public boolean isAuthenticated(String username, String password)   throws    FileNotFoundException{
    boolean status = true;
    File file = new File("");
    Scanner scan = new Scanner(file);

    List<Login> login = new ArrayList<Login>();

    while(scan.hasNextLine()){
        String line = scan.nextLine();
        String [] details = line.split(":");
        String storedUsername = details[0];
        String storedPassword = details[1];
        Login l = new Login(username, password);

        if(storedUsername.equals(username)&& storedPassword.equals(password)){
            status = true;
        }else{
            status = false;
        }

    }
    return status;
}