迷你MyBank

该迷你MyBank，存贮是用对象数组来存贮的，所以比较简单，容易理解，适合新手。。

一.创建chengyuan类,在其中声明所需的成员变量：

public class chengyuan {

    //该类为定义成员变量
    public String account;
    public String name ;
    public String password;
    public String idCard;
    public int money;
    
}

二.创建fulei类，就是调用

public class zhulei {
public static void main(String[] args) {
    fulei fu=new fulei();
    fu.ShowMenu();
    
}
}

三.创建zhulei类，在其中创建函数来实现具体的功能

import java.awt.image.SampleModel;
import java.util.Scanner;


public class fulei {
    Scanner input=new Scanner(System.in);
//    public void Init(){
//    chen.account[0]="001";
//    chen.name[0]="孙悟空";
//    chen.password[0]=
    
    chengyuan users []=new chengyuan[10];//此处是声明对象数组
    
    public void Init(){　　　　//此类是先对数组中插入一些值
            chengyuan u1=new chengyuan();
                u1.account = "001";
                u1.name = "sunwukong";
                u1.password = "wukong";
                u1.idCard = "123412341234123412";
                u1.money = 10000;
                users[0] = u1;
                chengyuan u2 = new chengyuan();
                u2.account = "002";
                u2.name = "zhubajie";
                u2.password = "bajie";
                u2.idCard = "123412341234123413";
                u2.money = 20000;
                users[1] = u2;
                chengyuan u3 = new chengyuan();
                u3.account = "003";
                u3.name = "shawujing";
                u3.password = "wujing";
                u3.idCard = "123412341234123414";
                u3.money = 30000;
                users[2] = u3;
    }
    
    public void ShowMenu() {
        // TODO Auto-generated method stub
        Init();        //初始化该对象数组
        while(true){
        System.out.println("======================================");
        System.out.println("===============MyBank=================");
        System.out.println("=功能菜单如下：========================");
        System.out.println("==1:开户 2:存款 3:取款 4:转账 5:查询余额==");
        System.out.println("====6:修改密码 7:显示所有信息 0:退出=====");
        System.out.println("================请选择================");
        
        
        if(input.hasNextInt()==true){        //判断系统输入是否为int类型
            int select=input.nextInt();
            switch (select) {
            case 1:
                CreatUsers();
                break;
            case 2:
                SaveMoney();
                break;
            case 3:
                OutMoney();
                break;
            case 4:
                MoveMoney();
                break;
            case 5:
                FindMoney();
                break;
            case 6:
                UpdatePwd();
                break;
            case 7:
                ShowInfo();
                break;
            case 0:
                System.out.println("系统退出，谢谢使用");
                return;
            default:
                System.out.println("只能输入0-7的数字！！！");
                break;
            }
        }else {
            System.out.println("输入内容中含非法字符，请重新尝试！");
            input.next();   //释放资源
        }
        
        System.out.println();          //换行
        System.out.println();
    }
//-----------------
    }
    
    /**
     * 修改密码
     */
    private void UpdatePwd() {
        // TODO Auto-generated method stub
        System.out.println("请输入账号:");
        String zhang=input.next();
        System.out.println("请输入密码:");
        String pwd=input.next();
        chengyuan u=GetUser(zhang);
        if (u==null) {
            System.out.println("库中无该账户");
            return;
        }
        if (!u.password.equals(pwd)) {
            System.out.println("密码错误，请重新尝试");
            return;
        }
        System.out.println("登录成功，可以修改密码！");
        System.out.println();
        for (int i = 1; i <= 3; i++) {        //三次循环
        System.out.println("请输入新密码:");
        String pwd_1=input.next();
        System.out.println("请再次输入密码:");
        String pwd_2=input.next();
        if(PwdSame(pwd_1, pwd_2)){
        u.password=pwd_1;
        System.out.println("账号:"+zhang+";密码修改成功,新密码为"+u.password);
        return;
        }else {
            if(i==2)
            System.out.println("两次密码输入不正确，请重新输入！！你还要两次输入机会");
            if(i==1)
            System.out.println("两次密码输入不正确，请重新输入！！你还要一次输入机会");
        }
        }
    }

    /**
     * 查询余额
     * 验证是否登录
     */
    private void FindMoney() {
        // TODO Auto-generated method stub
        System.out.println("请输入账号:");
        String zhang=input.next();
        System.out.println("请输入密码:");
        String pwd=input.next();
        chengyuan u=GetUser(zhang);
        if (u==null) {
            System.out.println("库中无该账户");
            return;
        }
        if (!u.password.equals(pwd)) {
            System.out.println("密码错误，请重新尝试");
            return;
        }    
        System.out.println("具体信息如下");
        System.out.println("账号:"+u.account+"	用户名:"+u.name+"	密码:"+u.password+"	身份证号是:"+u.idCard+"	账户余额:"+u.money);
    }

    /**
     * 转账;;;
     * 判断两次账号是否存在！！！
     */
    
    private void MoveMoney() {
        // TODO Auto-generated method stub
        System.out.println("请输入账号:");
        String zhang=input.next();
        System.out.println("请输入密码:");
        String pwd=input.next();
        chengyuan u=GetUser(zhang);
        if (u==null) {
            System.out.println("库中无该账户");
            return;
        }
        if (!u.password.equals(pwd)) {
            System.out.println("密码错误，请重新尝试");
            return;
        }
        System.out.println("账户登录成功！");
        System.out.println();                //换行
        System.out.println("请输入要转入的账号");
        String zhang_move=input.next();
        chengyuan u_move=GetUser(zhang_move);
        if (u_move==null) {
            System.out.println("该账户不存在！！请确认后重新尝试！！！");
        }
        System.out.print("请输入转账的金额:");
        int money=input.nextInt();
        if (u.money<money) {
            System.out.println("该账户余额不足！无法进行转账！！");
            return;
        }
        u.money-=money;
        u_move.money+=money;
        System.out.println(zhang+"转账成功！！当前余额为"+u.money);
    }

    /**
     * 取款
     * 接收输入值
     * 注意点：字符串的比较
     */
    private void OutMoney() {
        // TODO Auto-generated method stub
        System.out.println("请输入账号:");
        String zhang=input.next();
        System.out.println("请输入密码:");
        String pwd=input.next();
        chengyuan u=GetUser(zhang);
        if (u==null) {
            System.out.println("库中无该账户");
            return;
        }
        if (!u.password.equals(pwd)) {
            System.out.println("密码错误，请重新尝试");
            return;
        }
        System.out.print("请输入取款金额:");
        int money=input.nextInt();
        if (u.money<money) {
            System.out.println("账户的余额不足！！！");
            return;
        }
        u.money-=money;
        System.out.println(zhang+"账号取款成功,当前余额为:"+u.money);
        
    }

    /**
     * 存款
     * 验证
     * 对值进行修改
     */
    private void SaveMoney() {
        //chengyuan u=new chengyuan();
        // TODO Auto-generated method stub
        System.out.println("请输入账号:");
        String zhang=input.next();
        System.out.println("请输入密码:");
        String pwd=input.next();
        chengyuan u=GetUser(zhang);
        if (u==null) {
            System.out.println("库中无该账户");
            return;
        }
        if (!u.password.equals(pwd)) {
            System.out.println("密码错误，请重新尝试");
            return;
        }
        System.out.print("请输入存款金额:");
        int money=input.nextInt();
        u.money+=money;
        System.out.println(zhang+"账号存款成功,当前余额为:"+u.money);
        
    }
    
    
    //写一个返回用户对象的函数                  
    private chengyuan GetUser(String zhang) {
        // TODO Auto-generated method stub
        chengyuan u=new chengyuan();
//        for (int i = 0; i < users.length; i++) {
//            if (users[i].account.equals(zhang)) {
//                u=users[i];
//                
//            }else if(i==users.length-1){
//                
//                break;
//            }
//            
//        }
        u=null;
        for (chengyuan sui : users) {
            if (sui !=null) {
                if (sui.account.equals(zhang)) {
                    u=sui;
                    break;
                }
            }
        }
        return u;
    }


    
    
    
    

    /**
     * 显示所有信息
     * 循环
     */
private void ShowInfo() {
        // TODO Auto-generated method stub
        for (int i = 0; i < this.users.length; i++) {
            if(users[i]!=null){
            System.out.println("账号:"+users[i].account+"	用户名:"+users[i].name+"	密码:"+users[i].password+"	身份证号是:"+users[i].idCard+"	账户余额:"+users[i].money);
        }else {
            break;
        }
    }
}
//----------------

    /**
     * 增加用户
     * 接收输入语句
     * 先在对象数组中找到空
     * 在空中赋值
     */
    private void CreatUsers() {
        // TODO Auto-generated method stub
        chengyuan u=new chengyuan();
        System.out.print("请输入姓名:");
        String name1=input.next();
        System.out.print("请输入密码:");
        String pwd_1=input.next();
        System.out.print("请再次输入密码:");
        String pwd_2=input.next();
        System.out.print("请输入身份证号:");
        String cardno=input.next();
        System.out.print("请输入开户金额:");
        int qian=input.nextInt();
        String acc="1010"+(int)(Math.random()*10000);
        if(PwdSame(pwd_1,pwd_2)){
        System.out.println("
开户成功，开户信息如下:");
        System.out.println("账号:"+acc+"	用户名:"+name1+"	密码:"+pwd_1+"	身份证号是:"+cardno+"	账户余额:"+qian);
        for (int i = 0; i < users.length; i++) {        //找到空位，赋值
            if(users[i]==null){                        
                u.account=acc;
                u.name=name1;
                u.idCard=cardno;
                u.money=qian;
                u.password=pwd_1;
                users[i]=u;
                return;
            }
        }
        }else {
            System.out.println("两次密码输入不一致，请重新尝试！");
            return;
        }
    }
    
    /**
     * 判断两次密码是否一致的类,返回布尔型
     */
    public boolean PwdSame(String pwd_1,String pwd_2 ){
        return pwd_1.equals(pwd_2);
    }
}

仅供参考，无需同意，随意转载。