Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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What kind of queue is a DelayQueue?

  1. FIFO (First In First Out)

  2. LIFO (Last In First Out)

  3. Priority

  4. None of the above

The correct answer is: Priority

A DelayQueue is a special type of queue where items are removed from the queue based on their expiration time. This is different from a FIFO queue (A), which removes items in the same order they were added, or a LIFO queue (B), which removes the most recently added item first. Additionally, a DelayQueue does not prioritize items based on a certain criteria, so it is not classified as a Priority queue (C). Option D is incorrect as a DelayQueue is a specific type of queue and therefore cannot be "none of the above".

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