try

         {

           Class.forName( "org.postgresql.Driver" ).newInstance();

           String url = "jdbc:postgresql://localhost:5432/postgres" ;

           Connection con = DriverManager.getConnection(url, "postgres" , "123" );

           Statement st = con.createStatement();

          return st;

       }

        catch (Exception ee)

        {

           System.out.print(ee.getMessage());

           return null;

       }