public void actionPerformed(ActionEvent e) { JComboBox cb = (JComboBox) e.getSource(); String command = (String) cb.getSelectedItem(); brsConfig.setVisible(false); travosConfig.setVisible(false); personalizedConfig.setVisible(false); othersConfig.setVisible(false); if (command.equalsIgnoreCase("BRS")) { brsConfig.setVisible(true); } else if (command.equalsIgnoreCase("TRAVOS")) { travosConfig.setVisible(true); } else if (command.equalsIgnoreCase("Personalized")) { personalizedConfig.setVisible(true); } else if (command.equalsIgnoreCase("Others")) { othersConfig.setVisible(true); } }