static void Main(string[] args)
{
Duck normalDuck = new NormalDuck();
Console.WriteLine("Hi! I'm a normal duck. I can quack and fly. Look:");
normalDuck.Quack();
normalDuck.Fly();
Console.WriteLine();
Duck phoenixDuck = new PhoenixDuck();
Console.WriteLine("And I'm a glorious phoenix duck! I'm designed for battles. Look what I can do:");
phoenixDuck.Fly();
phoenixDuck.Quack();
Console.WriteLine();
phoenixDuck.SetFlyBehaviour(new FlyWithWings());
phoenixDuck.SetQuackBehaviour(new NormalQuack());
Console.WriteLine("Oh no! The phoenix duck was demoted to a normal duck! Look how its flying and quacking methods were changed:");
phoenixDuck.Fly();
phoenixDuck.Quack();
Console.ReadLine();
}
static void Main(string[] args)
{
//设计模式: 策略模式
//思想: 定义一系列算法,把他们一个个封装起来,并且使他们可以互相替换(变化)
//优点: 该模式可以使算法独立于使用它的客户端程序(稳定)而变化(扩展,子类化)
//当看到if else,并且if else会改变(扩展)的时候, 通常需要用到策略模式
//一只普通的鸭子和一只超级鸭子
Duck nDuck = new NormalDuck();
Duck sDuck = new SuperDuck();
Console.Write($"普通鸭子叫:");
nDuck.Quack();
Console.Write($"普通鸭子飞:");
nDuck.Fly();
Console.WriteLine();
Console.Write($"超级鸭子叫:");
sDuck.Quack();
Console.Write($"超级鸭子飞:");
sDuck.Fly();
Console.ReadLine();
}