Implementing Generic Interface in Java

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

public interface Event{}
public class AddressChanged implements Event{}
public class AddressDiscarded implements Event{}

public interface Handles<T extends Event>{
    public void handle(T event);
}

I want to implement this Handles interface like this:

public class AddressHandler implements Handles<AddressChanged>, Handles<AddressDiscarded>{
    public void handle(AddressChanged e){}
    public void handle(AddressDiscarded e){}
}

But java doesn't allow implementing Handles twice using the Generic. I was able to accomplish this with C#, but cannot figure a workaround in java without using Reflection or instanceof and casting.

Is there a way in java to implement the Handles interface using both generic interfaces? Or perhaps another way to write the Handles interface so the end result can be accomplished?

Solution

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<Event>{
    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){}
}