// Fig. 10.3: HierarchyRelationshipTest3.java
// Attempting to invoke subclass-only member methods through
// a superclass reference.

public class HierarchyRelationshipTest3 { 

   public static void main( String[] args ) 
   {
      Point3 point; 
      Circle4 circle = new Circle4( 120, 89, 2.7 ); 
      
      point = circle;  // aim superclass reference at subclass object
	  
      // invoke superclass (Point3) methods on subclass  
      // (Circle4) object through superclass reference
      int x = point.getX();
      int y = point.getY();
      point.setX( 10 );  
      point.setY( 20 );
      point.toString();

      // attempt to invoke subclass-only (Circle4) methods on
      // subclass object through superclass (Point3) reference
      double radius = point.getRadius();
      point.setRadius( 33.33 );
      double diameter = point.getDiameter();
      double circumference = point.getCircumference();
      double area = point.getArea();

   } // end main

} // end class HierarchyRelationshipTest3

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