Java如何實(shí)現(xiàn)抽獎(jiǎng)系統(tǒng)

package cn.jbit.dlc1;

import java.util.Scanner;

public class LuckyNumber5 {

 /**
  * 幸運(yùn)抽獎(jiǎng)
  */
 public static void main(String[] args) {
  String answer = "y"; // 標(biāo)識(shí)是否繼續(xù)
  String userName = ""; // 用戶(hù)名
  String password = ""; // 密碼
  int cardNumber = 0; // 卡號(hào)
  boolean isRegister = false; // 標(biāo)識(shí)是否注冊(cè)
  boolean isLogin = false; // 標(biāo)識(shí)是否登錄
  int max = 9999;
  int min = 1000;
  Scanner input = new Scanner(System.in);

  do {
   System.out.println("*****歡迎進(jìn)入獎(jiǎng)客富翁系統(tǒng)*****");
   System.out.println("\t1.注冊(cè)");
   System.out.println("\t2.登錄");
   System.out.println("\t3.抽獎(jiǎng)");
   System.out.println("***************************");
   System.out.print("請(qǐng)選擇菜單：");
   int choice = input.nextInt();
   switch (choice) {
   case 1:
    System.out.println("[獎(jiǎng)客富翁系統(tǒng) > 注冊(cè)]");
    System.out.println("請(qǐng)?zhí)顚?xiě)個(gè)人注冊(cè)信息：");
    System.out.print("用戶(hù)名：");
    userName = input.next();
    System.out.print("密碼：");
    password = input.next();
    // 獲取4位隨機(jī)數(shù)作為卡號(hào)
    cardNumber = (int)(Math.random()*(max-min))+min;
    System.out.println("\n注冊(cè)成功，請(qǐng)記好您的會(huì)員卡號(hào)");
    System.out.println("用戶(hù)名\t密碼\t會(huì)員卡號(hào)");
    System.out.println(userName + "\t" + password + "\t" + cardNumber);
    isRegister = true; // 注冊(cè)成功，標(biāo)志位設(shè)置為true
    break;
   case 2:
    System.out.println("[獎(jiǎng)客富翁系統(tǒng) > 登錄](méi)");
    if (isRegister) { // 判斷是否注冊(cè)
     // 3次輸入機(jī)會(huì)
     for (int i = 1; i <= 3; i++) {
      System.out.print("請(qǐng)輸入用戶(hù)名：");
      String inputName = input.next();
      System.out.print("請(qǐng)輸入密碼：");
      String inputPassword = input.next();
      if (userName.equals(inputName) && password.equals(inputPassword)) {
       System.out.println("\n歡迎您：" + userName);
       isLogin = true; // 登錄成功，標(biāo)志位設(shè)置為true
       break;
      } else if (i < 3) {
       System.out.println("用戶(hù)名或密碼錯(cuò)誤，還有" + (3 - i) + "次機(jī)會(huì)！");
      } else {
       System.out.println("您3次均輸入錯(cuò)誤！");
      }
     }
    } else {
     System.out.println("請(qǐng)先注冊(cè)，再登錄！");
    }
    break;
   case 3:
    System.out.println("[獎(jiǎng)客富翁系統(tǒng) > 抽獎(jiǎng)]");
    if (!isLogin) { // 判斷是否登錄
     System.out.println("請(qǐng)先登錄，再抽獎(jiǎng)！");
     System.out.println("繼續(xù)嗎？（y/n）");
     answer = input.next();
    } else {
     //生成5個(gè)4位隨機(jī)數(shù)字，并保存在數(shù)組中
     int[] luckynums = new int[5];
     for(int i = 0; i < luckynums.length; i++){
      luckynums[i] = (int)(Math.random()*(max-min))+min;
     }
     System.out.print("請(qǐng)輸入您的卡號(hào)：");
     int yourcard = input.nextInt();
     int i;
     System.out.print("\n本日的幸運(yùn)數(shù)字為：");
     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！您是本日的幸運(yùn)會(huì)員！");
       break;
      }
     }
     if (i == luckynums.length) {
      System.out.println("\n抱歉！您不是本日的幸運(yùn)會(huì)員！");
     }
    }
    break;
   default:
    System.out.println("[您的輸入有誤！]");
    break;
   }
   System.out.print("繼續(xù)嗎？（y/n）:");
   answer = input.next();
   System.out.println("");
  } while ("y".equals(answer));
  if ("n".equals(answer)) {
   System.out.println("系統(tǒng)退出，謝謝使用！");
  }
 }
}