【java】简单的整型注册登录功能的实现

青旅半醒 2022-02-25 01:57 280阅读 0赞

public static boolean login(int[] message){
            Scanner scanner = new Scanner(System.in);
            System.out.println("请输入账号：");
            int id = scanner.nextInt();
            int i = 0;
            for(;i<message.length;i++){//TODO:
                if(message[i] == id){
                    return true;
                }
            }
            return false;
        }
    
        public static boolean register(int[] message){
            Scanner scanner = new Scanner(System.in);
            System.out.println("请输入账号：");
            int id = scanner.nextInt();
            //是否之前存在id,存在，注册失败
            for(int i=0;i<message.length;i++){//TODO:
                if(message[i] == id){
                    return false;
                }
            }
            //有效个数：TODO:
    //100000000   1 2 3 4 5 99  9 9  9  9
            for(int i=0;i<message.length;i++){//TODO:
                if(message[i] == 0){
                    message[i] = id;//找到合适位置放id
                    return true;
                }
            }
            return false;
        }
        public static void main(String[] args) {
            int[] message = new int[10];
               boolean flag=false;
            while (true) {
                System.out.println("1.登陆 2注册  3退出");
                Scanner scanner = new Scanner(System.in);
                int choice = scanner.nextInt();
                if (choice == 3) {
                    return;
                }
                switch (choice) {
                    case 1:
                        flag = login(message);
                        if(flag) {
                            System.out.println("登陆成功");
                        }else{
                            System.out.println("登陆失败");
                        }
                        break;
                    case 2:
                        flag = register(message);
                        if(flag) {
                            System.out.println("注册成功");
                        }else{
                            System.out.println("注册失败");
                        }
                        break;
                    default:
                        System.out.println("输入错误");
                }
            }
        }
    }