public void save() { for (String key : fields.keySet()) { JComponent comp = fields.get(key); if (comp instanceof JTextField) { JTextField c = (JTextField) comp; if (c.getText().trim().equals("")) { sketch.configFile.unset(key); } else { sketch.configFile.set(key, c.getText()); } } else if (comp instanceof JTextArea) { JTextArea c = (JTextArea) comp; if (c.getText().trim().equals("")) { sketch.configFile.unset(key); } else { sketch.configFile.set(key, c.getText()); } } } sketch.saveConfig(); }