Java实现多用户注册登录的幸运抽奖

package test1;

public class User {
 private String userName;
 private String password;
 private int vipID;
 
 public User(String userName,String password,int vipID) {
 this.userName = userName;
 this.password = password;
 this.vipID = vipID;
 }
 
 public String getUserName() {
 return userName;
 }
 public void setUserName(String userName) {
 this.userName = userName;
 }
 public String getPassword() {
 return password;
 }
 public void setPassword(String password) {
 this.password = password;
 }
 public int getVipID() {
 return vipID;
 }
 public void setVipID(int vipID) {
 this.vipID = vipID;
 }
}

package test1;

import java.util.ArrayList;
import java.util.Random;

import java.util.Scanner;


public class TestUser {

 private static Scanner in;
 public static void main(String[] args) {
 // TODO Auto-generated method stub
 ArrayList<User> user = new ArrayList<User>();
 User u = null;
 String conf = null;
 String userName = null;
 String userPassword = null;
 String n;
 boolean flag = false;
 boolean flag0 = false;
 int[][] a = new int[2][5];
 in = new Scanner(System.in);
 for(int i=0;i<2;i++) {
  for(int j=0;j<5;j++) {
  Random rand = new Random();
  a[i][j] = rand .nextInt(9999) + 1000;
  }
 }
 do {
  
  System.out.println("****************欢迎进入奖客富翁系统*******************");
  System.out.println("                                 1、注册");
  System.out.println("                                 2、登录");
  System.out.println("                                 3、抽奖");
  System.out.println("*******************************************************");
  
  
  System.out.print("请选择菜单:"); 

   n = in.next();
   
  switch(n) {
   //用户注册
   case "1": {
   userName = null;
   userPassword = null;
   System.out.println("(奖客富翁系统 >注册):");
   System.out.print("用户名：");
   String name = in.next();
   System.out.print("密 码：");
   String password = in.next();
   System.out.print("确认密码：");
   String rePassword = in.next();
   if(password.equals(rePassword)) {
    Random rand = new Random();
    int randNumber = rand .nextInt(9000) + 1000;
    u = new User(name,password,randNumber);
    user.add(u);
    System.out.println("注册成功，请记住您的会员卡号:");
    System.out.println("用户名        密码       会员卡号");
    System.out.println(u.getUserName()+"      "+u.getPassword()+"      "+u.getVipID());
   }
   else {
    System.out.println("对不起，您输入的密码不一致！");
   }
   
   System.out.print("\n继续吗？y/n：");
   
   String confirm = null;
   boolean fir = false;
   while(fir == false) {
    confirm = in.next();
    if(confirm.equals("Y")||confirm.equals("y")||confirm.equals("N")||confirm.equals("n")) {
    fir = true;
    break;
    }
    else {
    System.out.print("您的输入为非法输入，请重新输入:");
    fir = false;
    }
   }
   
   conf = confirm;
   if(conf.equals("n")||conf.equals("N")) {
    System.out.println("系统退出，谢谢使用！");
   }
   }
   break;
   //用户登录
   case "2": {
   String eName = null;
   String ePassword = null;
   userName = null;
   userPassword = null;
   boolean fla = false;
   int eVipID = 0;
   System.out.println("(奖客富翁系统 >登录):");
   while(fla == false){
    System.out.print("用户名：");
    userName = in.next();
    System.out.print("密 码：");
    userPassword = in.next();
    if(user.isEmpty()) {
    System.out.println("您还没有注册，请先注册！");
    flag0 = true;
    fla = true;
    }else {
    for(User e: user) {
     if(userName.equals(e.getUserName())) {
     if(userName.equals(e.getUserName())&&userPassword.equals(e.getPassword())) { 
      
      eName = e.getUserName();
      ePassword = e.getPassword();
      eVipID = e.getVipID();
      fla = true;
      System.out.println("欢迎您："+eName);
      
     }else {
      System.out.println("您输入的账号或密码有误，请重新输入:");
     }
     flag0 = true;
     break;
     }

    }
    
    if(flag0 == false) {
     System.out.println("您还没有注册，请先注册！");
    }
    
    }
    
   }
   
   if(flag0 == true) {
    
    System.out.print("继续吗？y/n：");
    String confirm = in.next();
    conf = confirm;
    if(conf.equals("Y")||conf.equals("y")) {
    u= new User(eName,ePassword,eVipID);
    }
    else if(conf.equals("n")||conf.equals("N")) {
    System.out.println("系统退出，谢谢使用！");
    }
   }else {
    String confirm = null;
    boolean fir = false;
    while(fir == false) {
    confirm = in.next();
    if(confirm.equals("Y")||confirm.equals("y")||confirm.equals("N")||confirm.equals("n")) {
     fir = true;
     break;
    }
    else {
     System.out.print("您的输入为非法输入，请重新输入:");
    }
    }
    conf = confirm;
    if(conf.equals("n")||conf.equals("N")) {
    System.out.println("系统退出，谢谢使用！");
    }
   }
   
   }
   break;
   //抽奖
   case "3": {
   System.out.println("(奖客富翁系统 >抽奖):");
   
   if(u == null||(userName==null&&userPassword==null)){
    System.out.println("您还没有登录，请重新登录！");
    System.out.print("继续吗？y/n：");
    String confirm = null;
    boolean fir = false;
    while(fir == false) {
    confirm = in.next();
    if(confirm.equals("Y")||confirm.equals("y")||confirm.equals("N")||confirm.equals("n")) {
     fir = true;
     break;
    }
    else {
     System.out.print("您的输入为非法输入，请重新输入:");
     fir = false;
    }
    }
    conf = confirm;
    if(conf.equals("n")||conf.equals("N"))
    System.out.println("系统退出，谢谢使用！");
   }

   else{
    System.out.println("欢迎"+u.getUserName()+"来到幸运抽奖！");
    System.out.println("您的会员卡号为："+u.getVipID());
    for(int i=0;i<2;i++) {
    for(int j=0;j<5;j++) {
     System.out.print(a[i][j]+" ");
     if(u.getVipID() == a[i][j]) {
     flag = true;
     break;
     }else {
     flag=false;
     }
    }
    if(flag == true)
     break;
    }
    if(flag == true) {
    System.out.println("\n恭喜你成为本日的幸运会员！");
    }
    else {
    System.out.println("\n抱歉，您不是本日的幸运会员！");
    }
    System.out.print("继续吗？y/n：");
    String confirm = null;
    boolean fir = false;
    while(fir == false) {
    confirm = in.next();
    if(confirm.equals("Y")||confirm.equals("y")||confirm.equals("N")||confirm.equals("n")) {
     fir = true;
     break;
    }
    else {
     System.out.print("您的输入为非法输入，请重新输入:");
     fir = false;
    }
    }
    conf = confirm;
    if(conf.equals("n")||conf.equals("N"))
    System.out.println("系统退出，谢谢使用！");
   }
   
   break;
   }
   
   default:{
   System.out.println("您的输入为非法输入，请重新输入:");
   System.out.print("继续吗？y/n：");
   String confirm = null;
   boolean fir = false;
   while(fir == false) {
    confirm = in.next();
    if(confirm.equals("Y")||confirm.equals("y")||confirm.equals("N")||confirm.equals("n")) {
    fir = true;
    break;
    }
    else {
    System.out.print("您的输入为非法输入，请重新输入:");
    fir = false;
    }
   }
   conf = confirm;
   if(conf.equals("n")||conf.equals("N"))
    System.out.println("系统退出，谢谢使用！");
   break;
   
   }
  }
  
 }while((conf.equals("Y")||conf.equals("y"))&&(!(n.equals("1"))||!(n.equals("2"))||!(n.equals("3"))));
 }
}