/** @param args the command line arguments */ public static void main(String[] args) { // instantiate a pig. Animal pig = new Pig(); pig.introduce(); pig.performFly(); pig.performNoise(); // instantiate a chicken. Animal chicken = new Chicken(); chicken.introduce(); chicken.performFly(); chicken.performNoise(); // instantiate a cow. Animal cow = new Chicken(); cow.introduce(); cow.performFly(); cow.performNoise(); // instantiate other animals... }