Java applet calling another applet on the Javacard

Hi, I am new to JC.
I have some Java classes which I do not want others to extend. Hence, to hide these classes, I have created a set of helper classes that will provide services to these "hidden" Java classes to other calling applets, much like the way I do in J2SE. Something like a wrapper class.
The problem is, I am not sure if other applet classes can call this new helper class or not? and I am also not sure how this can be done. Can someone advise? Thanks in advance.

I'm not sure what this has to do with JavaCards.
Sounds like a simple Facade Design Pattern. Also your classes are "hidden" when you make them package protected or package private. Read J2SE packages and you'll see what I mean.
If you are referring to JavaCard, by design each package is it's own context therefore, there's a context firewall to protect it's objects and data. A shareable Interface object must be implemented to allow access.

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