void searchFiu(String ID)
    {
        //read text file
        String line = "";
        //traverses the whole file line by line
        try
        {
            BufferedReader reader = new BufferedReader(
                                            new FileReader("FiuDB.txt"));
            while((line = reader.readLine()) != null)
            {
                String[] tokens = line.split(" ");
                if(tokens[0].equalsIgnoreCase(userID))
                {
                    userType = tokens[1];
                    for(int i = 2; i < tokens.length; i++)
                    {
                        userName += tokens[i];
                        if(i + 1 != tokens.length)
                            userName += " ";
                    }
                    reader.close();
                    return;
                }
            }
            userType = "Invalid";
            reader.close();
        }
                
        //handles any exception caused by reading the file
        catch(IOException e)
        {
            System.out.println("There was an error while reading the file");
        }
    }