Here you can read about this principle: http://en.wikipedia.org/wiki/Composition_over_inheritance http://en.wikipedia.org/wiki/Composition_over_inheritance Th

Here you can read about this principle: http://en.wikipedia.org/wiki/Composition_over_inheritance http://en.wikipedia.org/wiki/Composition_over_inheritance The take away part in the article is this: "... so there is no way to produce collisions."