FAQ: Classes and Objects - Access Control: Public and Private

This community-built FAQ covers the “Access Control: Public and Private” exercise from the lesson “Classes and Objects”.

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FAQs on the exercise Access Control: Public and Private

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I don’t understand the essence of access modifiers such as public or private in classes if for example everything in a class is private , meaning class members are limited to the scope of the class.
What is the point if object instances have no access to its class members ?
Please correct me if I am misunderstanding this concept or at least clarification. Thank you.