public class Demo5b
{
   public static void main(String[] args)
   {
	GeometricObject a = new Rectangle("red", 1, 2); // Upcasting

	System.out.println(a.getArea());   // Polymorphism !

	// *************************************************************
	// What happens when you cast a superclass to a WRONG subclass
	// *************************************************************
	Circle b;

	b = (Circle) a;	  // Cast superclass (GeometricObject a) to subclass
			  // NO compile error: it is allowed
			  // BUT you will get a RUNTIME error 
	System.out.println(b.getRadius());  
   }
}