public class OracleJdbcTest   {       String driverClass = "oracle.jdbc.driver.OracleDriver";       Connection con;       public void init(FileInputStream fs) throws ClassNotFoundException, SQLException, FileNotFoundException, IOException       {           Properties props = new Properties();           props.load(fs);           String url = props.getProperty("db.url");           String userName = props.getProperty("db.user");           String password = props.getProperty("db.password");           Class.forName(driverClass);           con=DriverManager.getConnection(url, userName, password);       }       public void fetch() throws SQLException, IOException       {           PreparedStatement ps = con.prepareStatement("select SYSDATE from dual");           ResultSet rs = ps.executeQuery();           while (rs.next())           {               // do the thing you do           }           rs.close();           ps.close();       }       public static void main(String[] args)       {           OracleJdbcTest test = new OracleJdbcTest();           test.init();           test.fetch();       }   }