Make java methods visible to only specific classes

Question

I have a manager class that is responsible for managing Objects of a certain kind. To do so it needs to manipulate these Objects, but these Objects have no relation to the m

Answer 1

Why not have an interface called

ManagerFunctions

and another called

ClientFunctions

You managed objects will implement both of these.

When you create the managed objects, you pass them around, but only as references to ClientFunctions. The manager objects will, however, refer to them as ManagerFunctions and consequently have access to their 'managed' functions. The appropriate casting will simply expose the appropriate methods.

Your IDE will automatically present you wil the appropriate methods depending on how these objects are referenced.