How to enable Oracle's stored procedures to return a result set

Oracle Stored procedures:

CREATE OR REPLACE PROCEDURE getcity (  citycode       in VARCHAR2,  ref_cursor out   sys_refcursor/      * This sys_refcursor type is in the Sys.standard package */) Asbegin  OPEN ref_cursor for    SELECT * from      tb_city_code     WHERE City_code = Citycode; end;/

Java calling code:

try {          drivermanager.registerdriver (new Oracle.jdbc.OracleDriver ());          Connection conn = Drivermanager.getconnection ("Jdbc:oracle:thin: @localhost: 1521:WJW", "SMS", "SMS");          CallableStatement stmt = Conn.preparecall ("BEGIN getcity (?,?); END; ");          CallableStatement stmt = Conn.preparecall ("{Call getcity (?,?)}");  It is not possible to implement multi-line Syntax          stmt.setstring (1, "021") with this calling method;          Stmt.registeroutparameter (2, -10/* oracletypes.cursor = 10 */); REF CURSOR (oracletypes.cursor==-10)          stmt.execute ();          ResultSet rs = (ResultSet) stmt.getobject (2);          while (Rs.next ()) {            System.out.println (rs.getstring ("City_name"));          }          Rs.close ();          rs = null;          Stmt.close ();          stmt = null;          Conn.close ();          conn = null;        }        catch (SQLException e) {          System.out.println (e.getlocalizedmessage ());        }

How to make Oracle's stored procedure return a result set