Generic methods and inheritance

Question

Hello,
I have a class structure like this:
A - - - - > IA (A implements IA)
C - - - - > IC -------> IB (C implements IC extends IB)
In IA I have a method create that returns <T extends IB<T>>:
public interface IA {
    public <T extends IB<T>> T create();
}IB:
public interface IB<T> {  
}IC extends IB like this:
public interface IC extends IB<IC> { 
}C implements IC:
public class C implements IC{
}Finally the problem: I wan to implement A in order to return an IC in the create method:
public class A implements IA{
    public IC create() {
        IC c = new C();
        return c;
}This compiles but I get this warning: 'A.java uses unchecked or unsafe operations.'
What is the proper way to create such a structure?
Thanks,
Miguel

Answer 1

you can try giving more horrible things, like giving the class you want in the method params, like :
create(Class<IB> clazz);and then use reflection to create the instance :
clazz.getInstance();But it's quite heavy, I think...