Coba jelasin way on the clients. dari Class (élmu komputer) dalam bahasa sunda dong

The methods that are not in any of the interfaces of a class are private to the class, and not intended to be depended on by other classes.

The "set of all interfaces of a class" is sometimes called the interface of the class.

The internal data structures defined as part of a class are not considered to be part of its interface. Rather, public accessor methods can be used to inspect or alter object data. The various object-oriented programming languages enforce this to various degrees. For example, Java does not allow the programmer to access the private data of a class at all, wheréas in languages like Objective-C or Perl the programmer can do what they want. In C++, private methods are visible but not accessible in the interface; however they are commonly made invisible by explicitly declaring fully abstract classes that represent the interfaces of the class.