Method for reading input files

readFile.java

/**
     * Read text file lines.
     *
     * @param fileName input file name should be at the same directory as the runner
     * @return list of string arrays
     */
    public static List<String[]> readFile(String fileName) {
        LinkedList<String[]> lines = new LinkedList<>();

        try (BufferedReader br = new BufferedReader(new FileReader(fileName))) {
            String line;
            while ((line = br.readLine()) != null)
                lines.add(line.split(" "));

        } catch (FileNotFoundException e) {
            System.err.println("File '" + e.getMessage() + "' does not exist, please provide correct file name");
            System.exit(0);
        } catch (IOException e) {
            System.err.println("An error occurred while reading the file");
            System.exit(1);
        }

        return lines;
    }