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

Disable ads (and more) with a membership for a one time $2.99 payment

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!

Practice this question and more.

In the context of generics, why might you use wildcards?

To explicitly limit the types you can work with in a method
To increase runtime performance by using dynamic casts
To create more specific type bounds than raw types offer
To allow for broader polymorphism with generic types

The correct answer is: To allow for broader polymorphism with generic types

Wildcards in generics are used to allow for broader polymorphism, meaning that it allows the generic code to work with a wider variety of types. This can be useful when you are unsure of the specific type you will be working with or when you want to increase the flexibility of your code. Options A, C, and D do not accurately describe the purpose of using wildcards in generics. Option A describes using explicit type limits, which is typically done with generic type parameters. Option C mentions raw types, which are actually used when a generic type is unknown, and wildcards are used to make it more specific. Option B describes a different concept altogether, using dynamic casts for performance.