基于Java实现抽奖系统

package cn.jbit.dlc1;import java.util.Scanner;public class LuckyNumber5 {  /**   * 幸运抽奖   */  public static void main(String[] args) {    String answer = "y"; // 标识是否继续    String userName = ""; // 用户名    String password = ""; // 密码    int cardNumber = 0; // 卡号    boolean isRegister = false; // 标识是否注册    boolean isLogin = false; // 标识是否登录    int max = 9999;    int min = 1000;    Scanner input = new Scanner(System.in);    do {      System.out.println("*****欢迎进入奖客富翁系统*****");      System.out.println("/t1.注册");      System.out.println("/t2.登录");      System.out.println("/t3.抽奖");      System.out.println("***************************");      System.out.print("请选择菜单：");      int choice = input.nextInt();      switch (choice) {      case 1:        System.out.println("[奖客富翁系统 > 注册]");        System.out.println("请填写个人注册信息：");        System.out.print("用户名：");        userName = input.next();        System.out.print("密码：");        password = input.next();        // 获取4位随机数作为卡号        cardNumber = (int)(Math.random()*(max-min))+min;        System.out.println("/n注册成功，请记好您的会员卡号");        System.out.println("用户名/t密码/t会员卡号");        System.out.println(userName + "/t" + password + "/t" + cardNumber);        isRegister = true; // 注册成功，标志位设置为true        break;      case 2:        System.out.println("[奖客富翁系统 > 登录]");        if (isRegister) { // 判断是否注册          // 3次输入机会          for (int i = 1; i <= 3; i++) {            System.out.print("请输入用户名：");            String inputName = input.next();            System.out.print("请输入密码：");            String inputPassword = input.next();            if (userName.equals(inputName) && password.equals(inputPassword)) {              System.out.println("/n欢迎您：" + userName);              isLogin = true; // 登录成功，标志位设置为true              break;            } else if (i < 3) {              System.out.println("用户名或密码错误，还有" + (3 - i) + "次机会！");            } else {              System.out.println("您3次均输入错误！");            }          }        } else {          System.out.println("请先注册，再登录！");        }        break;      case 3:        System.out.println("[奖客富翁系统 > 抽奖]");        if (!isLogin) { // 判断是否登录          System.out.println("请先登录，再抽奖！");          System.out.println("继续吗？（y/n）");          answer = input.next();        } else {          //生成5个4位随机数字，并保存在数组中          int[] luckynums = new int[5];          for(int i = 0; i < luckynums.length; i++){            luckynums[i] = (int)(Math.random()*(max-min))+min;          }          System.out.print("请输入您的卡号：");          int yourcard = input.nextInt();          int i;          System.out.print("/n本日的幸运数字为：");          for (i = 0; i < luckynums.length; i++) {            System.out.print(luckynums[i] + " ");          }          for (i = 0; i < luckynums.length; i++) {            if (luckynums[i] == yourcard) {              System.out.println("/n恭喜！您是本日的幸运会员！");              break;            }          }          if (i == luckynums.length) {            System.out.println("/n抱歉！您不是本日的幸运会员！");          }        }        break;      default:        System.out.println("[您的输入有误！]");        break;      }      System.out.print("继续吗？（y/n）:");      answer = input.next();      System.out.println("");    } while ("y".equals(answer));    if ("n".equals(answer)) {      System.out.println("系统退出，谢谢使用！");    }  }}