Load a class based on the value of a string

Question

I have a string coming in into a servlet.
I want to instaniate a class that is the same name
as the string.
A class exists for every possible value of the string.
this is what my vision is.
public ActionForward execute(
     ActionMapping mapping,
     ActionForm form,
     HttpServletRequest request,
     HttpServletResponse response)
     throws Exception {
     SubmitForm frm = (SubmitList)form;
     String classname = (String)request.getAttribute("listToEdit");
     //this is where the help is needed.
        //create an instance of the correct object.
        //pass it the form
        //class that objects execute method
     obj o = loadclass(classname);
        obj.setForm(frm);
        obj.execute();

Answer 1

thanks steve , class.Forname is what i was looking for.
I realized i need to cast it to the appropriate object and i was looking into that. You just solved it with the interface example.
One more question.
does my class have to implement the interface i create.
public class TelephonNumbers implements ListEditInterface {
       private ActionForm form;
       public void setForm(ActionForm form) {
       this.form = form;}      
       public void execute(HttpServletRequest r) {
              //get session bean
              //update appropriate list in bean
              //put the bean back into the request/session
              //pass control back to action class.
}