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A common class (which is not subclass) and has no inheritance, can use an attribute protected of a superclass that has a subclass? If so, this attribute will be visible (no need to use the superclass’s get and set methods)?
3 answers
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No. One cannot speak of inheritance when the premise is that there will be no inheritance. So the question even makes sense.
If there was inheritance in the field (I do not consider it correct to call it an attribute, notice in the question how confusing it is to have two things using the term attribute) it will be visible in this class that has inherited another and has a field with attribute protected in your statement. It will not be visible elsewhere.
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There are two things we can observe in your doubt:
- You want to access a field
protectedof a class. That’s a bad Smell that you’re using this class for a different purpose for which it was created. A class, in the perfect setting, must have only one purpose and responsibility (the famous Single Responsibility), so your strategy may not be the best. - A class with a field
protectednot being a superclass of any other, it is also a bad Smell indicating that this class was poorly planned in its creation. Otherwise this field would probably beprivate. Validate the context of this class and its use in the system to see if this is the case. If it is, a refactoring is valid, to use it the way you have in mind.
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You can circumvent all this, heritage and access level, with Reflection. Then you access properties and fields private, protected, whatever it is. It’s hardly the best way to solve your problem, but it works.
If you give more details I can provide an example of code.
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If you are not subclass and have no inheritance, which is the superclass ?
– Isac
Possible duplicate of What is the difference between public, default, protected and private modifiers?
– hkotsubo
Every class, after all, is a subclass of
Object, so - being pretty boring - technically there’s always some heritage involved. Anyway, see if the link above (the possible duplicate) already has the information you need. If not, please feel free to [Dit] your question, explaining why the other question did not resolve your question.– hkotsubo
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– Maniero