question: private void enableFields ( ) { regexTextField . setVisible ( separationComboBox . getSelectedItem ( ) == ColumnSeparator . REGULAR_EXPRESSION ) ; regexEvalButton . setVisible ( separationComboBox . getSelectedItem ( ) == ColumnSeparator . REGULAR_EXPRESSION ) ; }
target:  Enables the text field and button associated to the Column Separator combobox item "Regular Expression".