Mastering Java 2025 – 400 Free Practice Questions to Pass the 'Thinking in Java' Exam

Question: 1 / 510

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

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.

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