`import java.util.Arrays;
import java.util.Scanner;

/**

• @Author：TJ

• @Version：1.0

• @Date：2022/4/30-17:15

• @Since:jdk1.8

• @Description:
  */
  public class Work {
  static String inputname, inputPswd;
  static String loginname, loginPswd;
  static Scanner scanner = new Scanner(System.in);
  static int luckNum, num1;
  static boolean flag;

  public static void reg() {
  System.out.println("请输入注册的账号");
  inputname = scanner.next();
  System.out.println("请输入注册的账号密码");
  inputPswd = scanner.next();
  System.out.println("注册成功！请记住你的密码");
  luckNum = (int) (Math.random() * 8999 + 1000);
  System.out.println("用户名" + "\t" + "密码" + "\t" + "会员卡号");
  System.out.println(inputname + "\t" + "\t" + " " + inputPswd + "\t" + "\t" + luckNum);

  }

  public static void login() {
  //先判断是否注册
  if (inputname == null) {
  System.out.println("你还未注册！");
  return;
  }
  boolean flag = true;
  int count = 3;
  while (flag) {
  System.out.println("请输入你的账号和密码");
  loginname = scanner.next();
  loginPswd = scanner.next();
  if (inputname.equals(loginname) && inputPswd.equals(loginPswd)) {
  System.out.println("登陆成功！");
  break;
  } else {
  System.out.println("登陆失败!你还有" + (count - 1) + "次机会");
  count--;
  if (count == 0) {
  System.out.println("次数用尽");
  return;
  }

       }
  
   }
  

  }

  public static void again() {
  String answer = "y";
  System.out.println("请选择是否继续？请按 y , 按n退出本系统");
  char a = scanner.next().charAt(0);

// switch (answer){
// case "y":
// break;
// case "n":
// System.out.println("谢谢使用！");
// return;
// }
if (a == 'y'||a=='Y') {
flag=true;
}else {
System.out.println("谢谢使用！");
return;
}
}

public static void menu() {
    System.out.println("***********欢迎进入奖客大富翁系统*************");
    flag = true;
    while (flag) {
        System.out.println("  ************************************");
        System.out.println("\t\t\t" + "1.注册账号");
        System.out.println("\t\t\t" + "2.登录账号");
        System.out.println("\t\t\t" + "3.超级抽奖");
        System.out.println("  ************************************");
        int choose = scanner.nextInt();
        switch (choose) {
            case 1:
                reg();
                flag = false;
                break;
            case 2:
                login();
                flag = false;
                break;
            case 3:
                luck();
                flag = false;
                break;
            default:
                System.out.println("选择有误，请重新选择");
                break;
        }
        again();
    }


}

public static void luck() {
    if (loginname == null) {
        System.out.println("你还未登录！");
        return;
    }
    //随机生成四个四位数作为当日幸运数字
    int[] luckDayNum = new int[5];
    for (int i = 0; i < luckDayNum.length; i++) {
        luckDayNum[i] = (int) ((Math.random() * 8999 + 1000));
    }

// boolean flag = true;
// while (flag) {
//判断用户输入的卡号和注册给的卡号是否一致
System.out.println("请输入您的卡号！");
num1 = scanner.nextInt();
if (num1 != luckNum) {
System.out.println("此数不是您的卡号！");
return;
// flag = true;
}
// break;
// }

// }
//判断用户是否是今日幸运客户
for (int i = 0; i < luckDayNum.length - 1; i++) {
if (luckDayNum[i] == num1) {
System.out.println("恭喜你！你中了十亿！");
break;
}
}
System.out.println("很抱歉，您不是我们的今日幸运会员！");
System.out.println("今日幸运数字是：" + Arrays.toString(luckDayNum));
}

public static void main(String[] args) {
    menu();
}

}`