🚀 go-pugleaf

maybe you have to cast your classes to implemented versions of befehl,
like for instance myCommand.

greetings
casper

Alex wrote:

> Hi,
>
> I�m trying to load some classes with my own classloader and cast them to an
> interface they implement but this causes a ClassCastException.
>
> Some details:
>
> I want an application to be able to execute commands that are represented by
> classes and who implement an interface called Befehl (german word for
> "command")
> This is what my interface looks like:
> package mypackage;
> public interface Befehl {
>   public void execute();
>   ...
> }
> Example for the "command-classes"
> package mypackage.befehle;
> public class MyCommand implements Befehl {
>   public void someFunction () {...}
>
>   public void execute  () {...}
> }
>
> This is what I want to to:
> - first load a class from a certain directory (and resolve it)
>                 Class myClass = myClassLoader.load
> ("mypackage.befehle.myCommand");            -> seems to be working
> - cast the class to "Befehl" and save it (in Hashtable)
>                 Befehl b = (Befehl)
>                       -> throws ClassCastException !!!
>
> WHAT I REALLY DON�T UNDERSTAND:
> I wanted to be sure and tried this:
>             Class test = myClass.getInterfaces()[0];
>             System.out.println ("Interface: "+test.getName());
> I COULDN�T BELIEVE IT BUT THIS RETURNS:      "Interface: Befehl"
> I don�t understand why the class tell�s me that it implements the interface
> "Befehl" but when I try to cast it into this interface an Exception is
> thrown.
>
> Please help, I don�t know where to search my mistake.
>
> Thank you very much,
> Alex.