static void Main(string[] args)
{
// Mallard Duck Example
Console.WriteLine("Running the mallard duck example...");
Duck mallard = new MallardDuck();
mallard.PerformQuack();
mallard.PerformFly();
Console.WriteLine();
// Model duck example that changes the duck's fly behavior at runtime
// by calling its setter method for the fly behavior.
Console.WriteLine("Running the model duck example...");
Duck model = new ModelDuck();
model.PerformQuack();
// This first call to PerformFly() delegates to the flyBehavior object
// set in the ModelDuck's constructor, which is a FlyNoWay instance.
model.PerformFly();
// To change a duck's behavior at runtime, just call the duck's setter
// method for that behavior (see next example).
// This invokes the model's inherited behavior setter method, and voila!
// The model suddenly has rocket-powered flying capability!
model.SetFlyBehavior(new FlyRocketPowered());
// If it worked, the model duck dynamically changes its flying behavior!
// You can't do that if the implementation lives inside the duck class.
model.PerformFly();
Console.ReadLine();
}
static void Main(string[] args)
{
Duck mallard = new ModelDuck();
mallard.PerformQuack();
mallard.PerformFly();
mallard.SetFlyBehavior(new FlyRocketPowered());
mallard.PerformFly();
}