如何在类图中使用聚合关系？

Question

I have some strange question.

I have a class that composed of 2 classes.

But the main class has not any methods or attributes. only the aggregate classes.

I want to access the 2 other classes using the main class without creating objects directly from them in the main program

Creating objects from the 2 classes is permitted only to the main class and not allowed to the other 2 classes

How to do that?

Answer 1

It seems to me that you want to use nested classes. You just need to declare the classes as private and you're good to go. https://docs.oracle.com/javase/tutorial/java/javaOO/nested.html