static void Main(string[] args)
{
try {
var ostrish = new Ostrich();
var parrot = new Parrot();
var penguin = new Penguin();
var rubberBird = new RubberBird();
ostrish.Display();
ostrish.Fly();
Console.WriteLine("After modifying the flying behavior.");
ostrish.FlyBehaviour = new FlyBehaviour();
ostrish.Fly();
ostrish.Speak();
ostrish.Swim();
Console.WriteLine("\n");
parrot.Display();
parrot.Fly();
parrot.Speak();
parrot.Swim();
Console.WriteLine("\n");
penguin.Display();
penguin.Fly();
penguin.Speak();
penguin.Swim();
Console.WriteLine("\n");
rubberBird.Display();
rubberBird.Fly();
rubberBird.Speak();
rubberBird.Swim();
} catch (Exception ex) {
Console.WriteLine("Error : " + ex.Message.ToString());
}
Console.ReadKey();
}