Java模拟ATM机，供大家参考，具体内容如下

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*200.0package bank;//测试类public class Text { public static void main(String[] args){ Bank bank =new Bank(); User user = new User(); bank.welcome(user); }}

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