private void enableFields(){
  regexTextField.setVisible(separationComboBox.getSelectedItem() == ColumnSeparator.REGULAR_EXPRESSION);
  regexEvalButton.setVisible(separationComboBox.getSelectedItem() == ColumnSeparator.REGULAR_EXPRESSION);
}

private void enableFields ( ) { regexTextField . setVisible ( separationComboBox . getSelectedItem ( ) == ColumnSeparator . REGULAR_EXPRESSION ) ; regexEvalButton . setVisible ( separationComboBox . getSelectedItem ( ) == ColumnSeparator . REGULAR_EXPRESSION ) ; }
enables the text field and button associated to the column separator combobox item " regular expression " .
