public ArrayList<User> initialTeacherList() {

    ArrayList<User> teacherList = new ArrayList<User>();

    try {
      br = new BufferedReader(new FileReader("data/teacher.txt"));
      while ((line = br.readLine()) != null) {
        String[] split = line.split(" ");
        Teacher newTeacher = new Teacher();
        newTeacher.setId(split[0]);
        newTeacher.setName(split[1]);
        newTeacher.setPassword(split[2]);
        newTeacher.setType("teacher");
        teacherList.add(newTeacher);
      }
    } catch (IOException ex) {
      ex.printStackTrace();
    }

    return teacherList;
  }