【Java练手项目】Java外卖点餐系统

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:

  1. 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 …

  2. 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

  3. 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:

  4. 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<T> 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<Admin> {  static Map<String, Admin> map = new HashMap<>();//  static Set<String> 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<Dishes> 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<User> 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<Order> 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<Dishes> 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<Order> 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<Admin> 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<Order> {  static Map<String, Order> ordermap = new HashMap<>();  static List<Order> 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<Order> findByuId(String uid) {    List<Order> 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<Order> 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<User> {  static Map<String, User> usermap = new HashMap<>();  List<User> 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<User> 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<Dishes> {  // 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<Dishes> findByType(String type) {    List<Dishes> 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<Dishes> findAll() {    List<Dishes> 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。

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