Restrict Function Calls in Child Class

I have a base class Base, and derived classes from it such as DerivedA, DerivedB etc. And I have task classes derived from android.os.AsyncTask such as TaskA, Task B, TaskC etc.

What I want to accomplish is restricting calls in Task classe开发者_高级运维s to specific Derived classes. Such as

TaskA can call functions from DerivedA, but not from DerivedB,DerivedC etc ...

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Every class can call public methods. You could restrict access by putting your classes in separate packages and use package-private access. See here if you don't know it already.