超市会员卡管理系统

用Map 集合存储会员卡

package shopsystem;

public class Card {
    private String name;// 姓名
    private String cardNum;// 卡号
    private String code;// 密码
    private String date;// 开卡日期
    private int score;// 积分

    @Override
    public String toString() {
        return "开卡人姓名：" + this.name + ", 卡号：" + this.cardNum + ", 剩余积分：" + this.score + ", 开卡日期：" + this.date;
    }

    public Card() {
    }

    public Card(String name, String cardNum, String code, String date, int score) {
        this.name = name;
        this.cardNum = cardNum;
        this.code = code;
        this.date = date;
        this.score = score;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCardNum() {
        return cardNum;
    }

    public void setCardNum(String cardNum) {
        this.cardNum = cardNum;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public int getScore() {
        return score;
    }

    public void setScore(int score) {
        this.score = score;
    }

}

Card

package shopsystem;

import java.text.SimpleDateFormat;
import java.util.*;

public class Action {
    static Scanner input = new Scanner(System.in);

    // 生成随机卡号
    public static String cardNum() {
        StringBuffer buf = new StringBuffer();

        for (int i = 0; i < 10; ++i) {
            Random r = new Random();
            buf.append(r.nextInt(9));
        }

        return buf.toString();
    }

    // 开卡
    public static void register() {
        System.out.println("请输入注册人姓名：");
        String name = input.next();
        System.out.println("请输入注册密码：");
        String code;
        for (code = input.next(); code.length() < 6; code = input.next()) {
            System.out.println("密码设置的位置不能小于6位，请重新输入：");
        }

        Date date = new Date();
        SimpleDateFormat sim = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
        String riqi = sim.format(date);
        String cardNum;
        do {
            cardNum = cardNum();
        } while (ShopSys.map.containsKey(cardNum));

        System.out.println("开卡成功，送您100积分！您的会员卡号是:" + cardNum);
        ShopSys.map.put(cardNum, new Card(name, cardNum, code, riqi, 100));
    }

    // 累计积分
    public static void addScore() {
        System.out.println("请输入卡号：");
        String cardNum = input.next();
        System.out.println("请输入密码：");
        String code = input.next();

        if (ShopSys.map.containsKey(cardNum)) {
            boolean boo = ShopSys.map.get(cardNum).getCode().equals(code);
            if (boo) {
                System.out.println("请输入您此次消费金额(每消费1元加1积分)：");
                int score = input.nextInt();
                ShopSys.map.get(cardNum).setScore(ShopSys.map.get(cardNum).getScore() + score);
                System.out.println("积分累计成功，当前积分为：" + ShopSys.map.get(cardNum).getScore());
            } else {
                System.out.println("您输入的密码错误，积分累计失败！！");
            }

        } else {
            System.out.println("对不起，没有找到该卡号！！");
        }
    }

    // 查询会员卡信息
    public static void inquire() {
        System.out.println("请输入您的会员卡号：");
        String cardNum = input.next();
        System.out.println("请输入密码：");
        String code = input.next();

        if (ShopSys.map.containsKey(cardNum)) {
            boolean boo = ShopSys.map.get(cardNum).getCode().equals(code);
            if (boo) {
                System.out.println("您查询的会员卡信息如下：\n" + ShopSys.map.get(cardNum));
            } else {
                System.out.println("您输入的密码错误，查询失败！！");
            }

        } else {
            System.out.println("对不起，没有找到该卡号！！");
        }

    }

    // 修改密码
    public static void alterCode() {
        System.out.println("请输入会员卡号：");
        String cardNum = input.next();
        System.out.println("请输入密码：");
        String code = input.next();

        if (ShopSys.map.containsKey(cardNum)) {
            boolean boo = ShopSys.map.get(cardNum).getCode().equals(code);
            if (boo) {
                String newCode;
                System.out.println("请输入新密码：");
                for (newCode = input.next(); newCode.length() < 6; newCode = input.next()) {
                    System.out.println("密码设置的位置不能小于6位，请重新输入：");
                }
                ShopSys.map.get(cardNum).setCode(newCode);
                System.out.println("您的会员卡密码修改成功！！！");
            } else {
                System.out.println("您输入的密码错误，修改密码失败！！");
            }
        } else {
            System.out.println("对不起，没有找到该卡号！！");
        }
    }

    // 积分兑换
    public static void conversion() {
        System.out.println("请输入会员卡号：");
        String cardNum = input.next();
        System.out.println("请输入密码：");
        String code = input.next();
        if (ShopSys.map.containsKey(cardNum)) {
            boolean boo = ShopSys.map.get(cardNum).getCode().equals(code);
            if (boo) {
                System.out.println("请输入您需要兑换使用的积分(每100积分抵用0.1元，不足100积分不做抵用)：");
                int num = input.nextInt();
                if (num < 100) {
                    System.out.println("兑换积分不能小于100！");
                } else {
                    if (ShopSys.map.get(cardNum).getScore() - num > 0) {
                        ShopSys.map.get(cardNum).setScore(ShopSys.map.get(cardNum).getScore() - num / 100 * 100);
                        System.out.println("积分兑换成功，您已用会员卡积分抵用了" + (double) (num / 100) * 1.0D + "元！");
                        return;
                    } else {
                        System.out.println("对不起，你当前积分不足！！！");
                    }
                }
            } else {
                System.out.println("您输入的密码错误，积分兑换失败！！");
            }
        } else {
            System.out.println("对不起，没有找到该卡号！！");
        }
    }

}

系统相应的功能

package shopsystem;

import java.util.*;

public class ShopSys {
    static Map<String,Card> map = new HashMap<String, Card>();
    static Scanner input = new Scanner(System.in);

    public static void operation() {
        System.out.println("******************************XX超市会员管理系统****************************************");
        String select = "";
        start1: do {
            System.out.println("1、积分累计\n2、积分兑换\n3、查询积分\n4、修改密码\n5、开卡\n6、退出");
            System.out.println("请选择：");
            String str = input.next();
            switch (str) {
            case "1":
                Action.addScore();
                break;
            case "2":
                Action.conversion();
                break;
            case "3":
                Action.inquire();
                break;
            case "4":
                Action.alterCode();
                break;
            case "5":
                Action.register();
                break;
            case "6":
                System.out.println("正在退出系统.......");
                break start1;
            }
            System.out.println("输入0返回，输入其它信息退出系统，请输入：");
            select = input.next();
        } while (select.equals("0"));

        System.out.println("程序退出！");
    }
    //测试
    public static void main(String[] args) {
        operation();
    }
}

超市管理系统

实际效果

开卡

输入错误卡号或密码的效果

累计积分

查询积分（有点小bug重新运行后继续）

积分兑换

修改密码

退出

原文地址：https://www.cnblogs.com/zeng1997/p/11254543.html