'Friends' equivalent for Java? [duplicate]

Answer 1

(Un)fortunately, there is no direct C++ friend equivalent in Java. However, the Java access level modifiers can assist you. In particular, private or package private (AKA package protected, or "default") may help.

Answer 2

You might want to use interface segregation - that is, let the class implement different interfaces, and only pass out references to the appropriate (smaller) interfaces to the different clients.