import java.io.IOException
import java.io.InputStreamReader
public class AccountDemo {
public static double MONEY = 0// 初始化金额是100元。
public static void main(String[] args) {
final String USER_NAME = "zhangsan"// 用户名
final String PASSWORD = "123456"// 密码
while (true) {
System.out.print("请输入用户名：")
String user_name = getString()
System.out.print("请输入密码：")
String password = getString()
if (user_name != null &&user_name.equals(USER_NAME)
&&password != null &&password.equals(PASSWORD)) {
System.out.println("登陆成功！你要干什么？")
while (true) {
System.out.println("1：存款")
System.out.println("2：取款")
System.out.println("3：查询余额")
System.out.println("q：退出程序")
System.out.print("请选择：")
String userIn = getString()
int in = 0
if (userIn != null &&userIn.equals("1")) {
in = Integer.parseInt(userIn)
} else if (userIn != null &&userIn.equals("2")) {
in = Integer.parseInt(userIn)
} else if (userIn != null &&userIn.equals("3")) {
in = Integer.parseInt(userIn)
} else if (userIn != null
&&userIn.trim().toUpperCase().equals("Q")) {
in = 4
} else {
System.out.println("你输入的指令不正确！请重新输入。")
continue
}
switch (in) {
case 1:
double add_money = 0
while (true) {
System.out.print("请输入你要存入的金额：")
try {
add_money = Double.parseDouble(getString())
} catch (Exception e) {
System.out.println("金额输入不正确！")
continue
}
break
}
MONEY += add_money
System.out.println("存入的金额是" + add_money
+ "\r\n请选择你要的 *** 作：")
break
case 2:
double money = 0
while (true) {
System.out.print("请输入你要取出的金额：")
try {
money = Double.parseDouble(getString())
} catch (Exception e) {
System.out.println("金额输入不正确！")
continue
}
if (money >MONEY) {
System.out.println("取出的金额大于现有存款，请重新输入要取出的金额！")
continue
}
break
}
MONEY -= money
System.out.println("取出的金额是" + money + "\r\n请选择你要的 *** 作：")
break
case 3:
System.out.println("你的余额是：" + MONEY + "\r\n请选择你要的 *** 作：")
break
case 4:
System.out.println("程序退出！")
return
}
}
} else {
System.out.println("错误：用户名与密码不匹配！\r\n")
System.out.println("按任意键:重新输入用户名和密码。")
System.out.println("q:退出程序。")
System.out.print("请选择:")
String in = getString()
if (in.trim().toUpperCase().equals("Q")) {
break
}
}
}
}
public static String getString() {
String str = null
BufferedReader br = new BufferedReader(new InputStreamReader(System.in))
try {
str = br.readLine()
} catch (IOException e) {
e.printStackTrace()
}
return str
}
}
private int balance = 0private String username = "A"
private String password = "B"
public void bank() {
Scanner scan = new Scanner(System.in)
String temp
while (true) {
System.out.println("输入账号：")
if (scan.hasNext()) {
temp = scan.next()
if (temp.equals(username)) {
break
} else {
System.out.println("输入错误")
}
}
}
while (true) {
System.out.println("输入密码：")
if (scan.hasNext()) {
temp = scan.next()
if (temp.equals(password)) {
break
} else {
System.out.println("输入错误")
}
}
}
System.out.println("登录成功")
while (true) {
System.out.println("输入 *** 作：")
if (scan.hasNext()) {
temp = scan.next()
switch (temp) {
case "存款":
int x = 0
while (true) {
System.out.println("输入存款金额：")
if (scan.hasNextInt()) {
x = scan.nextInt()
break
} else {
System.out.println("输入错误")
scan.next()
}
}
balance += x
break
case "取款":
int y = 0
while (true) {
System.out.println("输入取款金额：")
if (scan.hasNextInt()) {
y = scan.nextInt()
if (balance < y) {
System.out.println("余额不足")
continue
}
break
} else {
System.out.println("输入错误")
scan.next()
}
}
balance -= y
break
case "余额":
System.out.println("余额：" + balance)
break
case "终止":
System.exit(0)
default:
System.out.println("未知 *** 作")
}
}
}
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