银行取款系统Java代码 java银行取钱( 三 )


}
if (moneyMONEY) {
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请选择你要的操作:");
break;
case 3:
System.out.println("你的余额是:" + MONEY + "\r\n请选择你要的操作:");
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;
}
}
如何用Java编写模拟ATM取款机的程序import java.io.IOException;
/**
* 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机的操作
*/
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 = 0; icount; i++) {
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 = 0; icount2 - 1; i++) {
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 = 0; icount2 - 1; i++) {
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 = "";

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