问一个程序，两个窗口。如何使用观察者从第一条通知第二条更改？

EN

public class ObserverCtrl extends Observable {

    public ObserverCtrl(Secretariat window, ) {

        this.addObserver(window);
    }

    public ObserverCtrl(Comisie window) {

        this.addObserver(window);
    }



    public void refresh () {
        this.setChanged();
        this.notifyObservers();
    }

}

Secretariat window = new Secretariat();
Comisie window2 = new Comisie();

private ObserverCtrl observer;
this.observer = new ObserverCtrl(this)

@Override
public void update(Observable arg0, Object arg1) {
    candidat_TextField.setText(null);
    sectie_TextField.setText(null);
    codSectie_TextField.setText(null);
    confirmare_TextArea.setText(null);
    listModelCandidati.clear();
    listModelSectii.clear();
    loadSectiiListModel();
    loadCandidatiListModel();
}

@Override
public void update(Observable arg0, Object arg1) {
    this.loadSectiiListModel();

}