Listar

public TreeSet<Persona> Listar() {
            FileReader entrada;
            TreeSet<Persona> lista= new TreeSet<Persona>();
            try {
                entrada = new FileReader(ruta);
                BufferedReader miBuffer = new BufferedReader(entrada);

               String linea = "";
                while (linea != null) {
                    String cadenaAux[]= new String[3];
                    Persona a= new Persona();
                    if(linea!="") {
                        cadenaAux = linea.split("-");
                        try {
                            if(DNI.verificarDNI(cadenaAux[2]))
                                lista.add(new Persona(cadenaAux[2],cadenaAux[0],cadenaAux[1]));
                        }
                        catch(DNIInvalidoException e){
                            e.getMessage();
                        }

                    }
                    linea = miBuffer.readLine();
                }
                miBuffer.close();
                entrada.close();
                return lista;

            }