Java模拟ATM机

实现登录，查询，转账，取款，修改密码，退出功能。

源码

package bank;

import java.io.*;
import java.util.Scanner;

//ATM类
public class Atm {
    private String[] user;//用户全部信息
    private double money;//修改钱数
    private double userMoney;//用户的钱
    private String newPassword;
    private String userInFo;
    private int index;
    private int a =0;
    private int count = 10;

    public void show(){//显示界面
        index = logIn();
        if(index != -1){
            working();
        }
    }

    private String[] newStringUser(String[] str){
        count=count+10;
        String[] newUser = new String[count];
        for(int i=0;i<a;i++)
            newUser[i] = str[i];
        return newUser;
    }

    private void getUser(){//从文件获取全部用户
        String str;
        String[] strings = new String[count];
        File file = new File("src\\bank\\user");
        FileReader fileReader = null;
        BufferedReader bufferedReader = null;
        try{
            fileReader = new FileReader(file);
            bufferedReader = new BufferedReader(fileReader);
            while((str = bufferedReader.readLine())!=null){
                if(a<=count)
                    strings[a++] = str;
                else
                    strings = newStringUser(strings);
            }
            user = new String[a];
            for(int i=0;i<a;i++)
                user[i] = strings[i];
            strings = null;
        }catch(Exception e){
            e.printStackTrace();
            if((fileReader!=null)&&(bufferedReader!=null)){
                try {
                    bufferedReader.close();
                    fileReader.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
    }

    private int logIn(){//用户登录
        getUser();
        String name,password,user;
        String[] a;
        int i = 0;
        int number = -1;
        Scanner input = new Scanner(System.in);
        a:while(i<3){
            System.out.println("请输入用户名：");
            name = input.nextLine();
            System.out.println("请输入用户密码：");
            password = input.nextLine();
            user = name + "*" + password;
            for(int j=0;j<this.user.length;j++){
                a = this.user[j].split("\\*");
                userInFo = a[0]+"*"+a[1];
                if(userInFo.equals(user)){
                    number = j;
                    break a;
                }
            }
            i++;
            System.out.println("账户或密码错误请重新输入。。。");
        }
        if(number!=-1){
            System.out.println("登录成功");
            try{
                Thread.sleep(1000);
            }catch(Exception e){
                e.printStackTrace();
            }
        }
        else
            System.out.println("您已输入错误三次，卡已被吞！请到银行柜台询问！");
        return number;
    }

    private int anthorLogin(){//查询转账用户是否存在
        Scanner input = new Scanner(System.in);
        String antherUserName;
        String[] a;
        int x=-1;
        System.out.println("请输入要转账的用户名：");
        antherUserName = input.nextLine();
        for(int i=0;i<user.length;i++){
            a = this.user[i].split("\\*");
            if(a[0].equals(antherUserName)){
                x=i;
                break;
            }
        }
        return x;
    }

    private void show1(){
        System.out.println("**********************");
        System.out.println("\t欢迎使用ATM");
        System.out.println("1，账户余额查询\n2，存钱\n3，取钱\n4，转账\n5，修改用户密码\n6，退出系统\n");
        System.out.println("**********************");
    }

    private void changeUser(int x){//改变用户数组里的数据
        String[] str = user[index].split("\\*");
        if(x==1)
            user[index] = str[0]+"*"+newPassword+"*"+str[2];
        else
            user[index] = str[0]+"*"+str[1]+"*"+userMoney;
    }

    private void working(){//atm办理的业务
        String number;
        setMoney();
        do{
            show1();
            System.out.println("请输入要办理的业务序号：");
            Scanner input = new Scanner(System.in);
            number = input.nextLine();
            switch(number){
                case "1":
                    look();
                    break;
                case "2":
                    saveMoney();
                    break;
                case "3":
                    getMoney();
                    break;
                case "4":
                    giveMoney();
                    break;
                case "5":
                    changePassword();
                    break;
                case "6":
                    System.out.println("欢迎下次光临！");
                    write();
                    break;
                default:
                    System.out.println("您输入有误，请重新输入。。。。");
            }
        }while(!number.equals("6"));
    }

    private void setMoney(){
        String u = user[index];
        userMoney = Double.parseDouble(u.split("\\*")[2]);
    }

    private void look(){//办理查看余额业务
        System.out.println("用户余额为："+userMoney);
        try{
            Thread.sleep(2000);
        }catch(Exception e){
            e.printStackTrace();
        }
    }

    private void saveMoney(){//办理存钱业务
        money = howMuch("存钱");
        userMoney = userMoney+money;
        changeUser(2);
        look();
        if(isContinue())
            saveMoney();
    }

    private void getMoney(){//办理取钱业务
        money = howMuch("取钱");
        if(money <= userMoney){
            userMoney = userMoney-money;
            changeUser(2);
            look();
            if(isContinue())
                getMoney();
        }
        else
            System.out.println("您的余额不足！");
    }

    private void giveMoney(){//办理转账业务
        int anthorIndex = anthorLogin();
        if(anthorIndex!=-1){
            money = howMuch("转账");
            if(money <= userMoney){
                userMoney = userMoney - money;
                changeUser(2);
                String anthorUser = user[anthorIndex];
                String[] str =anthorUser.split("\\*");
                double money1 = Double.parseDouble(str[2]);
                money = money + money1;
                user[anthorIndex] = str[0]+"*"+str[1]+"*"+money;
                System.out.println("转账成功！");
                look();
            }
            else
                System.out.println("您的余额不足！");
        }
        else
            System.out.println("该用户不存在。。。。");
    }

    private double howMuch(String str){
        System.out.println("欢迎办理"+str+"业务。。。。。。");
        System.out.println("请输入金额(只能是整数且是100的倍数，最多为10000)：");
        Scanner input = new Scanner(System.in);
        double money = input.nextDouble();
        if(money%10==0)
            return money;
        else{
            System.out.println("您输入有误！");
            return 0.0;
        }
    }

    private void changePassword(){//办理修改密码业务
        System.out.println("请输入新密码：");
        Scanner input = new Scanner(System.in);
        newPassword = input.nextLine();
        changeUser(1);
        System.out.println("密码修改成功！");
    }

    private boolean isContinue(){
        System.out.println("是否继续办理该项业务？(请输入Y(y)/N(n))");
        Scanner input = new Scanner(System.in);
        String str = input.nextLine();
        if(str.equalsIgnoreCase("y"))
            return true;
        else
            return false;
    }

    private void write(){
        String str = "";
        String s;
        for(int i=0;i<user.length;i++){
            s = user[i];
            if(i!=user.length-1)
                str = str + s + "\n";
            else
                str = str + s;
        }
        File file = new File("src\\bank\\user");
        FileWriter out = null;
        try {
            out = new FileWriter(file);
            out.write(str);
            out.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            if(out != null){
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

package bank;

//银行类
public class Bank {

    private Atm atm = new Atm();

    public void welcome(User user){
        System.out.println("欢迎使用atm");
        user.useAtm(atm);
    }

}

package bank;

//用户类
public class User {

    public void useAtm(Atm atm){
        atm.show();
    }
}

//创建user文件当数据库
张三*456*100.0
李四*123*300.0
王五*789*200.0

package bank;

//测试类
public class Text {
    public static void main(String[] args){
        Bank bank =new Bank();
        User user = new User();
        bank.welcome(user);
    }
}

本文地址：https://blog.csdn.net/weixin_46085748/article/details/112017717