/**
     * Reads data from given text file, instantiates objects
     * (i.e. students and their marks) and inserts them into the teachers notebook.
     *
     * @param file Text file to read from
     * @throws FileNotFoundException if given file cannot be opened for reading
     * @throws IOException on any other I/O failure
     */
    public void load(File file) throws FileNotFoundException, IOException {
        if (file == null) {
            throw new IOException("File is null ");
        }
        if (!file.canRead()) {
            throw new FileNotFoundException("File can't be read");
        }

        BufferedReader br = null;

        try {
            br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));

            String line = br.readLine();
            while(line != null) {
                String[] split = line.split(":");
                if (split.length != 2) {
                    throw new IOException("Wrong input format ");
                }

                String[] studentSplit = split[0].split(" ");
                if (studentSplit.length != 3) {
                    throw new IOException("Wrong input format ");
                }
                int uco = 0;
                try {
                    uco = Integer.parseInt(studentSplit[0]);
                }
                catch (NumberFormatException ex) {
                    throw new IOException("Wrong input format ");
                }
                if (uco == 0) {
                    throw new IOException("Wrong input format ");
                }
                Student student = new Student(uco, studentSplit[1] + " " + studentSplit[2]);

                List<Mark> marks = new ArrayList<Mark>();
                String[] markSplit = split[1].split(" ");
                for (int i = 0; i < markSplit.length; i++) {
                    try {
                        marks.add(new Mark(Integer.parseInt(markSplit[i])));
                    }
                    catch (NumberFormatException ex) {
                        throw new IOException("Wrong input format ");
                    }
                }

                notebook.put(student, marks);
                line = br.readLine();
            }
        } catch (IOException ex) {
            throw new IOException(ex);
        } finally {
            br.close();
        }
    }