returns the number of registered listeners . concode_field_sep int EQUALITY concode_elem_sep boolean identity concode_elem_sep Object[] listeners concode_elem_sep Object[] EmptyArray concode_elem_sep int IDENTITY concode_field_sep void add concode_elem_sep Object[] getListeners concode_elem_sep boolean isEmpty concode_elem_sep void clear concode_elem_sep void remove
int function ( ) { return listeners . length ; }