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; i < count; 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; i < count2 - 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; i < count2 - 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 = "";

for (int i = 0; i < count2 - 1; i++) {

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 = 0; i < count2 - 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; i < count2 - 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("您已成功存入￥:");

String num = "";

for (int i = 0; i < count2 - 1; i++) {

System.out.print("" + (char) buffer[i]);

num += (char) buffer[i];

}

yue += Double.valueOf(num);

System.out.print("，现在余额￥:" + yue);

}

}

}

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