What is the benefit of extending a generic by specifying the new type as actual type of generic

Question

I saw this pattern somewhere:

class A extends B {

}

This structure is a little unusual to extend a generic by specifying the new

Answer 1

Take this example:

E extends Comparable

This means that E must be a type that knows how to compare to itself, hence, the recursive type definition.

Don't know if it has any official names, but I would call it recursive generic type pattern.