returns the number of observers registered to this observable . concode_field_sep boolean changed concode_elem_sep List<Observer> observers concode_field_sep void deleteObservers concode_elem_sep void addObserver concode_elem_sep boolean hasChanged concode_elem_sep void clearChanged concode_elem_sep void deleteObserver concode_elem_sep void setChanged concode_elem_sep void notifyObservers concode_elem_sep void notifyObservers
int function ( ) { return observers . size ( ) ; }