When overriding a method, the signature must be the same.
That includes the exact parameter types.
Alger
Nathan Arizona schrieb:
>
> I am passing in a custom event that extends Event into a class that
> implements an interface. I get an incorrect signature and I am
> wondering why? Why do I not get the benefit of polymorphism?
>
> I have an interface as follows:
>
> package myCom.controller
> {
> import flash.events.Event;
>
> public interface ICommand
> {
> function execute(event:Event):void
> }
> }
>
> I have a pseudo abstract class as follows:
> package myCom.controller
> {
> import flash.events.Event;
> import myCom.view.events.LoginEvent;
>
> public class Command implements ICommand
> {
>
> public function execute(event:Event):void
> {
> }
>
> }
> }
>
> Here is a LoginCommand that extends the Command Class
>
> package myCom.controller
> {
> import flash.events.Event;
> import myCom.view.events.LoginEvent;
> import myCom.model.DashboardModel;
> import mx.rpc.remoting.RemoteObject;
> import mx.rpc.events.ResultEvent;
> import mx.rpc.events.FaultEvent;
> import myCom.model.User;
> import com.adobe.crypto.MD5;
>
> public class LoginCommand extends Command
> {
> public function LoginCommand() {
>
> }
>
> public override function execute(event:LoginEvent):void {
>
> }
>
> public function myResult(event:ResultEvent):void {
> var temp:User;
> temp = User(event.result);
> trace("myEvent is done");
> }
>
> public function resultFault(event:FaultEvent):void {
> trace("myeventFault" + event.message.toString());
> }
>
> }
> }
>
> I get an error saying that I have an incompatible signature because my
> execute function is expecting a LoginEvent. The LoginEvent extends
> Event. Commands execute signature expects an Event. Why do I not get
> the advantage of polymorphism here?
>
> Thanks for your insight.
>
> Arizona
>
>
