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+"\t用户名:"+u.name+"\t密码:"+u.password+"\t身份证号是:"+u.idCard+"\t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+"\t用户名:"+users[i].name+"\t密码:"+users[i].password+"\t身份证号是:"+users[i].idCard+"\t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("\n开户成功，开户信息如下:");
         System.out.println("账号:"+acc+"\t用户名:"+name1+"\t密码:"+pwd_1+"\t身份证号是:"+cardno+"\t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。