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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How can covariance be achieved with generics?

  1. Using bounded wildcards

  2. By directly casting List types

  3. Through generic method arguments

  4. Covariance is not possible with generics

The correct answer is: Using bounded wildcards

By using bounded wildcards, covariance can be achieved in generics. This allows for a specific type to be specified as the upper bound for the wildcard, allowing for the generic to only accept objects of that type or its subclasses. This allows for more flexibility and type safety when dealing with generic types. Options B and C are incorrect because they do not directly address the concept of covariance in generics. Option D is incorrect because it is possible to achieve covariance through bounded wildcards, making it a valid option.

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