Java Deque MCQs with answers Page - 7

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Q. Which method of Deque is used to insert an element at the beginning and throws an exception if the deque is full?

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

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Q. What is the primary difference between offerFirst() and addFirst() in Deque?

  • (A) addFirst() is slower
  • (B) offerFirst() throws exception when full
  • (C) addFirst() throws exception, offerFirst() returns false
  • (D) offerFirst() adds to tail

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Q. Which method removes and returns the first element, or returns null if empty?

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

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Q. What exception is thrown by getFirst() when the Deque is empty?

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

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Q. Which of the following Deque methods are used for stack-like behavior?

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

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Q. Which Deque implementation is suitable for concurrent environments with blocking features?

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

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

  • (A) Removes the head element
  • (B) Returns head element without removing it
  • (C) Throws exception if deque is empty
  • (D) Returns the last element

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Q. In which case would putFirst() block?

  • (A) Deque is empty
  • (B) Deque is full
  • (C) Element already exists
  • (D) Deque contains nulls

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Q. Which operation removes the last element, blocking if necessary?

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

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Q. Which of these Deque methods is safe to use when the deque may be empty?

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

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