static void Main(string[] args)
{
//创建一杯浓缩型咖啡
var beverage = new Espresso();
//显示咖啡信息和价格
Console.WriteLine($"{beverage.Description} $ {beverage.Cost()}");
//创建一杯首选咖啡
Beverage beverage2 = new HouseBlend();
//加份摩卡
beverage2 = new Mocha(beverage2);
//再加份摩卡
beverage2 = new Mocha(beverage2);
//加份奶油
beverage2 = new Whip(beverage2);
//显示咖啡信息和价格
Console.WriteLine($"{beverage2.Description} $ {beverage2.Cost()}");
}
