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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In polymorphism, what does 'upcasting' refer to?

Casting an object to a more specific class
Casting an object to a more general class
Casting an object without changing its type
Casting an object to a sibling class

The correct answer is: Casting an object to a more general class

Upcasting refers to the process of casting an object to a more general, or superclass, type. This allows the object to inherit the properties and methods of the superclass, but it may also have additional properties and methods specific to its original class. Option A is incorrect because casting an object to a more specific class is known as 'downcasting'. Option C is incorrect because it does not involve changing the type of the object at all. Option D is incorrect because casting an object to a sibling class is not possible in polymorphism, as sibling classes have different parent classes.