I would like to know if this is a good idea that conforms to best practices that does not lead to obscenely confusing code or major performance hit(s):

1. Make my own Collision detection class that extends Rectangle class.
2. Then when instantiating that object doing something such as Collision col = new Rectangle(); <- Should I do that or is that something that should be avoided? I am aware that I 'can' but should I?
3. I want to extend Rectangle class because of the contains() and intersects() methods; should I be doing that or should I be doing something else for 2D collision detection in Java?