Java Deque MCQs with answers Page - 3

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Q. Which Deque method throws an exception if the element cannot be added at the front?

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

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Q. Which Deque method is used to simulate queue behavior by adding to the rear?

  • (A) addFirst()
  • (B) push()
  • (C) offerLast()
  • (D) insertEnd()

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Q. Which method in Deque returns but does not remove the first element?

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

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Q. Which Deque method acts similarly to `Stack.pop()`?

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

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Q. Which method in Deque is used to remove the last element and return it?

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

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Q. What will `peekLast()` return on an empty Deque?

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

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Q. Which of the following is true for ArrayDeque?

  • (A) Allows null elements
  • (B) Thread-safe
  • (C) Does not allow null elements
  • (D) Maintains natural order

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Q. Which of the following operations is not supported directly by Deque?

  • (A) Insertion at both ends
  • (B) Removal from both ends
  • (C) Random access by index
  • (D) Peeking from both ends

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Q. Which Deque method throws NoSuchElementException if the Deque is empty?

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

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Q. What is the default capacity of an ArrayDeque?

  • (A) 10
  • (B) 16
  • (C) 32
  • (D) Unlimited

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