import java.sql.*;
class dbaccess {
  public static void main (String args []) throws SQLException
  {
    try {
        DriverManager.registerDriver (new oracle.jdbc.driver.OracleDriver());

        Connection conn = DriverManager.getConnection("jdbc:oracle:thin:g3_jerzy/haslo@oraas:1521:ora2016");

        Statement stmt = conn.createStatement();
        ResultSet rset = stmt.executeQuery("select BANNER from SYS.V_$VERSION");
        while (rset.next())
              System.out.println(rset.getString(1));   // kol 1
        rset.close();
        stmt.close();
        conn.close();
    } catch (SQLException e) {
       System.err.println("Blad Oracle: "+ e.getErrorCode() + e.getMessage());
      }
  }
}