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!

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What is a consequence of a class with all private constructors?

It cannot be instantiated
It enables singleton pattern
It allows subclassing
It is automatically final

The correct answer is: It cannot be instantiated

A consequence of a class with all private constructors is that it cannot be instantiated. This means that an object cannot be created from this class, making it essentially useless for any practical purpose. Option B is incorrect because the singleton pattern does not necessarily require all private constructors. Only one constructor needs to be private to enforce the singleton pattern. Option C is incorrect because a class with all private constructors cannot be subclassed since the subclass would not be able to access the private constructor. Option D is incorrect because a class with all private constructors is not automatically final, which means it can still be extended by other classes.