Tag Archives: class diagram

Why Implements is ‘Evil’

I stumbled across this really old article titled ‘Why Extends Is Evil’ by Allen Holub. A solid bunch of OO practitioners out there seem to think along the lines of what this article is stating, namely, that using ‘extends’ is … Continue reading


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UML Tip : Showing Multiplicity in a Class

Sometimes UML diagrams get too big. You want to show all the important relationships, but everything is starting to look like a big mess. In UML it is possible to represent multiplicity in a class. Say I have a Patient, … Continue reading


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