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      Question

      In Java, which interface defines the basic operations for a queue, and which class is a common concrete implementation that supports these operations with efficient O(1) time complexity for offer and poll?

      A List, ArrayList Correct Answer Incorrect Answer
      B Set, HashSet Correct Answer Incorrect Answer
      C Queue, LinkedList Correct Answer Incorrect Answer
      D Deque, ArrayDeque Correct Answer Incorrect Answer
      E Collection, Vector Correct Answer Incorrect Answer

      Solution

      In Java, java.util.Queue is the interface that defines queue operations. java.util.LinkedList is a common concrete class that implements the Queue interface and provides O(1) time complexity for offer() (enqueue) and poll() (dequeue) operations when used as a queue.

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