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.

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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 required to add an Apple object to a List in the example provided?

  1. The List must be of type Apple

  2. The List must use a wildcard extending Apple

  3. The List must be of type Fruit

  4. Any of the listed types can be used

The correct answer is: The List must use a wildcard extending Apple

To add an Apple object to a List, the List must use a wildcard extending Apple. This is because Lists are type-specific and can only contain objects of the specified type or its subclasses. Option A is incorrect because it limits the List to only contain objects of type Apple, but not its subclasses. Option C is incorrect because it would not allow for other types of Fruit besides Apple to be added to the List. Option D is incorrect because it does not specify the type, which would result in a compilation error. Therefore, the only correct option is B, as it allows for any subclass of Apple to be added to the List.

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