幸运抽奖

 public static String answer;
    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        boolean loginFlag=false;
        boolean reGister=false;
       do{
        System.out.println("1.注册");
        System.out.println("2.登录");
        System.out.println("3.抽奖");
        System.out.println("请选择");
        int select=input.nextInt();
        switch (select){
            case 1://register
               reGister = register(input);
                break;
            case 2://login
                 loginFlag=login(input,reGister);
                break;
            case 3://loterry
                loterry(input,loginFlag);
                break;
                default:
                    System.out.println("请输入有效选择");
        }
        System.out.println("是否继续？");
        answer=input.next();}
        while ("y".equals(answer));
        System.out.println("成功退出");
        input.close();
    }
    public static String num;
    public static String password;
  //定义全局变量，不然注册时候的账号和密码不能调用出来
    public static boolean login(Scanner input,boolean registerFlag){
      //与注册的账号密码进行比较
        if(!registerFlag){
            System.out.println("请先注册");
            return false;
        }
        int count=3;
        for (;count>0;) {
            count--;
            System.out.println("请输入登录账号：");
            String numLogin=input.next();
            System.out.println("请输入登录密码：");
            String passwordLogin=input.next();
            if (numLogin.equals(num) &&passwordLogin.equals(password)){
                break;
            }
            if(count==0) return false;
            System.out.println("账号或密码不符，还剩下" + (count) + "次机会");
        }
        System.out.println("登陆成功");
        return true;
    }
    public static boolean register(Scanner input){
        System.out.println("请输入注册账号：");
        num=input.next();
        System.out.println("请输入注册密码：");
        password=input.next();
        long cID=(long)(Math.random()*9000+1000);
        System.out.println("账号"+num);
        System.out.println("密码"+password);
        System.out.println("卡号"+cID);
        return true;

    }
    public static void loterry(Scanner input, boolean loginFlag){
        //登陆成功之后的操作
        if(!loginFlag){
            System.out.println("请先登录");
            return;
        }
        System.out.println("请输入卡号");
        long cardId=input.nextInt();
        int [] lucy=new int[5];
        for (int i = 0; i < 5; i++) {
            lucy[i]=(int)(Math.random()*9000+1000);
        }
        System.out.println("大奖卡号"+Arrays.toString(lucy));
        for(int i=0;i<5;i++){
            if(lucy[i]==cardId){
                System.out.println("恭喜您中奖");
               return;
            }
        }
        System.out.println("很遗憾您没有中奖");}