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.

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!

Practice this question and more.

What is the primary functionality of a Null object based on the description?

To serve as a functional placeholder for debugging purposes
To throw exceptions when methods are called on it
To act as an intelligent placeholder for null
To log method calls for later review

The correct answer is: To act as an intelligent placeholder for null

The primary functionality of a Null object is to act as an intelligent placeholder for null. This means that when a method is called on the Null object, it will not throw an exception like option B suggests, but will instead handle the request in an intelligent and appropriate manner. Option A is incorrect because Null objects are not primarily used for debugging purposes. Option D is also incorrect as it suggests its purpose is to log method calls, which is not necessarily a primary functionality of a Null object. Therefore, option C is the best answer as it accurately describes the main purpose of a Null object.