思维导图如图所示:
1、商品类(父类)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace 超市收银系统
{
class ProductFather
{
public double Price
{
get;
set;
}
public string Name
{
get;
set;
}
public string ID
{
get;
set;
}
//构造函数
public ProductFather(string id,double price,string name)
{
this.ID = id;
this.Price = price;
this.Name = name;
}
}
}
2、子类(Acer笔记本,酱油,香蕉,三星笔记本)
(i)三星笔记本类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace 超市收银系统
{
class SamSung:ProductFather
{
public SamSung(string id, double price, string Name) : base(id, price, Name)
{
}
}
}
(ii)酱油类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace 超市收银系统
{
class JiangYou:ProductFather
{
public JiangYou(string id,double price,string Name):base(id,price,Name)
{
}
}
}
(iii)香蕉类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace 超市收银系统
{
class Banana:ProductFather
{
public Banana(string id, double price, string Name) : base(id, price, Name)
{
}
}
}
(IV)Acer笔记本类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace 超市收银系统
{
class Acer:ProductFather
{
public Acer(string id, double price, string Name) : base(id, price, Name)
{
}
}
}
3、仓库类
这里的List<List<ProductFather>>表示新建了一个仓库内的货架
Guid.NewGuid().ToString()可以获取到一串不重复的序列码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace 超市收银系统
{
class CangKu
{
/*存储货物*/
//这样写较为麻烦
//List<SamSung> listSam = new List<SamSung>();
//List<Acer> listAcer = new List<Acer>();
//List<JiangYou> listJiangYou = new List<JiangYou>();
//List<Banana> listBanana = new List<Banana>();
//一层list表示的是仓库,二层list表示的是仓库里的货架
List<List<ProductFather>> list = new List<List<ProductFather>>();
//list[0]存储Acer电脑
//list[1]存储三星手机
//list[2]存储酱油
//list[3]存储香蕉
/// <summary>
/// 在创建仓库对象的时候,向仓库中添加货架
/// </summary>
public CangKu()
{
list.Add(new List<ProductFather>());
list.Add(new List<ProductFather>());
list.Add(new List<ProductFather>());
list.Add(new List<ProductFather>());
}
/// <summary>
/// 向用户展示货物
/// </summary>
public void ShowPros()
{
foreach (var item in list)
{
Console.WriteLine("我们超市有:" + item[0].Name + "\t" + "有" + item.Count + "个\t" + "每个" + item[0].Price + "元");
}
}
/// <summary>
/// 进货
/// </summary>
/// <param name="strType">货物的类型</param>
/// <param name="count">货物的数量</param>
public void importPros(string strType,int count)
{
for (int i = 0; i < count; i++)
{
switch (strType)
{
case "Acer":list[0].Add(new Acer(Guid.NewGuid().ToString(), 1000, "宏碁笔记本"));
break;
case "SamSung":list[1].Add(new SamSung(Guid.NewGuid().ToString(), 2000, "棒子的手机"));
break;
case "JiangYou":list[2].Add(new JiangYou(Guid.NewGuid().ToString(), 10, "老抽"));
break;
case "Banana":list[3].Add(new Banana(Guid.NewGuid().ToString(), 50, "香蕉"));
break;
}
}
}
/// <summary>
/// 从仓库中提取货物
/// </summary>
/// <param name="strType">货物的种类</param>
/// <param name="count">货物的数量</param>
/// <returns></returns>
public ProductFather[] OutportPros(string strType, int count)
{
ProductFather[] pros = new ProductFather[count];
for (int i = 0; i < pros.Length; i++)
{
switch (strType)
{
case "Acer":
if (list[0].Count != 0)
{
pros[i] = list[0][0];
list[0].RemoveAt(0);
}
break;
case "SamSung":
if (list[1].Count != 0)
{
pros[i] = list[1][0];
list[1].RemoveAt(0);
}
break;
case "JiangYou":
if (list[2].Count != 0)
{
pros[i] = list[2][0];
list[2].RemoveAt(0);
}
break;
case "Banana":
if (list[3].Count != 0)
{
pros[i] = list[3][0];
list[3].RemoveAt(0);
}
break;
}
}
return pros;
}
}
}
4、打折类(抽象父类)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace 超市收银系统
{
/// <summary>
/// 打折的父类
/// </summary>
abstract class CalFather
{
/// <summary>
/// 计算打折后应付多少钱
/// </summary>
/// <param name="realMoney">打折前应付的价钱</param>
/// <returns>打折后应付的钱</returns>
public abstract double GetTotalMoney(double realMoney);
}
}
(i)不打折(继承抽象父类,重写打折后价格)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace 超市收银系统
{
/// <summary>
/// 不打折 该多少钱就多少钱
/// </summary>
class CalNormal:CalFather
{
public override double GetTotalMoney(double realMoney)
{
return realMoney;
}
}
}
(ii)打折(继承抽象父类,重写打折后价格)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace 超市收银系统
{
/// <summary>
/// 按折扣率打折
/// </summary>
class CalRate:CalFather
{
public double Rate
{
get;
set;
}
public CalRate(double rate)
{
this.Rate = rate;
}
public override double GetTotalMoney(double realMoney)
{
return realMoney * this.Rate;
}
}
}
(iii)满M元减N元(继承抽象父类,重写打折后价格)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace 超市收银系统
{
class CalMN:CalFather
{
//买500送100
public double M
{
get;
set;
}
public double N
{
get;
set;
}
public CalMN(double m, double n)
{
this.M = m;
this.N = n;
}
public override double GetTotalMoney(double realMoney)
{
if (realMoney >= this.M)
{
return realMoney - (int)(realMoney / this.M) * this.N; //realMoney/this.M意思为 买M送N,如果买2M则送2N
}
else
{
return realMoney;
}
}
}
}
4、超市收银类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace 超市收银系统
{
class SupperMarket
{
CangKu ck = new CangKu();
/// <summary>
/// 创建超市对象的时候,给仓库的货架上导入货物
/// </summary>
public SupperMarket()
{
ck.importPros("SamSung", 100);
ck.importPros("JiangYou", 50);
ck.importPros("Banana", 10);
ck.importPros("Acer", 6);
}
/// <summary>
/// 跟用户交互的过程
/// </summary>
public void AskBuying()
{
Console.WriteLine("欢迎光临,请问您需要什么?");
Console.WriteLine("我们有 Acer、SamSung、JiangYou、Banana");
string strType = Console.ReadLine();
Console.WriteLine("您需要多少?");
int count = Convert.ToInt32(Console.ReadLine());
//去仓库取货
ProductFather[] pros = ck.OutportPros(strType, count);
//下面该计算价钱了
double realMoney = GetMoney(pros);
Console.WriteLine("您总共应付{0}元", realMoney);
Console.WriteLine("请选择您的打折方式 1——不打折 2——打9折 3——打85折 4——买300送50 5——买500送100");
string input = Console.ReadLine();
//通过简单工厂的设计模式根据用户的输入获得一个打折对象
CalFather cal = GetCal(input);
double totalMoney = cal.GetTotalMoney(realMoney);
Console.WriteLine("打完折后,您应付{0}元", totalMoney);
Console.WriteLine("以下是您的购物信息");
foreach (var item in pros)
{
Console.WriteLine("货物名称:" + item.Name + "," + "\t" + "货物单价:" + item.Price + "," + "\t" + "货物编号:" + item.ID);
}
}
/// <summary>
/// 根据用户的选择打折方式返回一个打折对象
/// </summary>
/// <param name="input">用户的选择</param>
/// <returns>返回的父类对象 但是里面装的是子类对象</returns>
public CalFather GetCal(string input)
{
CalFather cal = null;
switch (input)
{
case "1":
cal = new CalNormal();
break;
case "2":
cal = new CalRate(0.9);
break;
case "3":
cal = new CalRate(0.85);
break;
case "4":
cal = new CalMN(300, 50);
break;
case "5":
cal = new CalMN(500, 100);
break;
}
return cal;
}
/// <summary>
/// 根据用户买的货物计算总价钱
/// </summary>
/// <param name="pros"></param>
/// <returns></returns>
public double GetMoney(ProductFather[] pros)
{
double realMoney = 0;
for (int i = 0; i < pros.Length; i++)
{
realMoney += pros[i].Price;
}
return realMoney;
}
public void ShowPros()
{
ck.ShowPros();
}
}
}
5、主程序运行
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace 超市收银系统
{
class Program
{
static void Main(string[] args)
{
SupperMarket sm = new SupperMarket();
//展示货物
sm.ShowPros();
//跟用户交互
sm.AskBuying();
}
}
}
运行结果
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整个案例非常适合对面向对象学习总结,这种编程方式可拓展性比较强。
目前只支持一次购买一种商品,后续可拓展一次购买多个商品等功能