Interface is more popular and used in single-inheritance class model languages.
There object's interface is used by making instances of objects.
The languages which supports multi-inheritance class model, there classes &
different methods are used instead of Interface.
But, I prefer Interface mechanism over multi-inheritance class.
A little difference between Interface & Class (for C#) are as\
- Class - procedures/ methods (with
definition) +.. ex. Data members
- Interface - have methods without
definitions
- Class - doesn't support multiple
inheritances.
- Interface - are used to get the
functionality of class multi-inheritance by implementing interfaces ( refer
- different instances)