/**Demonstrates the basics of polymorphism

 *

 * @author TK Rogers

 * @version 3-9-11

*/

public class PolymorphismDemo {

 

   RedSquare r1 = new RedSquare ( ) ;

// RedSquare r2 = new Square ( ) ; gives compiling error

   Square r2 = new RedSquare ( ) ;

   BlueSquare b = new BlueSquare ( ) ;

// BlueSquare b2 = new RedSquare ( ) ; gives compiling error

   Square s = new Square ( ) ;

   public static void main ( ) {

       // Creating a local demo object makes it possible

       // for a static method like main to access an

       // instance method like outPut.

       PolymorphismDemo demo = new PolymorphismDemo ( ) ;

       demo.outPut ( ) ;

   }

  

   public void outPut ( ) {     

       System.out.print ( "RedSquare   r1 area (ft^2) = " + r1.areaCalculator ( ) ) ;

       System.out.println ( "\t color = " + r1.color ) ;

      

       System.out.print ( "Square      r2 area (ft^2) = " + r2.areaCalculator ( ) ) ;

       System.out.println ( "\t color = " + r2.color ) ;

  

       System.out.print ( "BlueSquare  b  area (in^2) = " + b.areaCalculator ( ) ) ;

       System.out.println ( "\t color = " + b.color ) ;
 

       System.out.print ( "Square      s  area (in^2) = " + s.areaCalculator ( ) ) ;

       System.out.println ( "\t color = " + s.color ) ;

   }

}