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

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Prepare for your Java exam with our ultimate quiz based on 'Thinking in Java'. Engage with expertly crafted questions that enhance your learning process. Perfect for Java enthusiasts looking to solidify their knowledge!

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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How can covariance be achieved with generics?

Using bounded wildcards
By directly casting List types
Through generic method arguments
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.