给网友朋友们带来一篇Java相关的编程文章，网友阎卿蓉根据主题投稿了本篇教程内容，涉及到java、ATM机、Java ATM机相关内容，已被232网友关注，相关难点技巧可以阅读下方的电子资料。
Java ATM机
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*200.0
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);
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持码农之家。
