public void actionPerformed(ActionEvent e) { if (e.getSource() == submit) { if (rb1.isSelected()) { JFrame frame = Application.getFrame(); if (typeCodes.isEmpty()) { JOptionPane.showMessageDialog( frame, "Please select at least one toponym type.", "Error", JOptionPane.ERROR_MESSAGE); } else { Application.getMainCitiesPanel(this, typeCodes, 0, 0.0); } } else if (rb2.isSelected()) { JFrame frame = Application.getFrame(); try { nCities = new Integer(nCitiesField.getText()); if (nCities <= 0) throw new NumberFormatException(); typeCodes = new ArrayList<String>(); Application.getMainCitiesPanel(this, typeCodes, nCities, 0.0); } catch (NumberFormatException ex) { JOptionPane.showMessageDialog( frame, "Please enter a positive integer number.", "Error", JOptionPane.ERROR_MESSAGE); } } else { JFrame frame = Application.getFrame(); try { Double dist = new Double(distField.getText()); if (dist <= 0) throw new NumberFormatException(); typeCodes = new ArrayList<String>(); Application.getMainCitiesPanel(this, typeCodes, 0, dist); } catch (NumberFormatException ex) { JOptionPane.showMessageDialog( frame, "Please enter a positive number.", "Error", JOptionPane.ERROR_MESSAGE); } } } else { Application.getOptionPanel(this, countryName); } }