Java外卖点餐初级系统（附源码）-轻识

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来源：blog.csdn.net/weixin_44219955

傻瓜式外卖点餐系统（无数据库）

tips：

菜品类(菜品id，菜品名，菜品类型，上架时间，单价，月销售，总数量)
管理员类(管理员id，账号，密码)
客户类(客户id，客户名，性别，密码，送餐地址，手机号，创建时间)
订单类(订单号，订单创建时间，菜品id，购买数，客户id，总价格，订单状态)
说明：

菜品类型可自行设计数据类型(int或String)，如1：面食 2：米饭 3：湘菜 …
菜品上架时间、客户创建时间、订单创建时间根据添加时间自动分配系统时间
订单状态类型为int（0:未支付 1：已支付 2：配送中 3：已完成）
要求实现如下功能：
实现不同角色用户登录系统
(1) 管理员登录系统看到如下菜单：
① 添加菜品
② 查看所有菜品信息(包含分页功能)
③ 查看指定类别的菜品信息
④ 根据菜品id修改菜品价格
⑤ 删除指定id的菜品
⑥ 添加客户
⑦ 查看客户列表
⑧ 删除指定id的客户
⑨ 订单列表显示
⑩ 根据订单id修改订单状态
11 退出
(2) 客户登录看到如下菜单：
① 显示所有菜品(按菜品销量从高到低排序输出)
-------->点餐（输入菜品id和购买数量）
② 根据菜品类别显示所有菜品
③ 查看所有订单(当前登录用户的)
④ 修改密码（当前登录用户的）
⑤ 个人信息显示

以上就是全部要求，首先咱们可以先建一个接口，方便对四个管理类进行操作；

package com.softeem.lesson23.test2;
import java.util.List;
public interface DAO<T> {  void insert(T t);  T findById(String id);  List findAll();  void delete(String id);}

一、再根据要求，先把四个类的属性类建立起来：

1. Admin类（管理员类）

package com.softeem.lesson23.test2;
public class Admin {  private String aID;  private String account;  private String apwd;  public Admin() {    // TODO Auto-generated constructor stub  }  public Admin(String aID, String account, String apwd) {    super();    this.aID = aID;    this.account = account;    this.apwd = apwd;  }  public String getaID() {    return aID;  }  public void setaID(String aID) {    this.aID = aID;  }  public String getAccount() {    return account;  }  public void setAccount(String account) {    this.account = account;  }  public String getApwd() {    return apwd;  }  public void setApwd(String apwd) {    this.apwd = apwd;  }  @Override  public String toString() {    return "Admin [aID=" + aID + ", account=" + account + ", apwd=" + apwd + "]";  }  }

2. Dishes类（菜品类）

package com.softeem.lesson23.test2;
import java.time.LocalDate;
public class Dishes {  private String dID;  private String dname;  private String dtype;  private LocalDate dtime;  private double price;  private int dsales;  private int dstocks;
  public Dishes() {    // TODO Auto-generated constructor stub  }
  public Dishes(String dID, String dname, String dtype, LocalDate dtime, double price, int dsales, int dstocks) {    super();    this.dID = dID;    this.dname = dname;    this.dtype = dtype;    this.dtime = dtime;    this.price = price;    this.dsales = dsales;    this.dstocks = dstocks;  }
  public String getdID() {    return dID;  }
  public void setdID(String dID) {    this.dID = dID;  }
  public String getDname() {    return dname;  }
  public void setDname(String dname) {    this.dname = dname;  }
  public String getDtype() {    return dtype;  }
  public void setDtype(String dtype) {    this.dtype = dtype;  }
  public LocalDate getDtime() {    return dtime;  }
  public void setDtime(LocalDate dtime) {    this.dtime = dtime;  }
  public double getPrice() {    return price;  }
  public void setPrice(double price) {    this.price = price;  }
  public int getDsales() {    return dsales;  }
  public void setDsales(int dsales) {    this.dsales = dsales;  }
  public int getDstocks() {    return dstocks;  }
  public void setDstocks(int dstocks) {    this.dstocks = dstocks;  }
  @Override  public String toString() {    return "Dishes [菜品id：" + dID + ", 菜品名：" + dname + ", 菜品类型：" + dtype + ", 上架时间：" + dtime + ", 单价：" + price        + ", 月销量：" + dsales + ", 总数量：" + dstocks + "]";  }
}

3. Order类（订单类）

package com.softeem.lesson23.test2;
import java.time.LocalDateTime;
public class Order {  private String OrderID;  private LocalDateTime utime;  private Dishes dishes;  private int Ordernum;  private String uID;  private Double Orderprice;  private int OrderValue;
  public Order() {    // TODO Auto-generated constructor stub  }
  public Order(String orderID, LocalDateTime utime, Dishes dishes, int ordernum, String uID, Double orderprice,      int orderValue) {    super();    OrderID = orderID;    this.utime = utime;    this.dishes = dishes;    Ordernum = ordernum;    this.uID = uID;    Orderprice = orderprice;    OrderValue = orderValue;  }
  public String getOrderID() {    return OrderID;  }
  public void setOrderID(String orderID) {    OrderID = orderID;  }
  public LocalDateTime getUtime() {    return utime;  }
  public void setUtime(LocalDateTime utime) {    this.utime = utime;  }
  public Double getOrderprice() {    return Orderprice;  }
  public void setOrderprice(Double orderprice) {    Orderprice = orderprice;  }
  public Dishes getDishes() {    return dishes;  }
  public void setDishes(Dishes dishes) {    this.dishes = dishes;  }
  public int getOrdernum() {    return Ordernum;  }
  public void setOrdernum(int ordernum) {    Ordernum = ordernum;  }
  public String getuID() {    return uID;  }
  public void setuID(String uID) {    this.uID = uID;  }
  public int getOrderValue() {    return OrderValue;  }
  public void setOrderValue(int orderValue) {    OrderValue = orderValue;  }
  @Override  public String toString() {    return "Order [OrderID=" + OrderID + ", utime=" + utime + ", dishes=" + dishes + ", Ordernum=" + Ordernum        + ", uID=" + uID + ", Orderprice=" + Orderprice + ", OrderValue=" + OrderValue + "]";  }
}

4. User类（用户类）

package com.softeem.lesson23.test2;
import java.time.LocalDateTime;
public class User {  private String uID;  private String uname;  private String usex;  private String upwd;  private String uadress;  private String utel;  private LocalDateTime utime;
  public User() {    // TODO Auto-generated constructor stub  }
  public User(String uID, String uname, String usex, String upwd, String uadress, String utel, LocalDateTime utime) {    super();    this.uID = uID;    this.uname = uname;    this.usex = usex;    this.upwd = upwd;    this.uadress = uadress;    this.utel = utel;    this.utime = utime;  }
  public String getuID() {    return uID;  }
  public void setuID(String uID) {    this.uID = uID;  }
  public String getUname() {    return uname;  }
  public void setUname(String uname) {    this.uname = uname;  }
  public String getUsex() {    return usex;  }
  public void setUsex(String usex) {    this.usex = usex;  }
  public String getUpwd() {    return upwd;  }
  public void setUpwd(String upwd) {    this.upwd = upwd;  }
  public String getUadress() {    return uadress;  }
  public void setUadress(String uadress) {    this.uadress = uadress;  }
  public String getUtel() {    return utel;  }
  public void setUtel(String utel) {    this.utel = utel;  }
  public LocalDateTime getUtime() {    return utime;  }
  public void setUtime(LocalDateTime utime) {    this.utime = utime;  }
  @Override  public String toString() {    return "User [uID=" + uID + ", uname=" + uname + ", usex=" + usex + ", upwd=" + upwd + ", uadress=" + uadress        + ", utel=" + utel + ", utime=" + utime + "]";  }
}

这一步没什么难度，直接把每一个属性都设置一下，然后设置为私有，注意属性的数据类型，这个很重要，方便后期管理类对其进行操作。

二、属性管理类

这个是整个demo比较难得地方，我的想法是建立Admin属性管理类，Order属性管理类，Dishes属性类，User属性管理类，再在Admin属性管理类里把Order属性管理类，Dishes属性类，User属性管理类先new出来，然后，每个属性管理类实现各自的方法，只需要在Admin属性管理类中调用各个属性管理类的方法，就可以实现通过Admin类管理其他类的数据，但是，每个类需要建一个Map集合，存储各自的元素，此处应该注意每个属性管理类Map的键方便后期对Map进行操作，然后建立菜单类，规定User和Admin能调用的方法。

话不多说，直接上代码，一下代码是通过Admin管理类延伸的，所以先看Admin管理类。

1. Admin管理类

package com.softeem.lesson23.test2;
import java.time.LocalDate;import java.time.LocalDateTime;//import java.util.ArrayList;import java.util.Collections;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Scanner;//import java.util.Set;
public class AdminSys implements DAO {  static Map map = new HashMap<>();//  static Set keys = map.keySet();  UserSys u = new UserSys();  OrderSys o = new OrderSys();  DishesSys d = new DishesSys();  Scanner sc = new Scanner(System.in);
  /**   * 添加菜品   */  public void addDishes() {    System.out.println("请输入您要添加的菜品:(按照:菜品ID/菜品名/菜品类型/单价/月销量/总数量)");    String str = sc.next();    String[] info = str.split("/");    //    if (info.length < 6) {      System.out.println("天啦撸，输入失败啦，请重新输入！");      addDishes();    } else {      LocalDate dtime = LocalDate.now();      Dishes t = new Dishes(info[0], info[1], info[2], dtime, Double.parseDouble(info[3]),          Integer.parseInt(info[4]), Integer.parseInt(info[5]));      d.insert(t);      System.out.println("小主,恭喜你！添加成功了");    }  }
  /**   * 查看所有菜品信息(包含分页功能)   */  public void showAllDishes(int pageSize) {    List list = d.findAll();    int start = 0;    //先写一个死循环，进入else后break掉    while (true) {      if (list.size() > (pageSize + start)) {        System.out.println(list.subList(start, pageSize + start));
      } else {        System.out.println(list.subList(start, list.size()));        break;      }      start = start + pageSize;    }  }
  /**   * 查看指定类别的菜品信息   *    */  public void selecBytypeOfAdmin() {    System.out.println("请输入您要查询菜品的类别：");    String typename = sc.next();    d.selectBytype(typename);  }
  /**   * 根据菜品id修改菜品价格   */  public void selectByDishesID() {    System.out.println("请输入您要查询的菜品id：");    String id = sc.next();    Dishes dish = d.findById(id);    if (dish == null) {      System.out.println("没有当前id的菜品呢");    } else {      System.out.println("当前菜品为：" + dish);      System.out.println("请输入新的菜品单价：");      double newprice = sc.nextDouble();      Dishes t = new Dishes(dish.getdID(), dish.getDname(), dish.getDtype(), dish.getDtime(), newprice,          dish.getDsales(), dish.getDstocks());      d.insert(t);      System.out.println("修改成功" + d.findById(t.getdID()));    }  }
  /**   * 删除指定id的菜品   *    * @param args   */  public void deleteDishes() {    System.out.println("请输入您要删除的菜品id");    String id = sc.next();    d.delete(id);    System.out.println("删除成功！！");  }
  /**   * 添加客户   */  public void addUser() {    System.out.println("请输入您要添加的用户:按照(id/姓名/性别/密码/送餐地址/手机号)");    String str = sc.next();    String[] info = str.split("/");    if (info.length < 6) {      System.out.println("您输入的信息有误，请重新输入....");      addUser();    } else {      LocalDateTime utime = LocalDateTime.now();      u.insert(new User(info[0], info[1], info[2], info[3], info[4], info[5], utime));      System.out.println("添加成功");    }  }
  /**   * 查看客户列表   */  public void findUser() {    List userlist = u.findAll();    for (User user : userlist) {      System.out.println(user);    }  }
  /**   * 根据id查找指定用户   */  public User findUserByid(String id) {    return u.findById(id);  }
  /**   * 删除指定id的客户   */  public void deleteUserByAdmin() {    System.out.println("请输入您要删除的id：");    String id = sc.next();    u.delete(id);  }
  /**   * 订单列表显示   */  public void showAllOrder() {    List allOrder = o.findAll();    for (Order order : allOrder) {      System.out.println(order);    }  }
  /**   * 根据订单id修改订单状态   */  public void changeOrderValue() {    System.out.println("请输入您要修改状态的订单id");    String id = sc.next();    Order order = o.findById(id);    if (order == null) {      System.out.println("没有当前id的订单，请检查输入");    } else {      System.out.println("已找到当前id订单" + order);      System.out.println("请输入您要修改的状态：0:未支付 1：已支付 2：配送中 3：已完成");      int value = sc.nextInt();      Order t = new Order(order.getOrderID(), order.getUtime(), order.getDishes(), order.getOrdernum(),          order.getuID(), order.getOrderprice(), value);      o.insert(t);      System.out.println("修改成功了！！！");    }
  }  /**   * 显示所有菜品(按菜品销量从高到低排序输出)   */  public void showAllDishesByUser() {    List list = d.findAll();    Collections.sort(list, (p1, p2) -> p1.getDsales() - p2.getDsales());    System.out.println(list);  }
  /**   * 点餐（输入菜品id和购买数量）   */  public void shopDishes(User user) {    showAllDishesByUser();    System.out.println("请输入您要购买的id和数量：按照(id/数量)");    String str = sc.next();    String[] info = str.split("/");    // 判断输入是否符合要求，不符合则要求重新输入    if (info.length < 2) {      System.out.println("输入有误，请重新输入：");      shopDishes(user);    } else {      LocalDateTime l = LocalDateTime.now();      // String orderID, LocalDateTime utime, Dishes dishes, int ordernum, String uID,      // Double orderprice,int orderValue      Order t = new Order(info[0], l, d.findById(info[0]), Integer.parseInt(info[1]), user.getuID(),          o.findById(info[0]).getOrderprice(), o.findById(info[0]).getOrderValue());      o.insert(t);      System.out.println("订单已生成！！！" + o.findById(info[0]));    }  }
  /**   * 根据菜品类别显示所有菜品   */  public void ShowOfTypeByUser() {    System.out.println("请输入您要查找的类别：");    String str = sc.next();    System.out.println(d.findByType(str));
  }
  /**   * 查看所有订单(当前登录用户的)   */  public void showAllOrderByUser(User user) {    List list = o.findByuId(user.getuID());    for (Order order : list) {      System.out.println(order);    }  }
  /**   * 修改密码（当前登录用户的）   */  public void changePwdByUser(User user) {    u.changepwd(user.getuID());    System.out.println("修改成功！！");  }
  /**   * 个人信息显示   */  public void showByUser(User user) {    User findById = u.findById(user.getuID());    System.out.println(findById);  }   //待补充功能，删除管理员  @Override  public void delete(String id) {
  }  //待补充功能，添加管理员  @Override  public void insert(Admin t) {    // TODO Auto-generated method stub
  }  //待补充功能，通过id即账号查找管理员  @Override  public Admin findById(String id) {
    return map.get(id);  }  //待补充功能，显示所有管理员  @Override  public List findAll() {    // TODO Auto-generated method stub    return null;  }     //先设置系统默认数据  public void addMessage() {    map.put("qwl", new Admin("10086", "qwl", "123456"));    LocalDate time = LocalDate.now();    Dishes d1 = new Dishes("1", "红烧猪蹄", "肉类", time, 12.5, 20, 30);    d.insert(d1);    Dishes d2 = new Dishes("2", "鸡公煲", "肉类", time, 21.5, 30, 20);    d.insert(d2);    Dishes d3 = new Dishes("3", "麻辣香锅", "火锅类", time, 30, 5, 10);    d.insert(d3);    Dishes d4 = new Dishes("4", "水煮肉片", "肉类", time, 15, 12, 15);    d.insert(d4);    Dishes d5 = new Dishes("5", "水果沙拉", "水果类", time, 6, 70, 60);    d.insert(d5);    // String orderID, LocalDateTime utime, Dishes dishes, int ordernum, String uID,    // Double orderprice,int orderValue    LocalDateTime localdatetime = LocalDateTime.now();    Order o1 = new Order("1", localdatetime, d1, 10, "1001", 60.0, 1);    o.insert(o1);    Order o2 = new Order("2", localdatetime, d2, 5, "1002", 50.0, 10);    o.insert(o2);    Order o3 = new Order("3", localdatetime, d3, 5, "1003", 40.0, 5);    o.insert(o3);    Order o4 = new Order("4", localdatetime, d4, 5, "1004", 30.0, 6);    o.insert(o4);    Order o5 = new Order("5", localdatetime, d5, 5, "1005", 20.0, 8);    o.insert(o5);    // String uID, String uname, String usex, String upwd, String uadress, String    // utel, LocalDateTime utime    User u1 = new User("1001", "张三", "男", "123456", "湖北", "13545286487", localdatetime);    u.insert(u1);    User u2 = new User("1002", "李四", "男", "234567", "湖南", "15927948976", localdatetime);    u.insert(u2);    User u3 = new User("1003", "王五", "男", "345678", "江苏", "15927986854", localdatetime);    u.insert(u3);    User u4 = new User("1004", "刘柳", "女", "456789", "浙江", "18771580860", localdatetime);    u.insert(u4);    User u5 = new User("1005", "赵琦", "女", "567890", "新疆", "18771580750", localdatetime);    u.insert(u5);  }
}

2. Order属性管理类

package com.softeem.lesson23.test2;
import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Objects;import java.util.Set;
public class OrderSys implements DAO {  static Map<String, Order> ordermap = new HashMap<>();  static List orderlist = new ArrayList<>();  /**   * 新增订单   */  @Override  public void insert(Order t) {    ordermap.put(t.getOrderID(), t);
  }  /**   * 通过订单id查找订单   */  @Override  public Order findById(String id) {    if (ordermap.get(id) == null) {      return null;    } else {      return ordermap.get(id);    }
  }  /**   * 通过用户id查询用户的所有订单，并返回一个list集合   * @param uid   * @return   */  public List findByuId(String uid) {    List list = new ArrayList<>();    Set<String> keys = ordermap.keySet();    for (String key : keys) {      if (Objects.equals(uid, ordermap.get(key).getuID())) {        list.add(ordermap.get(key));      }    }    return list;  }
  /**   * 显示所有订单   */  @Override  public List findAll() {    Set<String> keys = ordermap.keySet();    for (String key : keys) {      orderlist.add(ordermap.get(key));    }    return orderlist;  }  /**   * 待完成功能，删除订单   */  @Override  public void delete(String id) {    // TODO Auto-generated method stub
  }}

3. User属性管理类

package com.softeem.lesson23.test2;
import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Scanner;import java.util.Set;
//客户id，客户名，性别，密码，送餐地址，手机号，创建时间public class UserSys implements DAO {  static Map<String, User> usermap = new HashMap<>();  List list = new ArrayList<>();  Scanner sc = new Scanner(System.in);
  /**   * 添加客户   */  @Override  public void insert(User t) {    usermap.put(t.getuID(), t);
  }
  /**   * 查看客户列表   */  @Override  public List findAll() {    Set<String> keys = usermap.keySet();    for (String str : keys) {      list.add(usermap.get(str));    }    return list;  }
  /**   * 删除指定id的客户   */  @Override  public void delete(String id) {    if (usermap.get(id) == null) {      System.out.println("没有当前id的客户");    } else {      System.out.println(usermap.get(id) + "已删除！！！");      usermap.remove(id);    }
  }
  /**   * 修改密码（当前登录用户的）   */  public void changepwd(String id) {    User user = findById(id);    System.out.println("请输入新密码：");    String str = sc.next();    User t = new User(user.getuID(), user.getUname(), user.getUsex(), str, user.getUadress(), user.getUtel(),        user.getUtime());    usermap.put(id, t);
  }
  /**   * 通过id查找对应客户   */  @Override  public User findById(String id) {    if (usermap.get(id) == null) {      return null;    } else {      return usermap.get(id);    }
  }
}

4. Dishes属性管理类

package com.softeem.lesson23.test2;
import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Objects;import java.util.Set;
public class DishesSys implements DAO {  // 建立一个菜品的map集合，其中菜品的id为map的键，整个菜品对象为map的值  static Map<String, Dishes> dishesmap = new HashMap<>();  Set<String> keys = dishesmap.keySet();
  /**   * 添加菜品   */  @Override  public void insert(Dishes t) {    dishesmap.put(t.getdID(), t);
  }
  /**   * 通过id来寻找菜品   */
  @Override  public Dishes findById(String id) {    if (dishesmap.get(id) == null) {      return null;    } else {      return dishesmap.get(id);    }  }
  /**   * 根据菜品类型查找菜品   */  public List findByType(String type) {    List list = new ArrayList<>();    for (String key : keys) {      if (Objects.equals(type, dishesmap.get(key).getDtype())) {        list.add(dishesmap.get(key));      }
    }    return list;  }
  /**   * 查询所有菜品   */  @Override  public List findAll() {    List list = new ArrayList<>();
    for (String str : keys) {      list.add(dishesmap.get(str));    }    return list;  }
  public void selectBytype(String typename) {    int count = 0;    for (String key : keys) {      if (Objects.equals(dishesmap.get(key).getDtype(), typename)) {        System.out.println(dishesmap.get(key));        count++;      }    }    if (count == 0) {      System.out.println("没有当前类别的菜品！");    }  }
  /**   * 删除指定id菜品   */  @Override  public void delete(String id) {    if (dishesmap.get(id) == null) {      System.out.println("输入id错误...");    } else {      dishesmap.remove(id);    }
  }}

以上基本就是代码的核心部分，剩下的部分就简化很多了，建立一个菜单类，分别对其进行不同调用就行了

三、菜单类

package com.softeem.lesson23.test2;
import java.util.Objects;import java.util.Scanner;
public class Menu {  static AdminSys admin = new AdminSys();  Scanner sc = new Scanner(System.in);
  public void showMenu() {    admin.addMessage();
    System.out.println("请输入账号和密码：按照(账号/密码)");    String str = sc.next();    String[] info = str.split("/");    if (info.length < 2) {      System.out.println("输入有误，请重新输入：");      showMenu();    } else {      if (admin.findById(info[0]) != null && Objects.equals(admin.findById(info[0]).getApwd(), info[1])) {        adminMenu();      } else if (admin.findUserByid(info[0]) != null          && Objects.equals(info[1], admin.findUserByid(info[0]).getUpwd())) {        User user = admin.findUserByid(info[0]);        userMenu(user);      } else {        System.out.println("输入有误，请重新输入....");        showMenu();      }    }
  }
  public void userMenu(User user) {    System.out.println("=========欢迎来到订餐系统=======");    System.out.println("====【1】点餐=================");    System.out.println("====【2】根据菜品类别显示所有菜品===");    System.out.println("====【3】查看所有订单============");    System.out.println("====【4】修改密码===============");    System.out.println("====【5】个人信息显示============");    System.out.println("====【6】退出==================");    System.out.println("请输入您要进行的操作：");    String n = sc.next();    switch (n) {    case "1":      admin.shopDishes(user);      userMenu(user);      break;    case "2":      admin.ShowOfTypeByUser();      userMenu(user);      break;    case "3":      admin.showAllOrderByUser(user);      userMenu(user);      break;    case "4":      admin.changePwdByUser(user);      userMenu(user);      break;    case "5":      admin.showByUser(user);      userMenu(user);      break;    case "6":      System.out.println("谢谢使用，再见！");      System.exit(0);    default:      System.out.println("输入错误，请重新输入：");      userMenu(user);    }  }
  public void adminMenu() {    System.out.println("=========欢迎您尊贵的管理员=======");    System.out.println("====【1】添加菜品===============");    System.out.println("====【2】查看所有菜品信息显示=======");    System.out.println("====【3】查看指定类别的菜品信息=====");    System.out.println("====【4】根据菜品id修改菜品价格=====");    System.out.println("====【5】删除指定id的菜品=========");    System.out.println("====【6】添加客户================");    System.out.println("====【7】查看客户列表=============");    System.out.println("====【8】删除指定id的用户==========");    System.out.println("====【9】订单列表显示=============");    System.out.println("====【10】根据订单id修改订单状态====");    System.out.println("====【11】退出=================");    String m = sc.next();    switch (m) {    case "1":      admin.addDishes();      adminMenu();      break;    case "2":      System.out.println("请输入您需要每行显示多少数据：");      int pageSize = sc.nextInt();      admin.showAllDishes(pageSize);      adminMenu();      break;    case "3":      admin.selecBytypeOfAdmin();      adminMenu();      break;    case "4":      admin.selectByDishesID();      adminMenu();      break;    case "5":      admin.deleteDishes();      adminMenu();      break;    case "6":      admin.addUser();      adminMenu();      break;    case "7":      admin.findUser();      adminMenu();      break;    case "8":      admin.deleteUserByAdmin();      adminMenu();      break;    case "9":      admin.showAllOrder();      adminMenu();      break;    case "10":      admin.changeOrderValue();      adminMenu();      break;    case "11":      System.out.println("谢谢使用，再见！");      System.exit(0);      break;    default:      System.out.println("输入错误，请重新输入：");      adminMenu();    }  }}

这里switch采取String（jdk1.7以后才支持）可以让用户就算输入错误也不会报错导致程序运行终止，又要重新输入（我摊牌了，就是懒）。

四、测试类

package com.softeem.lesson23.test2;
public class Test {  public static void main(String[] args) {    Menu m = new Menu();    m.showMenu();  }}

五、实现部分界面截图

以上就是全部代码。