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

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Mastering Java: The Ultimate Quiz for 'Thinking in Java'. Dive deep into Java with multiple-choice questions. Challenge yourself with quiz questions designed to test and improve your understanding of the 'Thinking in Java' book. Get ready for your exam!

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The DelayQueue holds elements that are instances of which interface?

Runnable
Callable
Future
Delayed

The correct answer is: Delayed

The DelayQueue holds elements that are instances of the Delayed interface, which allows for scheduling an object to be retrieved after a specified delay. Option A, Runnable, is incorrect because it is used to create a thread without any return value. Option B, Callable, is incorrect because it is used to define a task that can return a result, but is not specifically related to a delay. Option C, Future, is incorrect because it represents the result of an asynchronous computation and is not directly related to delays. Therefore, the correct answer is D, as it is the only interface specifically designed for delaying the retrieval of objects from a queue.