开放关闭原则支持

/*
* For each new shape added the unit testing
* of the GraphicEditor should not be redone
* No need to understand the sourcecode
* from GraphicEditor.
* Since the drawing code is moved to the
* concrete shape classes, it's a reduced risk
* to affect old functionallity when new
* functionallity is added.
*/ 
class GraphicEditor {
     public void drawShape(Shape s) {
         s.draw();
     }
 }

 class Shape {
     abstract void draw();
 }

 class Rectangle extends Shape  {
     public void draw() {
         // draw the rectangle
     }
 }