public void insertUpdate(DocumentEvent e){
          try{
            redInt = Integer.parseInt(
                                   redField.getText());
            if((redInt >= 0) && (redInt <= 255)){
              paintColorSwatch();
            }//end if
          }catch(Exception ex){
            //do nothing on exception
          }//end catch
        }//end insertUpdate
        //-------------------------------------------//

      }//end new DocumentListener
    );//end addDocumentListener