Скачать или смотреть What is the difference between public, private, and protected in Java?

Public --
Visibility : Anything marked as public can be accessed from anywhere in your program. This means that other classes, even those in different packages, can see and use it.
Use Case : You use public when you want your code to be accessible to everyone. For example, a method that anyone should be able to call.

private --
Visibility : Anything marked as private can only be accessed within the same class. Other classes, even in the same package, cannot see or use it.
Use Case : You use private when you want to hide the details of your code and only allow access through specific methods (like getters or setters).

protected --
Visibility : Anything marked as protected can be accessed by :
1. The same class,
2. Classes in the same package,
3. And subclasses (even if they are in different packages).
Use Case : You use protected when you want to allow access to subclasses but still keep some control over who can see or use your code.


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