超市管理系统v2.0

• 超市管理系统v2.0

1. 比起v1.0增加了 用户注册登录的功能（超市管理系统v1.0）
2. 并且使用ArrayList改进了代码，减少了代码冗杂。（ArrayList类）
3. 下面的v2.0的大概思路。

• 思路流程图：

• 登录

• 注册

• 注册流程：

  • 明确用户信息？
  • 设计类--->User
    • 用户名
    • 密码
    • 验证码：作业？
  • 要求用户输入个人信息：
    • 用户名
    • 密码
    • 确认密码（防止用户输入错误）
    • 需要判断两次密码是否一致，不一致则需要重新输出，一致则需要组装成一个用户对象。

• 超市类代码：

package com.zhou.supermarket1;
 
import java.util.ArrayList;
import java.util.Scanner;
 
public class SuperMarket1 {
    private ArrayList<Goods1> goodslist = new ArrayList<>();
    private String name;
    private ArrayList<User1> users = new ArrayList<User1>();
    //记录当前用户是否登录
    private User1 currentUser;
 
    public SuperMarket1(String name) {
        ArrayList<Goods1> goodslist = new ArrayList<>();
        ArrayList<User1> users = new ArrayList<User1>();
        this.name = name;
        initialization();
    }
 
    public User1 getCurrentUser() {
        return currentUser;
    }
 
    //菜单
    public void menu() {
        System.out.println("==================== 欢迎光临【" + name + "超市】 ====================");
        System.out.print("1：商品列表 ");
        System.out.print("2：添加商品 ");
        System.out.print("3：删除商品 ");
        System.out.println("4：修改商品 ");
        System.out.print("5：用户注册 ");
        System.out.print("6：用户登录 ");
        System.out.println("7：查看用户信息");
    }
 
    //初始化三个商品信息到容器中
    public void initialization() {
        Goods1 g1 = new Goods1();
        g1.setCode("9527");
        g1.setName("苹果");
        g1.setPrice(9.9);
 
        Goods1 g2 = new Goods1();
        g2.setCode("9528");
        g2.setName("柠檬");
        g2.setPrice(5.0);
 
        Goods1 g3 = new Goods1();
        g3.setCode("9529");
        g3.setName("蓝莓");
        g3.setPrice(9.2);
        goodslist.add(g1);
        goodslist.add(g2);
        goodslist.add(g3);
    }
 
    //展示商品
    public void showGoods() {
        System.out.println("货物清单");
        System.out.println("==================== 商品库存清单 ====================");
        System.out.println("商品编号       商品名称       商品单价");
        for (int i = 0;i<goodslist.size();i++) {
            Goods1 g = goodslist.get(i);
            System.out.println(g.getCode()+"           "+g.getName()+"            "+g.getPrice());
        }
    }
 
    //添加商品
    public void addGoods() {
        System.out.println("==================== 添加商品 ====================");
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要添加商品编号：");
        String code = sc.next();
        System.out.println("请输入要添加商品名称：");
        String name = sc.next();
        System.out.println("请输入要添加商品价格：");
        double price = sc.nextDouble();
        goodslist.add(new Goods1(code,name,price));
        System.out.println("添加数据成功！！！");
    }
 
    //删除商品
    public void delGoods() {
        System.out.println("==================== 删除商品 ====================");
        while (true) {
            Scanner scanner = new Scanner(System.in);
            System.out.println("请输入要删除的商品编号;");
            String code = scanner.next();
            for (int i = 0; i < goodslist.size(); i++) {
                Goods1 g = goodslist.get(i);
                if (code.equals(g.getCode())) {
                    goodslist.remove(i);
                    System.out.println("？删除成功");
                    return;
                }
            }
            System.out.println("输入的编号：" + code + "  不存在，请重新输入！");
 
        }
    }
 
    //修改商品
    public void updateGoods() {
        System.out.println("==================== 修改商品 ====================");
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请输入要修改的商品编号;");
            String code = scanner.next();
            for (int i = 0; i < goodslist.size(); i++) {
                Goods1 g = goodslist.get(i);
                if (code.equals(g.getCode())) {
                    System.out.println("请输入要修改的商品名称：");
                    String name = scanner.next();
                    System.out.println("请输入要修改的商品价格：");
                    double price = scanner.nextDouble();
                    g.setName(name);
                    g.setPrice(price);
                    System.out.println("运气真好，修改成功！！！");
                    return;
                }
            }
            System.out.println("您修改的商品编号："+code+"  不存在，请重新输入。");
        }
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    //用户注册
    public void register() {
        System.out.println("==================== 用户注册 ====================");
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入用户名：");
        String username = sc.next();
        String password = "123456";
        while (true) {
            System.out.println("请输入密码：");
            password = sc.next();
            System.out.println("请输入确认密码：");
            String password1 = sc.next();
            if (!password.equals(password1)) {
                System.out.println("您输入的两次密码不一致，请重新输入密码");
                continue;
            }else {
                System.out.println("恭喜你注册成功！！！");
                users.add(new User1(username,password));
                return;
            }
        }
    }
 
    //用户登录
    public void login() {
        System.out.println("==================== 用户登录 ====================");
        //根据用户输入的用户名和密码 进行匹配
        Scanner sc = new Scanner(System.in);
        System.out.println("如果你还没有注册账户，是否需要注册？ yes/on");
        String judege = sc.next();
        if (judege.equals("yes")) {
            register();
            System.out.println("开始登陆：");
        }
        while (true) {
            System.out.println("请输入用户名：");
            String username = sc.next();
            System.out.println("请输入密码：");
            String password = sc.next();
            for (int i = 0;i<users.size();i++) {
                User1 u = users.get(i);
                if (!username.equals(u.getUsername())) {
                    System.out.println("您输入的用户名有误，请重新输入");
                    continue;
                }else if(!password.equals(u.getPassword())) {
                    System.out.println("您输入的密码错误，请重新输入");
                    continue;
                }else {
                    System.out.println("登陆成功！");
                    currentUser = u;
                    return;
                }
            }
        }
     }
 
 
     //查看当前系统注册的用户信息
    public void showUsers() {
        System.out.println("=================== 查看用户信息 ===================");
        System.out.println("用户名      密码");
        for (int i = 0;i<users.size();i++) {
            User1 u = users.get(i);
            System.out.println(u.getUsername()+"      "+u.getPassword());
 
        }
 
    }
}

• 商品类代码：

package com.zhou.supermarket1;
 
public class Goods1 {
    private String code;
    private String name;
    private double price;
 
    public Goods1() {
 
    }
 
    public Goods1(String code, String name, double price) {
        this.code = code;
        this.name = name;
        this.price = price;
    }
 
    public void setCode(String code) {
        this.code = code;
    }
 
    public String getCode() {
        return code;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public double getPrice() {
        return price;
    }
 
    public void setPrice(double price) {
        this.price = price;
    }
}

• 用户类代码：

package com.zhou.supermarket1;
 
public class User1 {
    //用户信息
    private String username;
    private String password;
 
    public User1() {
 
    }
 
    public User1(String username, String password) {
        this.username = username;
        this.password = password;
    }
 
    public String getUsername() {
        return username;
    }
 
    public void setUsername(String username) {
        this.username = username;
    }
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
}

• 测试类代码：

package com.zhou.supermarket1;
 
import java.util.Scanner;
 
public class SuperMarketTest1 {
    public static void main(String[] args) {
        SuperMarket1 supermarket1 = new SuperMarket1("白昼");
        Scanner sc = new Scanner(System.in);
        while (true) {
            supermarket1.menu();
            System.out.print("请输入对应的功能编号：");
            int num = sc.nextInt();
            if (num == 2 || num == 3 || num == 4 || num == 7) {
                if (supermarket1.getCurrentUser()==null) {
                    System.out.println("当前操作需要登录");
                    supermarket1.login();
                }
            }
            switch (num) {
                case 1:
                    supermarket1.showGoods();
                    break;
                case 2:
                    supermarket1.addGoods();
                    break;
                case 3:
                    supermarket1.delGoods();
                    break;
                case 4:
                    supermarket1.updateGoods();
                    break;
                case 5:
                    supermarket1.register();
                    break;
                case 6:
                    supermarket1.login();
                    break;
                case 7:
                    supermarket1.showUsers();
                    break;
                default:
                    System.out.println("输入的数据有误");
                    break;
            }
        }
 
    }
}