Question

I have:

public class<E extends aninterface> AClass{

    public AClass(){
    }

    public void amethod(E element){
        //something
    }

}

public class B implements aninterface{

}

in call code:

aninterface f = new B();
AClass<B> ac = new AClass<B>();
ac.amethod(f);

It say f is type aninterface but parameter is type ‘E’

I not understand what point of generics if I cannot do this?

Answer 1

Because AClass<B>.amethod() expects a B as the argument. But you’re passing it an aninterface.