import java.sql.*; 

import java.util.*; 
import java.lang.*; 
import org.postgis.*; 
 
public class JavaGIS { 
  public static void main(String[] args) 
  { 
    java.sql.Connection conn; 
    try 
    { 
      /* 
      * Load the JDBC driver and establish a connection. 
      */  
      Class.forName("org.postgresql.Driver"); 
      String url = "jdbc:postgresql://localhost:5432/database"; 
      conn = DriverManager.getConnection(url, "postgres", ""); 
 
      /* 
      * Add the geometry types to the connection. Note that you 
      * must cast the connection to the pgsql-specific connection * implementation before calling the addDataType() method. 
      */
      ((org.postgresql.Connection)conn).addDataType("geometry","org.postgis.PGgeometry");
      ((org.postgresql.Connection)conn).addDataType("box3d","org.postgis.PGbox3d");
 
      /* 
      * Create a statement and execute a select query. 
      */ 
      Statement s = conn.createStatement(); 
      ResultSet r = s.executeQuery("select AsText(geom) as geom,id from geomtable"); 
      while( r.next() ) 
      { 
        /* 
        * Retrieve the geometry as an object then cast it to the geometry type. 
        * Print things out. 
        */ 
        PGgeometry geom = (PGgeometry)r.getObject(1); 
        int id = r.getInt(2);
        System.out.println("Row " + id + ":"); 
        System.out.println(geom.toString()); 
      }
      s.close(); 
      conn.close(); 
    } 
    catch( Exception e ) 
    { 
      e.printStackTrace(); 
    }  
  }
}
위에서 보는 것과 같이       ((org.postgresql.Connection) 이부분에서 에러가 ...ㅜㅜ
이 프로그램을 돌리려면 Connection 클래스가 있어야 한다는데요...이걸 어디서 구하나요? 정확한 주소좀 알려주세요~아니면 다른 해결방안이라도..ㅜ.ㅜ