Why can't you use protected or private in an interface?

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vrazbros2016-09-12 13:43:54

OOP

vrazbros, 2016-09-12 13:43:54

Why can't protected or private be used in an interface? In an abstract class, you can...

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Fat Lorrie, 2016-09-12
@Free_ze

The interface is intended for declaring an external API without specifying the implementation. It should only have public members.
Generally speaking, this is an artificial limitation adopted for convenience. In the same C++, purely virtual (abstract) stateless classes are used as interfaces. The presence of a special syntactic construction (interfaces, as in C# or Java) makes it possible to clearly emphasize that there is no surprise for the programmer and this type is used as a "glue" between other classes.

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res2001, 2016-09-12
@res2001

You can also use protected, then it will also be an interface for child classes.