What are some advanced concepts in Java Generics?

What are some advanced concepts in Java Generics?

Advanced concepts in Java Generics include bounded type parameters, wildcards, and type erasure. Would you like to explore any of these?

Can you explain bounded type parameters?

Sure! Bounded type parameters allow you to restrict the types that can be used as arguments for a type parameter. For example, you can specify that a type parameter must be a subclass of a certain class or implement a specific interface.

What about wildcards? How do they work?

Wildcards in Java Generics are represented by the question mark (?) and allow for flexibility in specifying types. There are three types: unbounded wildcards, bounded wildcards (upper and lower), and wildcard capture.

Can you give an example of a bounded wildcard?

Certainly! A bounded wildcard can be defined as <? extends Number> which means it can accept any type that is a subclass of Number, like Integer or Double.