Java Deque MCQs with answers Page - 1

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Q. What does Deque stand for in Java?

  • (A) Double Queue
  • (B) Data Queue
  • (C) Double-Ended Queue
  • (D) Default Queue

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Q. Which class implements the Deque interface in Java?

  • (A) ArrayList
  • (B) ArrayDeque
  • (C) LinkedList
  • (D) Both b and c

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Q. Which method adds an element at the front of the Deque?

  • (A) add()
  • (B) offerFirst()
  • (C) push()
  • (D) insert()

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Q. Which method removes and returns the last element of a Deque?

  • (A) pop()
  • (B) pollLast()
  • (C) removeFirst()
  • (D) peekLast()

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Q. What exception is thrown if removeLast() is called on an empty Deque?

  • (A) NullPointerException
  • (B) IllegalStateException
  • (C) NoSuchElementException
  • (D) IllegalArgumentException

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Q. Which method retrieves, but does not remove, the first element of a Deque?

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

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Q. Which method is used to add an element at the end of a Deque?

  • (A) offerLast()
  • (B) addEnd()
  • (C) append()
  • (D) push()

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Q. What will `push()` do in a Deque?

  • (A) Remove element
  • (B) Insert at the head
  • (C) Insert at the tail
  • (D) Throw exception

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Q. Which method retrieves but does not remove the last element of a Deque?

  • (A) peekLast()
  • (B) pollLast()
  • (C) getLast()
  • (D) element()

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Q. Which method removes the first element in a Deque and throws exception if empty?

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

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