relationship betwwen interface and abstract classes

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Can an abstract class inherits from an interface class ?I have 8 classes in my programme.Taxi,Subway and Buss inherit from abstract public transportation.and also Taxi and Buss inherit from vehicle which is an interface class.mid-buss and large-buss inherit from buss and limo inherits from Taxi.i need to say buss and taxi are also abstract classes.now we have an abstract class which inherits from interface so i have to implement the methods in the Taxi and Buss classes. is it correct to design something like above or not ?

Posted 25-Aug-15 0:24am

seyed mahmud shahrokni

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OriginalGriff · Accepted Answer · 2015-08-25T00:59:00

First off, an interface isn't a class - it can't contain any implementation at all.
An interface is a contract - "You agree to do this, and I'll let you in the club". This is nothing like a class, which says "I provide this, you can build upon it".

Can an abstract class include an interface in it's declaration? Yes.
But it has to include the interface properties and methods in the abstract class definition, or mark them as abstract - it can't just "leave them" to the concrete class to complete.