Is inheritnace the only option

[QueenSvetlana]

As you see there is no problem to access data attribute directly,no need for getters/setters.
So can have in information doc that International need to apply doc.
Can also make a check that International most apply doc.

Thanks for the help

I wanted it to be an abstract class, because international Students will need documents(passports, drivers license, etc), Domestic students don't require any.

Did I implement the abstract class correctly?