but I do not know how generics work with two param...

# getting-started

[ivano]

but I do not know how generics work with two parameters

[leolima]

Pretty much the same as with one parameter. Map, for instance, has two type parameters: Map<K,V>

[ivano]

I know Leonardo how one parameter works

[ivano]

but two I do not get why I should need a second contravariant type?

[ivano]

to create some new subclasses?