public void leerarchivo(){
       
        try {
           String line;
           FileReader fr = new FileReader(this.filename);
           BufferedReader br = new BufferedReader(fr);
            while ((line = br.readLine()) != null) {
                this.lineas.add(line);
                System.out.println(line);
            }
            br.close();
            fr.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }