Main2.java

public class Main2 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Rectangle r = new Rectangle(40,10);
        GetArea(r);

        Square s = new Square(50);
        GetArea(s);

        Drawable d = new Rectangle(10,10);

        Draw(r);
        Draw(s);
        Draw(d);
    }

    public static void Draw(Drawable shape) {
        shape.Draw();
    }

    public static void GetArea(Rectangle r) {
        r.getArea();
    }
}