系统功能列表：

1、会员注册：输入会员名，会员名应该唯一

2、会员列表: 显示所有会员信息

3、删除会员: 根据输入的用户名进行删除



4、添加商品：输入商品名、价格、描述

5、商品列表: 显示所有的商品信息

6、删除商品: 根据商品名删除单个商品



7、下单(购买)：输入用户名、商品名、数量进行下单操作

8、订单列表: 显示所有订单(包括用户名、商品名、下单数量等信息)



系统设计阶段：

1 先找名词:(Domain Model)(实体):

会员-->User,商品-->Product,订单-->Order

2 业务逻辑实现部分-List of system functions: 1 Register: input member name, member name should only member list: Displays all Member information, delete Member: enter the user name delete, add commodities: Enter a product name, price, descr iption Product List: display all product information, delete commodities: delete a single commodity orders (purchase): Enter the user name, trade name, trade name, the number of single operation 8, the list of orders: all orders ( including user name, trade name, order number, and other information) system design stage: 1 to go first to a noun: (Domain Model) (entity): Member->　User, commodities->　Product, Order->　Order 2 business logic implementation section