Constructor

    public WGraph(String FName) throws IOException {
        File file = new File(FName);
        FileReader fr = new FileReader(file);
        BufferedReader br = new BufferedReader(fr);

        numberOfVertices = Integer.parseInt(br.readLine());
        numberOfEdges = Integer.parseInt(br.readLine());

        String text;

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

        }
    }