Explication détaillée de la mise en œuvre JAVA de la loterie des utilisateurs

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){ }
    }}