creating instance of a class from another directory

[Pouncer]

Say for e.g.

My java application lies in C:\myProject

I have
D:\stuff\TestPlayer.java
D:\stuff\ComputerPlayerInterface.java

now from my application dir, how could i load an instance of TestPlayer?

	    Class c = Class.forName("TestPlayer");

	    ComputerPlayerInterface o = (ComputerPlayerInterface) c.newInstance();

but the above code means that TestPlayer has to be in C:\myProject but i want to get this working to create an instance of TestPlayer with it being in a different folder

Class c = Class.forName("D:\stuff\TestPlayer") does not work.

any ideas guys, is this even possible, without editing TestPlayer.java or ComputerPlayerInterface.java?