About hiding classes

Answer 1

Hello.

Could you please write your question?
I suppose you mean encapsulation in OOP so I will answer that one...
This is data hiding and very useful in OOP (Java, C#, C++, etc.) to secure your data from 3rd person interfering and also to create a blueprint for future objects without rewriting dozens of lines in IDE.

Hope it helps.

Answer 2

explain about hiding classes in packages