boolean function ( ) { return index != - 1 ; }
returns true if there is a selection , and false otherwise . concode_field_sep long serialVersionUID concode_elem_sep EventListenerList listenerList concode_elem_sep int index concode_elem_sep ChangeEvent changeEvent concode_field_sep T[] getListeners concode_elem_sep void removeChangeListener concode_elem_sep ChangeListener[] getChangeListeners concode_elem_sep void fireStateChanged concode_elem_sep void clearSelection concode_elem_sep int getSelectedIndex concode_elem_sep void setSelectedIndex concode_elem_sep void addChangeListener