Java Deque MCQs with answers Page - 4

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A

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Q. Which of these is a thread-safe implementation of Deque?

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

A

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Q. Which Deque method behaves like a queue’s poll() method?

  • (A) pollFirst()
  • (B) removeLast()
  • (C) push()
  • (D) addFirst()

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Q. Which method removes and returns the first element in Deque?

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

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Q. Which method is NOT part of the Deque interface?

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

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Q. Which method removes and returns the first element, throwing an exception if empty?

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

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Q. In which package is the Deque interface found?

  • (A) java.lang
  • (B) java.util
  • (C) java.queue
  • (D) java.collection

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Q. Which Deque method inserts an element and returns false if capacity is full?

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

A

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Q. Which method is used to insert an element at the front in a blocking deque?

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

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Q. Which method inserts at the tail and blocks if necessary?

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

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Q. Which of these Deque implementations supports blocking operations?

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

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