What came first, the chicken or the egg? Should I pass a class or an interface? People will fight over these topics until the cows come home. So why don't we just get knee deep into it and put a stake in the ground. For us, let's define an interface type as a specification of a protocol, potentially supported by many object types. Should we use base classes instead of interfaces whenever possible? From a versioning perspective, classes are more flexible than interfaces. With a class, we can ship version 1.0 and then, in version 2.0, add a new method to the class. As long as the method is not abstract, any existing derived classes continue to function unchanged.
Another potential hazard for us is that because interfaces do not support implementation inheritance, the pattern that applies to classes does not apply to interfaces. Adding a method...
