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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Is it possible to upcast from a derived class to a base class in Java?

Casting a base class reference to a derived class
Casting a derived class reference to a base class
Forcing garbage collection of a derived class object
Creating an abstract method in the derived class

The correct answer is: Casting a base class reference to a derived class

Upcasting in Java refers to the act of casting a reference of a base class to a reference of a derived class. This allows for the use of methods and variables that are specific to the derived class. Option B is incorrect because it refers to downcasting instead, which is the opposite of upcasting. Option C is incorrect because garbage collection is not related to upcasting. Option D is incorrect because creating an abstract method is not specific to upcasting.