Implementing Generic Interface in Java

Question

I have a Java generics question I was hoping someone could answer. Consider the following code:

public interface Event{}
public class AddressChanged implemen         


        

Answer 1

You can't do that in Java. You can only implement one concrete realization of the same generic interface. I would do this instead:

public class AddressHandler implements Handles{
    public void handle(Event e){
      if(e instanceof AddressDiscarded){
         handleDiscarded(e);
      } else if(e instanceof AddressChanged){
         handleChanged(e);
      }
    }
    public void handleDiscarded(AddressDiscarded e){}
    public void handleChanged(AddressChanged e){}
}