Java Generics Wildcarding With Multiple Classes

Question

I want to have a Class object, but I want to force whatever class it represents to extend class A and implement interface B.

I can do:

Class

        

Answer 1

You can't do it with "anonymous" type parameters (ie, wildcards that use ?), but you can do it with "named" type parameters. Simply declare the type parameter at method or class level.

import java.util.List;
interface A{}
interface B{}
public class Test> {
    T t;
}