Java Deque MCQs with answers Page - 2

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Q. Which of the following is a correct characteristic of ArrayDeque?

  • (A) It allows null elements
  • (B) It is thread-safe
  • (C) It is faster than Stack for stack operations
  • (D) It maintains insertion order

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Q. Which operation simulates stack behavior using Deque?

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

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Q. Which operation simulates queue behavior using Deque?

  • (A) push() and pop()
  • (B) offerLast() and pollFirst()
  • (C) addLast() and removeLast()
  • (D) add() and pop()

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Q. What does `pollFirst()` return if the Deque is empty?

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

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Q. What is the result of calling `pop()` on an empty Deque?

  • (A) null
  • (B) 0
  • (C) NoSuchElementException
  • (D) IllegalArgumentException

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Q. Which method is used to remove the last element without exception?

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

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Q. Which Deque method inserts an element at the tail and throws exception if full?

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

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Q. Which implementation of Deque should not be used in multi-threaded environments without synchronization?

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

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Q. Which interface does Deque extend?

  • (A) Queue
  • (B) List
  • (C) Collection
  • (D) Map

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Q. Which Java class provides a blocking deque implementation?

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

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