可以在java中扩展泛型类吗？

Question

I mean

public class Generic<T> extends T{
}

if I have two classes, in my case it is Response and Request, and several classes with own fields, i want extend response or request depending on the situation or vice versa extend classes. But i do not want to create another classes

Answer 1

That's impossible logically per java as by definition of inheritance you always extend a class not a type . If you trying to do so, you will see following error:

Error:(3, 48) java: unexpected type
  required: class
  found:    type parameter T

So, it clear that,

A class can not inherit from it's type