public static ArrayList<Arancel> listarArancel(int flag) {
        ArrayList<Arancel> lista = new ArrayList<Arancel>();
        ResultSet rs = Main.con.consultar(SQL.listarArancel(flag));
        try {
            while (rs.next()) {
                lista.add(new Arancel(rs.getInt("id_ara"), rs.getString("nombre"), rs.getFloat("costo"), rs.getInt("flag")));
            }
        } catch (SQLException ex) {
            Logger.getLogger(ManagerArancel.class.getName()).log(Level.SEVERE, null, ex);
        }

        return lista;
    }