/**
* ATM机类
*
* 查看余额
*
* 取款
*
* 存款
*
* 退出系统
*
*
*
*/
public class ATM {
static double yue = 1200.00
public static void main(String[] arg) {
ATM localTest1 = new ATM()
localTest1.ATM_Operate()
}
/**
* ATM机的 *** 作
*/
private void ATM_Operate() {
System.out.println("欢迎使用中国工商银行ATM取款机")
System.out.println("1、查看余额 2、取款")
System.out.println("3、存款0、退出")
System.out.print("请输入您需要的服务:")
byte[] buffer = new byte[512]
try {
int count = System.in.read(buffer)// 返回实际读取的字节数
System.out.print("您输入的是:")
for (int i = 0i <counti++) {
System.out.print("" + (char) buffer[i])
}
if ((char) buffer[0] == '1') {
// 查看余额
System.out.println("您的余额是：￥" + yue + "元")
System.out.println()
ATM_Operate()
} else if ((char) buffer[0] == '2') {
// 取款
withdrawal()
System.out.println()
ATM_Operate()
} else if ((char) buffer[0] == '3') {
// 存款
deposit()
System.out.println()
ATM_Operate()
} else if ((char) buffer[0] == '0') {
// 退出
System.out.println("您已经成功退出系统，谢谢你的使用")
System.exit(0)
} else {
System.out.println("输入不合法，请重新输入")
System.out.println()
ATM_Operate()
}
} catch (IOException e) {
e.printStackTrace()
}
}
/**
* 取款
*
* @throws IOException
*/
private void withdrawal() throws IOException {
byte[] buffer = new byte[512]
System.out.print("请输入您要取出的金额:￥")
int count2 = System.in.read(buffer)// 返回实际读取的字节数
System.out.print("您输入的金额是:")
for (int i = 0i <count2 - 1i++) {
System.out.print("" + (char) buffer[i])
}
System.out.println()
// 字符0 ~ 9对应ASCII值48 ~ 57
boolean flag = false
for (int i = 0i <count2 - 1i++) {
if ((char) buffer[i] >47 &&(char) buffer[i] <58) {
if (i == count2 - 2) {
flag = true
}
} else {
// 输入的字符不是数值
System.out.println("输入不合法，请重新输入")
withdrawal()
break
}
}
System.out.println()
if (flag) {
System.out.print("您已成功取出￥:")
String num = ""
for (int i = 0i <count2 - 1i++) {
System.out.print("" + (char) buffer[i])
num += (char) buffer[i]
}
yue -= Double.valueOf(num)
System.out.print("，现在余额￥:" + yue)
}
}
/**
* 存款
*
* @throws IOException
*/
private void deposit() throws IOException {
byte[] buffer = new byte[512]
System.out.print("请输入您要存入的金额:￥")
int count2 = System.in.read(buffer)// 返回实际读取的字节数
System.out.print("您输入的金额是:")
for (int i = 0i <count2 - 1i++) {
System.out.print("" + (char) buffer[i])
}
System.out.println()
// 字符0 ~ 9对应ASCII值48 ~ 57
boolean flag = false
for (int i = 0i <count2 - 1i++) {
if ((char) buffer[i] >47 &&(char) buffer[i] <58) {
if (i == count2 - 2) {
flag = true
}
} else {
// 输入的字符不是数值
System.out.println("输入不合法，请重新输入")
withdrawal()
break
}
}
System.out.println()
if (flag) {
System.out.print("您已成功存入￥:")
String num = ""
for (int i = 0i <count2 - 1i++) {
System.out.print("" + (char) buffer[i])
num += (char) buffer[i]
}
yue += Double.valueOf(num)
System.out.print("，现在余额￥:" + yue)
}
}
}
我现写的： import java.util.Scannerpublic class ATM {
private static String theName = "admin"
private static String thePassword = "123456"
private static int balance = 10000
public static void getBalance(){
System.out.println("当前余额：" + balance)
}
public static void drawMoney(Scanner sc){
int money = 0
System.out.println("请输入取款金额：")
money = sc.nextInt()
String type = ""
if (balance >0) {
if (balance >= money) {
if (money <= 5000) {
balance = balance - money
type = "请在30秒内提取现金...\n剩余余额："+balance
} else if (money <= 0) {
type = "金额错误"
} else {
type = "超出最大限制金额"
}
} else {
type = "超出最大余额"
}
} else {
type = "余额不足"
}
System.out.println(type)
}
public static void bankMoney(Scanner sc){
int money = 0
System.out.println("请输入存储金额：")
money = sc.nextInt()
String type = ""
if (money >0) {
balance = balance + money
type = "存储成功，现有余额：" + balance
} else {
type = "存储金额不能为负"
}
System.out.println(type)
}
public static void updatePass(Scanner sc){
String oldPass = ""
String newPass1 = ""
String newPass2 = ""
while(true){
System.out.println("请输入原密码：")
oldPass = sc.next()
if (oldPass.equals(thePassword)) {
break
} else {
System.out.println("密码错误，请重新输入")
}
}
while(true){
System.out.println("请输入新密码")
newPass1 = sc.next()
System.out.println("再次输入")
newPass2 = sc.next()
if (newPass1.equals(newPass2)) {
if (!isSame(newPass1)) {
thePassword = newPass1
System.out.println("修改成功")
break
} else {
System.out.println("所有字符不能相同，重新输入")
}
} else {
System.out.println("两次输入不一致，重新输入")
}
}
}
public static boolean isSame(String string){
boolean bool = false
for (int i = 0i <string.length() - 1i++) {
char char1 = string.charAt(i)
for (int j = i + 1j <string.length()j++) {
char char2 = string.charAt(j)
if (char1 == char2) {
bool = true
break
}
}
}
return bool
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in)
while(true){
String name = ""
String password = ""
System.out.println("请输入账号：")
name = sc.next()
System.out.println("请输入密码：")
password = sc.next()
if (name.equals(theName) &&password.equals(thePassword)) {
break
} else {
System.out.println("账号或密码错误，请重新输入!")
}
}
while(true){
int operate = 0
System.out.println("请选择你要进行的 *** 作：\n1、查询 2、取款 3、存款 4、修改密码 0、退出")
operate = sc.nextInt()
if (0 == operate) {
System.out.println("谢谢使用！")
break
} else if (1 == operate) {
getBalance()
} else if (2 == operate) {
drawMoney(sc)
} else if (3 == operate) {
bankMoney(sc)
} else if (4 == operate) {
updatePass(sc)
}
}
}
}
很简单的例子，我把代码贴出来吧import java.util.Scanner
public class ATM {
/**
* @param args
*/
public static void main(String[] args) {
Scanner in = null
int result
double drawMoney
double depositMoney
Account account = new Account()
while (true) {
System.out.println("☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆(ABC)中国农业银行ATM自动存取款机☆☆☆☆☆☆☆☆☆☆☆☆☆")
System.out.println("\n\t\t\t\t1.存款业务")
System.out.println("\n\t\t\t\t2.取款业务")
System.out.println("\n\t\t\t\t3.查询余额")
System.out.println("\n\t\t\t\t4.退出ATM系统")
System.out.println("\n☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆中国农业银行欢迎您的使用☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆")
in = new Scanner(System.in)
switch (in.nextInt()) {
case 1:
System.out.println("请输入您的存款数额！")
depositMoney = in.nextDouble()
if(depositMoney <0)
System.out.println("您的输入无效，请重新输入!")
result = account.deposit(depositMoney)
if(result == 0){
System.out.println("存款业务完成，是否显示余额？Y/N")
if("Y".equalsIgnoreCase(in.next())){
System.out.println("您当前的余额为："+account.checkCurrent())
}else {
break
}
}else {
System.out.println("无法完成交易！")
break
}
break
case 2:
System.out.println("请输入您的取款数额！")
drawMoney = in.nextDouble()
if (drawMoney <0) {
System.out.println("您的输入无效，请重新输入!")
}
result = account.withDraw(drawMoney)
if (result == 0) {
System.out.println("存款业务完成，是否显示余额？Y/N")
if("Y".equalsIgnoreCase(in.next())){
System.out.println("您当前的余额为："+account.checkCurrent())
}else {
break
}
} else {
System.out.println("无法完成交易！")
break
}
case 3:
System.out.println("您当前的余额为："+account.checkCurrent())
break
case 4:
break
default:
break
}
}
}
}
public class Account {
private double currentMoney//当前余额
public double getCurrentMoney() {
return currentMoney
}
public void setCurrentMoney(double currentMoney) {
if (currentMoney >0) {
this.currentMoney = currentMoney
}
}
/**
* 取款业务
* @param drawMoney
* @return 0代表成功，1代表失败
*/
public int withDraw(double drawMoney) {
if (currentMoney >0 &&drawMoney <= currentMoney) {
currentMoney -= drawMoney
} else {
System.out.println("您的余额已不足！")
return 1
}
return 0
}
/**
* 存款业务
* @param depositMoney
* @return 0代表成功，1代表失败
*/
public int deposit(double depositMoney) {
if (depositMoney >0) {
currentMoney += depositMoney
return 0
}else {
System.out.println("您提交的存款为负数，无法完成存款交易")
return -1
}
}
/**
* 查询余额业务
* @return
*/
public double checkCurrent() {
return currentMoney
}
}
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