Make Point,Polygon,Polyline not final classes

[mraad]

This will enable us to extent the class for another frameworks

[snodnipper]

Perhaps you'd like to wrap these geometries.

For example:

public class MyPoint {
     private Point mEsriPoint;
     public double getX() { {
         return mEsriPoint.getX();
    }
}

That is similar to how we'd work with, say, String, Float, Double classes rather than extending them. You can read more about 'favoring composition over inheritance' in Effective Java, p.81.