public class FarmWorkers {
   public static void main ( String args[] ) {

       // Create objects for farmers ....

       Working mac = new Farmer( "Old MacDonald" );
       System.out.println( mac.toString() ); 
       mac.hours();

       // Create objects for working farm animals ..

       Working max = new WorkingDog( "Max" );
       System.out.println( max.toString() ); 
       max.hours();

       Working silver = new WorkingHorse( "Silver" );
       System.out.println( silver.toString() ); 
       silver.hours();

   }
}