ATM机系统：
package pro0624;
import java.util.Scanner;
public class ATM {
int 密码 = 123456;
double 余额 = 7963.2;
String log = "";
Scanner in = new Scanner(System.in);
public void 输入密码(int count) {
System.out.print("请输入密码:");
int pass = in.nextInt();
if (pass == 密码) {
this.主界面();
} else {
count--;
if (count == 0) {
System.out.println("吞卡!");
} else {
log+="密码输入第"+(3-count)+"次错误\n";
System.out.println("密码输入错误,你还有" + count + "次机会");
this.输入密码(count);
}
}
}
public void 主界面() {
System.out.println("***********************************************");
System.out.println("**********欢迎来到中国XX银行ATM机***************");
System.out.println("***********************************************");
System.out.println("请选择操作:");
System.out.println("1.取款");
System.out.println("2.存款");
System.out.println("3.查询");
System.out.println("4.改密");
System.out.println("5.退出");
int ask = in.nextInt();
switch (ask) {
case 1:
取款();
break;
case 2:
存款();
break;
case 3:
查询();
break;
case 4:
改密();
break;
case 5:
退出();
break;
default:
break;
}
}
public void 查询() {
System.out.println("你的余额为:" + 余额 + "元");
主界面();
}
public void 退出(){
System.out.println(log);
System.out.println("请带好你的卡和钱!再见!");
}
public void 取款() {
System.out.println("请输入取款金额:");
int money = in.nextInt();
if (money % 100 != 0) {
System.out.println("本机仅支持100面值!");
System.out.println("请选择:\n1.继续取款\n2.返回主界面\n3.退出");
int ask = in.nextInt();
if (1 == ask) {
取款();
} else if (2 == ask) {
主界面();
} else if (3 == ask) {
退出();
}
} else if (money > 余额 - 1) {
System.out.println("余额不足!");
System.out.println("请选择:\n1.继续取款\n2.返回主界面\n3.退出");
int ask = in.nextInt();
if (1 == ask) {
取款();
} else if (2 == ask) {
主界面();
} else if (3 == ask) {
退出();
}
} else if (money > 3000) {
System.out.println("超出单次最大额度!");
System.out.println("请选择:\n1.继续取款\n2.返回主界面\n3.退出");
int ask = in.nextInt();
if (1 == ask) {
取款();
} else if (2 == ask) {
主界面();
} else if (3 == ask) {
退出();
}
} else {
log+="取款成功!本次取出" + money + "元\n";
System.out.println("取款成功!本次取出" + money + "元");
余额 -= money;
System.out.println("请选择:\n1.继续取款\n2.返回主界面\n3.退出");
int ask = in.nextInt();
if (1 == ask) {
取款();
} else if (2 == ask) {
主界面();
} else if (3 == ask) {
退出();
}
}
}
public void 存款() {
System.out.print("请输入存款金额:");
int money = in.nextInt();
if (money % 100 != 0) {
System.out.println("本机仅支持100面值!");
System.out.println("请选择:\n1.继续存款\n2.返回主界面\n3.退出");
int ask = in.nextInt();
if (1 == ask) {
存款();
} else if (2 == ask) {
主界面();
} else if (3 == ask) {
退出();
}
} else {
log+="本次存入" + money + "元\n";
System.out.println("本次存入" + money + "元");
余额 += money;
System.out.println("请选择:\n1.继续存款\n2.返回主界面\n3.退出");
int ask = in.nextInt();
if (1 == ask) {
存款();
} else if (2 == ask) {
主界面();
} else if (3 == ask) {
退出();
}
}
}
public void 改密() {
System.out.print("请输入新密码:");
int pass1 = in.nextInt();
System.out.print("请再次输入新密码:");
int pass2 = in.nextInt();
if (pass1 == pass2) {
密码 = pass1;
log+="修改密码成功!\n";
System.out.println("修改成功!");
输入密码(3);
} else {
System.out.println("两次修改不一致!");
改密();
}
}
public static void main(String[] args) {
new ATM().输入密码(3);
}
}