public static void Main(string[] args)
{
RubberDuck rduck = new RubberDuck();
rduck.PerformFly();
rduck.PerfromQuack();
Console.WriteLine("Adding RocketFly behavior to the rubber duck");
rduck.flyBehaviorObj = new RocketFlyBehavior();
rduck.PerformFly();
Console.ReadLine();
}