?

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

A

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Q. Which method removes and returns the head element from a Deque?

  • (A) pollLast()
  • (B) pollFirst()
  • (C) getFirst()
  • (D) element()

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Q. Which method in Deque is considered fail-fast if structure is modified concurrently?

  • (A) iterator()
  • (B) peek()
  • (C) add()
  • (D) offer()

A

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Q. What is returned by `peekFirst()` if the Deque is empty?

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

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