public class ShapeDriver
{
	public static void main(String args[])
	{
		Shape shape1, shape2;
		Circle circle1 = new Circle(4);
		Point point1 = new Point(1,2);
		
		shape1 = circle1;
		shape2 = point1;
		shape1 = shape2;
		circle1 = (Circle) shape2;
	}	
}