Train

public class Trains {
    private Map<String, TrainInfo> trains;

    public Trains() {
        trains = new HashMap<>();
    }

    public void process() throws IOException {
        BufferedReader in = null;
        try {
            InputStream stream = Trains.class.getResourceAsStream("trainlog.txt");
            in = new BufferedReader(new InputStreamReader(stream));

            String line;

            while ((line = in.readLine()) != null) {
                String[] data = line.split(";");

                boolean arrival = data[1].trim().equals("arrival");
                String id = data[0].trim();

                TrainInfo train = trains.get(id);
                if (train == null) {
                    if (arrival) {
                        System.err.println("There is no arrival for the train " + id);
                        System.exit(-1);
                    }

                    train = new TrainInfo(id);
                    trains.put(id, train);
                }

                int time = Integer.parseInt(data[2].trim());
                if (arrival)
                    train.arrived(time);
                else
                    train.departed(time);
            } // end while()

            print();
        } finally {
            if (in != null)
                in.close();
        }
    }

    private void print() {
        Set<TrainInfo> set = new TreeSet<>();
        set.addAll(trains.values());

        for (TrainInfo t: set)
            System.out.println(t);
    }

    public static void main(String[] args) throws IOException {
        new Trains().process();
    }
}