幸运抽奖（面向对象）

User:

package com.javasm.bean;

/**
 * @Author：Zxb
 * @Version：1.0
 * @Date：2022/11/17-16:36
 * @Since：jdk1.8
 * @Description：
 */
public class User {
    public int userId;//卡号
    public String userName;//用户名
    public String userPwd;//密码
    public int userLoginState;//登入状态

    public User() {
    }

    public User(int userId, String userName, String userPwd, int userLoginState) {
        this.userId = userId;
        this.userName = userName;
        this.userPwd = userPwd;
        this.userLoginState = userLoginState;
    }

    public void show(){
        System.out.println("会员卡号：" +this.userId+ "\t用户名："+this.userName+"\t密码"+this.userPwd);
    }
}

UserService:

package com.javasm.service;

import com.javasm.bean.User;

import java.util.Arrays;
import java.util.Scanner;

/**
 * @Author：Zxb
 * @Version：1.0
 * @Date：2022/11/17-16:37
 * @Since：jdk1.8
 * @Description：
 */
public class UserService {
    static Scanner scanner = new Scanner(System.in);
    static User user = new User();

    public static void startMenu() {

        boolean b = true;
        while (b) {
            System.out.println("****************欢迎使用XXX抽奖系统*******************");
            System.out.println("\t\t1、注册");
            System.out.println("\t\t2、登录");
            System.out.println("\t\t3、抽奖");
            System.out.println("\t\t0、退出");
            System.out.println("请选择：");
            int choose = scanner.nextInt();
            switch (choose) {
                case 1:
                    reg();
                    break;
                case 2:
                    login();
                    break;
                case 3:
                    draw();
                    break;
                case 0:
                    System.out.println("[谢谢使用，系统已退出！！！]");
                    b = false;
                    break;
                default:
                    System.out.println("[选择错误，请重新选择!]");
                    break;
            }
        }
    }

    public static void reg() {

        System.out.println("抽奖系统>>>用户注册");
        System.out.println("请输入注册用户名：");
        user.userName = scanner.next();
        System.out.println("请输入注册密码");
        user.userPwd = scanner.next();
        user.userId = (int) (Math.random() * 9000 + 1000);
        System.out.println("注册成功，请记住你的会员卡号！");
        user.show();

    }

    public static void login() {
        int i=3;
        boolean b=true;
        while(b){
            i--;
            if(user.userName==null||user.userPwd==null){
                System.out.println("登入失败！你还未注册！");
                return;
            }
            System.out.println("抽奖系统>>>用户登录");

            System.out.println("请输入用户名:");
            String inputName=scanner.next();
            System.out.println("请输入密码:");
            String inputPwd=scanner.next();
            if(inputName.equals(user.userName)&&inputPwd.equals(user.userPwd)){
                System.out.println("登入成功！");
                user.userLoginState=1;
                return;
            }
            if(i==0) {
                System.out.println("机会使用完毕，退出系统");
                return;
            }
                System.out.println("用户名或密码错误！还剩"+i+"次机会");
                System.out.println("是否继续？y/n");
                String answer=scanner.next();
                if("n".equals(answer)||"N".equals(answer)){
                    System.out.println("退出系统");
                    return;
            }
        }
    }

    public static void draw() {
        int[] luckyNum=new int[5];
        if(user==null||user.userLoginState==0){
            System.out.println("请先登入");
        }else{
            for(int i=0;i<5;i++) {
                luckyNum[i]=(int) (Math.random() * 9000 + 1000);
            }
            System.out.println("今日幸运数字：" + Arrays.toString(luckyNum));
            for (int num : luckyNum) {
                if(num==user.userId) {
                    System.out.println("恭喜你，成为今日幸运用户！");
                }
            }
            System.out.println("抱歉，你不是幸运用户！");
        }


    }
}

UserTest:

package com.javasm.test;

import com.javasm.service.UserService;

/**
 * @Author：Zxb
 * @Version：1.0
 * @Date：2022/11/17-16:36
 * @Since：jdk1.8
 * @Description：
 */
public class UserTest {


    public static void main(String[] args) {
        UserService.startMenu();
    }
}