Java Raffle System (with full code)

Many big companies will draw year-end prizes at their annual meetings to reward them for what they pay each year, do you know how to use JAVA as a raffle system? Editor to tell you.

A needs analysis of the raffle system

1) The three main functions of realizing the raffle system are login, registration and sweepstakes.

2) Login requirements refer to allowing users to enter their account password to log in, users enter their account to match the registered users in the system, if the input account does not exist to exit, password can be entered three times, after successful login the main interface will show the logged-in user's account information.

3) Registration requirements allow users to enter their account numbers first, and then have a system to query whether the user account name already exists, if it already exists to allow users to re-enter, there is no need to enter the next password, password requirements are 6 digit string, user registration success after the system will be randomly assigned with the existing account is not the same four digits id number.

4) The raffle requirements function is implemented as a prerequisite for having a user in the signed-in state. At the time of the current mention satisfaction, the system randomly selects 5 different users from existing users to mark as lucky users, and then then determines whether the online users are being pumped at this time.

5) Data storage is a file system, imported java.io.

6) Login user information is saved in ArrayList, lucky user number and id are saved in HasMap<String id,String name> of length 5, String name > where its id is Key and name is Value.

The result is achieved

1) Sign in:

2) Register:

3) Draw:

Precautions

Be sure to create more than five users in user .txt before running your code.

The full code

import java.util.Scanner;
import java.util.ArrayList;
import java.io.*;
import java.util.StringTokenizer;

public class Dos {
    static boolean logined=false;
    public static void main(String[] args) {
        User user=new User();
        int k=0;
        while( (k=Main(user))>=1&&k<5){
            switch (k){
                case 1:
                    System.out.print((k=user.login(user))==-1?"此用户不存在!\n":"");
                    System.out.print((k==-2)?"===<<警告>>用户：["+user.userName+"]已处于登录状态，无需重复登录！\n":"");
                    break;
                case 2:
                    user.regist();
                    break;
                case 3:
                    user.getLuckly();
                    break;
                default:System.exit(0);
            }
        }
    }
    static int Main(User user){
        System.out.println("**********************************************");
        System.out.println("********************主菜单********************");
        System.out.println("**********************************************");
        System.out.println("******          <1> 登   录             ******");
        System.out.println("******          <2> 注   册             ******");
        System.out.println("******          <3> 抽   奖             ******");
        System.out.println("******          <4> 退   出             ******");
        System.out.println("**********************************************");
        System.out.println("==============================================");
        System.out.println(logined ? "-[已登录]-  （1）用户名:"+user.userName+"   （2）用户账号:"+user.userId:"-[未登录]-   （1）用户名:NaN   （2）用户账号:NaN");
        System.out.println("==============================================");
        System.out.print("###===>请输入您的选择：");
        return (new Scanner(System.in)).nextInt();
    }
}
public class User{
    String userName,userId,userPwd;
    public User(){}
    public User(String userName, String userId, String userPwd) {
        this.userName = userName;
        this.userId = userId;
        this.userPwd = userPwd;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        if(!userName.equals("")) {
            ArrayList<String> temp;
            this.userId=(temp=(new operatorFile(this.userName = userName)).getUserMess(0)).get(1);
            this.userPwd=temp.get(2);
        }
    }
    public String getUserId() {
        return userId;
    }
    public String setUserId() {
        String userId="";
        while((new operatorFile(userId=String.valueOf ((int) (Math.random()*9000+1000)))).getUserMess(1).size()>0){ }
        return (this.userId = userId);
    }
    public String getUserPwd() {
        return userPwd;
    }
    public int login(User u) {
        int inputTimes=3;
        Scanner scanner=new Scanner(System.in);
        operatorFile getUserMessage=new operatorFile();
        System.out.print("======>请输入您的用户名：");
        String uName="";
        getUserMessage.setUser(uName=scanner.nextLine());
        ArrayList<String> userMess=getUserMessage.getUserMess(0);
        if(userMess.size()<1)       return -1;//返回-1表示用户不存在
        if (uName.equals(userName))     return -2;//返回-2表示用户重复登录
        System.out.print("======>请输入您的登录密码：");
        while(!scanner.next().equals(userMess.get(2))&&inputTimes>0)
            System.out.print("===>密码输入错误！"+((--inputTimes)>0?"您还剩"+inputTimes+"次机会！":"三次机会已经用完了！输入任意退出"));
        System.out.println(inputTimes>0?"==>登录成功！您本次输入密码"+(4-inputTimes)+"次！":"==>登录失败！");
        setUserName(inputTimes>0?uName:"");
        Dos.logined=inputTimes>0?true:false;
        return 0;
    }
    public void regist() {
        User u=new User();
        Scanner scanner=new Scanner(System.in);
        System.out.print("===>请输入新的用户名：");
        String name;
        while(new operatorFile(name=scanner.nextLine()).getUserMess(0).size() > 0)
            System.out.print("已存在此用户,注册失败！\n===>请重新输入新的用户名：");
        System.out.print("======>请设置您的(六位数字)登录密码：");
        String regex = "[0-9]{6}", pwd;
        while (!(pwd = scanner.nextLine()).matches(regex))
            System.out.print("==>密码格式不正确，请重新设置您的(六位数字)登录密码：");
        System.out.println("已为用户："+(u.userName=name)+" 生成唯一ID: "+(u.userPwd=pwd));
        (new operatorFile()).writeUserMess(u);
        System.out.println("=======>注册成功！");
    }
    public static HashMap<String,String> lucklyUsers=new HashMap<>();
    public void getLuckly() {
        if (!Dos.logined)   {
            System.out.println("===>警告：没有用户登录，无法抽奖！");
            return ;
        }
        while(lucklyUsers.size()<5)
        {
            String id="";
            ArrayList<String> u;
            while((u=(new operatorFile(id=String.valueOf ((int) (Math.random()*9000+1000)))).getUserMess(1)).size()<1){ }
            lucklyUsers.put(u.get(1),u.get(0));
        }
        Iterator iterator=lucklyUsers.entrySet().iterator();
        int no=1;
        boolean LUCKLY=false;
        System.out.println("====>恭喜以下用户获得幸运称号：");
        while(iterator.hasNext()){
            Map.Entry entry=(Map.Entry) iterator.next();
            System.out.println("幸运用户["+(no++)+"]  用户名："+entry.getValue()+"   用户编号："+entry.getKey());
            LUCKLY = entry.getKey().equals(this.userId) ? true : LUCKLY;
        }
        System.out.println(LUCKLY?"=========>恭喜您在本次抽奖中获得幸运称号！":"=========>很遗憾，今日您未获奖 ！-_-！");
    }
    public String toString(){
        return this.userName+" "+this.userId+" "+this.userPwd;
    }
}
public class operatorFile {
    String user;
    public void setUser(String user) {
        this.user = user;
    }
    public operatorFile(String user) {
        this.user = user;
    }
    public operatorFile() { }
    public ArrayList<String> getUserMess(int index){
        ArrayList<String> temp=new ArrayList<String>();
        File file=new File("user.txt");
        String line="";
        try{
            BufferedReader br=new BufferedReader(new FileReader(file));
            while ((line = br.readLine())!=null && line!="\n"){
                temp.clear();
                StringTokenizer sk=new StringTokenizer(line);
                while (sk.hasMoreTokens()) {
                    temp.add(sk.nextToken());
                }
                if (temp.get(index).equals(this.user))  break;
            }
        }
        catch(IOException e){}
        return (line==null)?new ArrayList<String>():temp;
    }
    public void writeUserMess(User u){
        try{
            BufferedWriter bw=new BufferedWriter(new FileWriter(new File("user.txt"),true));
            bw.write(u.toString()+"\n");
            bw.close();
        }
        catch (IOException e){ }
    }
}

That's all you need to do with java to create a raffle system.