// Fig. 10.1: HierarchyRelationshipTest1.java
// Assigning superclass and subclass references to superclass- and
// subclass-type variables.
import javax.swing.JOptionPane;

public class HierarchyRelationshipTest1 { 

   public static void main( String[] args ) 
   {
      // assign superclass reference to superclass-type variable
      Point3 point = new Point3( 30, 50 );                      

      // assign subclass reference to subclass-type variable
      Circle4 circle = new Circle4( 120, 89, 2.7 );         

      // invoke toString on superclass object using superclass variable
      String output = "Call Point3's toString with superclass" +
         " reference to superclass object: \n" + point.toString();

      // invoke toString on subclass object using subclass variable      
      output += "\n\nCall Circle4's toString with subclass" +
         " reference to subclass object: \n" + circle.toString();

      // invoke toString on subclass object using superclass variable
      Point3 pointRef = circle; 
      output += "\n\nCall Circle4's toString with superclass" +
         " reference to subclass object: \n" + pointRef.toString();

      JOptionPane.showMessageDialog( null, output );  // display output

      System.exit( 0 );

   } // end main

} // end class HierarchyRelationshipTest1

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