Hiding classes in a jar file

Question

Is it really impossible to hide some classes in a jar file?

I wanted not to allow direct instantiation of the classes to keep it more flexible. Only the factory (or

Answer 1

I'm understanding you're not looking to hide the actual classes, just prevent their construction outside a factory class. This I think can be quite easily achieved by using package private (default) visibility in the class constructors. The only limitation is that you'll need to have the classes and the factory in the same package so in a medium to large codebase things may get unnecessarily complex.