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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What must be implemented for a class to execute a task that returns a result after completion?

  1. Runnable

  2. Callable

  3. Executor

  4. Futures

The correct answer is: Callable

A and C are incorrect because they do not return a result after completion. A Runnable does not return a value and an Executor is used to manage and execute threads, not tasks that return a result. D is not the best answer because Futures alone cannot implement a task, it is a mechanism for asynchronously retrieving results from a concurrent task. Callable is the closest match to what the question is asking for.

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