ObservableDelegate

This object can be used by one class that must extend one mother class and be observed. It can be Observable using one delegate class. See java.util.Observer/Observable classes and interface.

Code snippet.

public Class A implements Observer{
  public void update(Observable o, Object arg){
    if(o instanceof ObservableDelegate){
        Object source = ((ObservableDelegate)o).getSource();
    }
    //add code
 }
}

public Class B {
  ObservableDelegate delegate;
  public B(){
    delegate = ObservableDelegate(this);
  }

  public void addObserver(Observer o){
    delegate.addObserver(Observer o);
  }
}