What is the importance of variance in generics?

What is the importance of variance in generics?

Variance in generics allows for more flexible and reusable code. It helps define how subtypes relate to super types.

Can you explain the difference between covariant and contravariant types?

Sure! Covariant types allow a subtype to be substituted for a supertype, while contravariant types allow a supertype to be substituted for a subtype.

Why is this flexibility important in programming?

This flexibility is crucial for creating APIs and libraries that can work with a wide range of types without losing type safety.

Are there any practical examples of using variance in real-world applications?

Yes! For instance, in a collection framework, you might want to allow a list of a specific type to be treated as a list of a more general type.