...

            try {

                sql.connectionToSql();

                ResultSet rs = sql.queryToSql("SELECT * " +
                                                            "FROM " + sql.PREFIX + "street " +
                                                            "ORDER BY `street` ASC;");

                    while(rs.next()) {
                        Streets s = new Streets(rs.getInt("id"),rs.getString("street"));
                        carOwnerStreet.getItems().add(new Streets(s.getId(),s.getStreet()));
                    }

            } catch(SQLException ex) { System.out.println(ex);
            } finally { sql.disconnectionFromSql(); }

...

    class Streets {

        public int id;
        public String street;

        Streets(int _id, String _street) {

            this.id = _id;
            this.street = _street;

        }

        public int getId() { return id; }
        public String getStreet() { return street; }
        @Override
        public String toString() { return street; }

    }