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

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Dive into the depths of Java with our quiz based on "Thinking in Java, Fourth Edition" by Bruce Eckel. Test your knowledge, solidify concepts, and prepare for certification with challenging questions and insightful feedback.

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Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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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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