Problems with Reflection API and intantiating an class from a string value

Question

I want to instantiate a class with the name from a String. I have used the reflection api so:
static Object createObject(String className) {
Object object = null;
try {
Class classDefinition = Class.forName(className);
object = classDefinition.newInstance();
} catch (InstantiationException e) {
System.out.println(e);
} catch (IllegalAccessException e) {
System.out.println(e);
} catch (ClassNotFoundException e) {
System.out.println(e);
return object;
Let's say my class name is "Frame1".
and then if i use:
Frame1 frm = (Frame1) createObject("Frame1");
everything is ok but i cannot do this because the name "Frame1" is a String variable called "name" and it doesn't work like:
name frm = (name) createObject("Frame1");
where i'm i mistaking?
Thanks very much!

Answer 1

i have understood what you have told me but here is a little problem
here is how my test code looks like
Class[] parameterTypes = new Class[] {String.class};
Object frm = createObject("Frame1");
Class cls = frm.getClass();
cls.getMethod("pack",parameterTypes);
cls.getMethod("validate",parameterTypes);
everything works ok till now.
usually if i would of had instantiated the "Frame1" class standardly the "cls" (or "frm" in the first question ) object would be an java.awt.Window object so now i can't use the function (proprietary):
frame_pos_size.frame_pos_size(frm,true);
this function requires as parameters: frame_pos_size(java.awt.Window, boolean)
because my cls or frm objects are not java.awt.Window i really don't find any solution for my problem. I hope you have understood my problem. Please help. Thanks a lot in advance.