Method deleteObserver

classpath/java/util/Observable.java:33–40

(Observer o)

  }

  public void deleteObserver(Observer o) {
    if(o == null) {
      throw new NullPointerException();
    }
    synchronized(this) {
      observers.remove(o);
    }
  }

  public void notifyObservers() {
    notifyObservers(null);