饮料的包装
using System;
using System.Collections.Generic;using System.Linq;using System.Text;namespace Decorator
{ //抽象组件类 饮料 public abstract class Beverage { public string description = "未知描述"; public Size size; public abstract Size getsize(); public abstract string getDescription(); public abstract double cost(); } //咖啡类 public class Coffe : Beverage { public override Size getsize() { return size; }public Coffe(Size s)
{size = s;
if (this.getsize() == Size.Big) { description = "大Coffe"; } if (this.getsize() == Size.Mid) { description = "中Coffe"; } if (this.getsize() == Size.Small) { description = "小Coffe"; } }public override string getDescription()
{ return this.description; } public override double cost() { double d = 0; if (this.getsize() == Size.Big) { d = 4.5; } if (this.getsize() == Size.Mid) { d = 3.5; } if (this.getsize() == Size.Small) { d = 2.5; } return d; } }//茶类
public class Tea : Beverage { public override Size getsize() { return size; }public Tea(Size s)
{ size = s; if (this.getsize() == Size.Big) { description = "大Tea"; } if (this.getsize() == Size.Mid) { description = "中Tea"; } if (this.getsize() == Size.Small) { description = "小Tea"; } }public override string getDescription()
{ return this.description; }public override double cost()
{ return 10; } }//容器大小
public enum Size { Big,Small,Mid }//装饰者类 Decorator,其实也是继承饮料类,可用它也可不用
public abstract class Decorator : Beverage { //public abstract new string getDescription(); }//材料：摩卡
public class Mocha : Beverage { Beverage bc;public override Size getsize()
{ return bc.size; }public Mocha(Beverage b)
{ bc = b; }public override string getDescription()
{ return bc.getDescription() + "[+摩卡]"; }public override double cost()
{ double d=bc.cost(); if (bc.getsize() == Size.Big) { d += 0.3; } if (bc.getsize() == Size.Mid) { d += 0.2; } if (bc.getsize() == Size.Small) { d += 0.1; } return d; } }//材料：牛奶
public class Milk : Beverage { Beverage bc;public override Size getsize()
{ return bc.size; }public Milk(Beverage b)
{ bc = b; }public override string getDescription()
{ return bc.getDescription() + "[+牛奶]"; }public override double cost()
{ double d = bc.cost(); if (bc.getsize() == Size.Big) { d += 0.32; } if (bc.getsize() == Size.Mid) { d += 0.22; } if (bc.getsize() == Size.Small) { d += 0.12; } return d; } }//材料：豆奶
public class Soy : Beverage { Beverage bc;public override Size getsize()
{ return bc.size; }public Soy(Beverage b)
{ bc = b; }public override string getDescription()
{ return bc.getDescription() + "[+豆奶]"; }public override double cost()
{ double d = bc.cost(); if (bc.getsize() == Size.Big) { d += 0.31; } if (bc.getsize() == Size.Mid) { d += 0.21; } if (bc.getsize() == Size.Small) { d += 0.11; } return d; } } }
using System;
using System.Collections.Generic;using System.Linq;using System.Text;namespace Decorator
{ class Program { static void Main(string[] args) { //来一小杯茶 Beverage be = new Tea(Size.Small);System.Console.WriteLine("饮料：" + be.getDescription() + ",价格：￥" + be.cost().ToString() + "人民币");
//添加牛奶
be = new Milk(be); System.Console.WriteLine(be.GetType().ToString()); //添加摩卡 be = new Mocha(be); System.Console.WriteLine(be.GetType().ToString()); System.Console.WriteLine("最后结账：" + be.getDescription() + ",价格：￥" + be.cost().ToString() + "人民币"); //来一大杯咖啡 Beverage Cof = new Coffe(Size.Mid);System.Console.WriteLine("饮料：" + Cof.getDescription() + ",价格：￥" + Cof.cost().ToString() + "人民币");
//添加豆奶
Cof = new Soy(Cof); System.Console.WriteLine(Cof.GetType().ToString()); //添加两次摩卡 Cof = new Mocha(Cof); Cof = new Mocha(Cof); System.Console.WriteLine(Cof.GetType().ToString()); System.Console.WriteLine("最后结账：" + Cof.getDescription() + ",价格：￥" + Cof.cost().ToString() + "人民币"); System.Console.ReadLine(); } }}