private void A1ActionPerformed (java.awt.event.ActionEvent evt) {
        try {
            Object day = cmbHari.getSelectedItem ();
            Object stud = cmbStud.getSelectedItem ();
            String sql = "SELECT * FROM message where id_kursi = '" + A1.getText () + "' AND id_film = '" + txtIDFilm.getText () + "' AND start = '" + txtJam.getText () + "' AND day = '"+ day +"' AND studio = '"+ stud +"' ";
            Stat statement = conn.createStatement ();
            ResultSet result = stat.executeQuery (sql);
            if (result.equals (true)) {
                JOptionPane.showMessageDialog (null, "Seat has been booked");
            } else {
                JOptionPane.showMessageDialog (null, "Seat booked");
                txtKur.setText ("A1");
            }
        } catch (SQLException ex) {
            Logger.getLogger (belitiket.class.getName ()). Log (Level.SEVERE, null, ex);
        }
    }