JAVA-银行账户系统学习笔记

songshao

最近上编程课学习都挺晚的,没时间逛论坛了,今天休息正好也赶上线上,所以来发点学习笔记,一起讨论学习.(看我这个标点符号就知道我学编程的了吧)
先看这个银行系统
一:代码实现步骤

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1:新建账号类:

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[Java] 纯文本查看 复制代码

package domin;

public class Account {
    private String name;
    private String id;
    private String password;
    private double money;
    private double quotaMoney;

    public Account() {
    }

    public Account(String name, String id, String password, double money, double quotaMoney) {
        this.name = name;
        this.id = id;
        this.password = password;
        this.money = money;
        this.quotaMoney = quotaMoney;
    }

    public String getName() {
        return name;
    }

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

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public double getMoney() {
        return money;
    }

    public void setMoney(double money) {
        this.money = money;
    }

    public double getQuotaMoney() {
        return quotaMoney;
    }

    public void setQuotaMoney(double quotaMoney) {
        this.quotaMoney = quotaMoney;
    }


}

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2:建立一个main入口

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[Java] 纯文本查看 复制代码

package system;

import domin.Account;

import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

public class Enter {

    //主方法界面
    public static void main(String[] args) {
        ArrayList<Account> list = new ArrayList<>();
        Account zhangsan = new Account("张三", "12345678", "123456", 90000.0, 90000.0);
        list.add(zhangsan);
        Account lisi = new Account("李四", "12345", "123456", 90000.0, 90000.0);
        list.add(lisi);
        Scanner sc = new Scanner(System.in);
        while (true) {
            System.out.println("欢迎来到吾爱破解银行");
            System.out.println("1. 登录账号");
            System.out.println("2. 注册账号");
            int type = sc.nextInt();
            switch (type) {
                case 1:
                    System.out.println("欢迎来到登录界面");
                    login(list, sc);
                    break;
                case 2:
                    System.out.println("欢迎来到注册界面");
                    register(list, sc);
                    break;
                default:
                    System.out.println("您的输入有误,请重新输入");
                    break;
            }

        }
    }

    //账号注册
    private static void register(ArrayList<Account> list, Scanner sc) {
        System.out.println("请输入您的姓名");
        String name = sc.next();
        String password;
        while (true) {
            System.out.println("请输入您的密码:");
            password = sc.next();
            System.out.println("请输入再次确认您的密码:");
            String password1 = sc.next();
            if (password.equals(password1)) {
                break;
            }
            System.out.println("两次密码输入不一致,请重新输入");
        }
        System.out.println("请输入当次提现额度:");
        double quotaMoney = sc.nextDouble();
        String cardID = getcardID(list);
        Account temp = new Account(name, cardID, password, 0.0, quotaMoney);
        list.add(temp);
        System.out.println("开户成功" + temp.getName() + "\t" + temp.getId() + "\t" + temp.getMoney() + "\t" + temp.getQuotaMoney());
    }

    //卡号生成,返回卡号
    public static String getcardID(ArrayList<Account> list) {
        Random random = new Random();
        String cardID = "";
        while (true) {
            for (int i = 0; i < 8; i++) {
                cardID += random.nextInt(10);
            }
            Account account = isExtened(list, cardID);
            if (account == null) {
                break;
            } else {
                System.out.println("卡号重复");
            }
        }
        return cardID;

    }

    //账号查重,返回对象账户
    public static Account isExtened(ArrayList<Account> list, String id) {

        for (int i = 0; i < list.size(); i++) {
            Account account = list.get(i);
            if ((account.getId()).equals(id)) {
                return account;
            }
        }
        return null;

    }

    //登录界面
    private static void login(ArrayList<Account> list, Scanner sc) {
        System.out.println("============欢迎您进入登录界面===============");
        Account account;
        while (true) {
            System.out.println("请输入您的账户:");
            String tempid = sc.next();
            account = isExtened(list, tempid);
            if (account == null) {
                System.out.println("您的账号输入错误!重新输入");
            } else {
                break;
            }
        }
        for (int i = 0; i < 3; i++) {
            System.out.println("请输入您的密码:");
            String tempwd = sc.next();
            if ((account.getPassword()).equals(tempwd)) {
                System.out.println("登陆成功");
                break;
            } else {
                if (2 - i == 0) {
                    System.out.println("您的账户已被锁定,请联系管理员解锁");
                    return;
                }
                System.out.println("密码输入错误,您还有" + (2 - i) + "次机会");
            }

        }
        useroperation(account, list, sc);
        return;
    }

    //用户操作界面
    private static void useroperation(Account account, ArrayList<Account> list, Scanner sc) {
        while (true) {
            System.out.println("==============欢迎来到用户操作界面==============");
            System.out.println("1. 查询");
            System.out.println("2. 存款");
            System.out.println("3. 取款");
            System.out.println("4. 转账");
            System.out.println("5. 修改密码");
            System.out.println("6. 退出账户");
            System.out.println("7. 注销账户");
            int type = sc.nextInt();
            switch (type) {
                case 1:
                    checkAccount(account);
                    System.out.println("查询成功");
                    break;
                case 2:
                    saveMoney(account, sc);
                    break;
                case 3:
                    withDrawal(account, sc);
                    break;
                case 4:
                    transMoney(list, account, sc);
                    break;
                case 5:
                    reSet(account, sc);
                    return;
                case 6:
                    System.out.println("退出账户成功");
                    return;
                case 7:
                    boolean flag = logOff(list, account, sc);
                    if (flag) {
                        return;
                    }
                    break;

                default:
                    System.out.println("您的输入有误");
                    break;

            }
        }
    }

    //账户查看界面
    public static void checkAccount(Account account) {
        System.out.println("姓名\t\t账号\t\t账户余额\t\t当次提现额度");
        System.out.println(account.getName() + "\t\t" + account.getId() + "\t\t" + account.getMoney() + "\t\t" + account.getQuotaMoney());

    }

    //用户存款界面
    private static void saveMoney(Account account, Scanner sc) {
        System.out.println("请输入您存入的金额:");
        double savemoney = sc.nextInt();
        if (savemoney % 100 != 0) {
            System.out.println("存入的金额仅能为100的整数倍");
            return;
        }
        if (savemoney == 0) {
            System.out.println("您尚未存入金额,请查验,如有疑问请联系银行客服");
            return;
        }
        account.setMoney(account.getMoney() + savemoney);
        System.out.println("存款成功,您的账户余额为:" + account.getMoney());
    }

    //用户取款界面
    public static void withDrawal(Account account, Scanner sc) {

        System.out.println("请输入您要取出的金额:");
        double outMoney = sc.nextDouble();
        if (outMoney % 100 != 0) {
            System.out.println("取出的金额仅能为100的整数倍");
            return;
        }
        if (outMoney > account.getMoney() || outMoney > account.getQuotaMoney() || outMoney == 0) {
            System.out.println("您的账户余额不足或当次取款限额不足或取款金额为0,请重新输入:");
            return;
        } else {
            account.setMoney(account.getMoney() - outMoney);
            account.setQuotaMoney(account.getQuotaMoney() - outMoney);

        }

        System.out.println("取款成功,您的账户余额为:" + account.getMoney());
        return;

    }

    //用户转账界面
    public static void transMoney(ArrayList<Account> list, Account account, Scanner sc) {
        double outMoney;
        if (list == null || list.size() < 2) {
            System.out.println("当前暂无可用转账账户");
            return;
        }
        while (true) {
            System.out.println("请输入您要转账的账号");
            String inAccountId = sc.next();
            Account intemp = isExtened(list, inAccountId);
            if (intemp == null || intemp.getId().equals(account.getId())) {
                System.out.println("暂无该账户或不能给自己转账,请检查后再次输入");
            } else {
                while (true) {
                    System.out.println("请输入您的转账金额:");
                    outMoney = sc.nextDouble();
                    if (outMoney > account.getMoney() || outMoney == 0) {
                        System.out.println("您的账户余额不足或转账金额为0,请重试");
                    } else {
                        break;
                    }
                }
                while (true) {
                    String name = intemp.getName();
                    char tempch = name.charAt(0);
                    String newname = name.replace(tempch, '*');
                    System.out.println("您要给账户为" + intemp.getId() + "转账:" + outMoney + "元,请输入该账户户主姓氏确认转账:" + newname);
                    String inch1 = sc.next();
                    char inch = inch1.charAt(0);
                    boolean flag = flag(inch, tempch);
                    if (flag) {
                        System.out.println("信息对比有误 ,请重新输入");
                    } else {
                        account.setMoney(account.getMoney() - outMoney);
                        intemp.setMoney(intemp.getMoney() + outMoney);
                        System.out.println("转账成功");
                        return;
                    }
                }
            }
        }
    }

    //账户户主姓氏对比
    public static boolean flag(char inch, char tempch) {
        if (inch == tempch) {
            return false;
        }
        return true;
    }

    //账户密码修改界面
    public static void reSet(Account account, Scanner sc) {
        while (true) {
            System.out.println("请输入原密码:");
            String oldPwd = sc.next();
            if (oldPwd.equals(account.getPassword())) {
                System.out.println("请输入新设的密码");
                String newPwd1 = sc.next();
                System.out.println("请第二次输入新设的密码");
                String newPwd2 = sc.next();
                if (newPwd1.equals(newPwd2)) {
                    account.setPassword(newPwd1);
                    return;
                } else {
                    System.out.println("两次密码输入不一致");
                }

            } else {
                System.out.println("密码输入错误,请重新输入");
            }
        }


    }

    //账户注销界面
    public static boolean logOff(ArrayList<Account> list, Account account, Scanner sc) {
        System.out.println("请输入账户密码:");
        String pwd = sc.next();
        if (pwd.equals(account.getPassword())) {
            System.out.println("确认注销?(请确保账户余额为0,否则注销失败) 确认请按1. 取消注销请按其他键 ");
            int num = sc.nextInt();
            if (num == 1 && account.getMoney() == 0) {
                list.remove(account);
                System.out.println("注销账户成功");
                return true;
            }
            System.out.println("已取消注销账户操作或者余额不为0元");
            return false;
        }
        System.out.println("密码输入错误,已取消注销账户操作");
        return false;
    }
}

二:代码实现具体截图

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其他的内容我就不截图了,大家有兴趣的可以自己复制到运行器中看看(新手一个,不好,可以留下指导意见,勿喷,感谢嘴下留情).

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dxlydlvv

用spring框架写一个web给他

不忘形影

感谢感谢，最近也在学

sss998

谢谢分享，关系

吾爱葡萄

金额最好用bigdecimal类型

songshao

吾爱葡萄 发表于 2022-10-11 14:10
金额最好用bigdecimal类型

确实,这个学过后老师有讲过.bigdecimal的精度不会丢失,谢谢

lcg2014

楼主继续加油，

songshao

lcg2014 发表于 2022-10-11 14:35
楼主继续加油，

Thanks♪(･ω･)ﾉ

Ahuage98

是在黑马学的吗?黑马我们写的是学生管理系统

songshao

Ahuage98 发表于 2022-10-11 16:02
是在黑马学的吗?黑马我们写的是学生管理系统

是的哈哈,银行的学生的等等都写,你没写这个的话,可能是我们老师自己添加的