code: public static String showInputDialog(String title, String header, String content, String defaultValue) {
          TextInputDialog dialog = new TextInputDialog(defaultValue);
          dialog.setTitle(title);
          dialog.setHeaderText(header);
          dialog.setContentText(content);
  
          Optional<String> result = dialog.showAndWait();
          return result.orElse(null);
      }
docs: 弹出输入框
  
  @param title 标题
  @param header 信息头
  @param content 内容
  @param defaultValue 输入框默认值
  
  @return 输入的内容