Cast Reflection Object

Question

Hi,
I'm in the following situation.
I've a XML file where Java-Class names are defined.
I parse the file and create new instances of the classes,
but I need to cast the Reflection Object to the read-in class,
how can I do this.
        String className = "misc.Test";
        try {
            Class<?> c = Class.forName(className);
            Object o = c.newInstance();
            ((className)o).sayHello();  // <-- That's what I need.
        } catch (Exception e) {
            e.printStackTrace();
...Hope s.o. can help
thx.

Answer 1

Thank's for you answer.
Using an Interface or an abstract class, that's the way I would do it myself, but unfortunately, I don't have access to the classes source code, so I can't make them implement an Interface.
Let's make an example, assume the following mapping in the xml file:
Abstract Type(non Java)          Java Classes
Button                      -->           TextButton
Button1                     -->           ImageButton
-------------------------------------------------------------------Because of the mapping I know what class to use at runtime, but these
classes all provide different methods.
So is there realy no chance to cast the object ?
regards ...