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 would happen if you try to use an uninitialized object reference?

Compilation error
NullPointerException
It would be initialized to a new object of its class
Nothing, it's a valid operation

The correct answer is: NullPointerException

If you try to use an uninitialized object reference, you will receive a NullPointerException. This means that you tried to access an object that does not exist or has not been created yet. Option A is incorrect because a compilation error occurs when there is a mistake in the code itself, such as a syntax error. Option C is incorrect because an uninitialized object reference does not automatically get initialized to a new object. Option D is incorrect because it is not a valid operation to use an uninitialized object reference.