code: @Override
    public String getDescription() {
      String ucExt = extension.substring(1).toUpperCase();
      return (ucExt + " Files (*" + extension + ')');
    }
docs: Returns a description of what extension is being used (for file choosers).
  For example, if the suffix is "xml", the description will be
  "XML Files (*.xml)".
  
  @return description of this file filter