Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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Mastering Java: The Ultimate Quiz for 'Thinking in Java'. Dive deep into Java with multiple-choice questions. Challenge yourself with quiz questions designed to test and improve your understanding of the 'Thinking in Java' book. Get ready for your exam!

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What restriction does using <? super T> in a generic class or method impose?

  1. The class or method cannot accept arguments of type T

  2. Objects of T or its superclasses can be added to a collection

  3. The class or method cannot return objects of general types

  4. Only objects of type Object can be used with the class or method

The correct answer is: Objects of T or its superclasses can be added to a collection

When using a generic class or method with the <? super T> restriction, objects of type T or any of its superclasses can be added to a collection. This means that objects of more specific types cannot be added, but it allows for a wider range of objects to be accepted. Options A, C, and D are incorrect because they imply more limitations on the type of objects that can be used, while option B provides the most accurate description of the restriction imposed by <? super T>.

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