I have a csv file that is being loaded in my programme. It contains citys and areas and some other stuff (not important here). Once the csv is selected I load the data into several comboboxes.

1 Thing is not working, I have a combobox containing all the citys and now I need to list all the areas for that country based on selection from the combobox.

Here is the event:

 private void cboProvinciesItemStateChanged(java.awt.event.ItemEvent evt) {                                               
   //System.out.println(Arrays.asList(gemeentesPerProvincie(gemeentes)));
    invullenListProvincie(gemeentes);
}      

Here is the method:

      private void invullenListProvincie(ArrayList<Gemeentes> gemeentes) {

    Gemeentes gf = (Gemeentes) cboProvincies.getSelectedItem();
    DefaultListModel model = new DefaultListModel();
    JList list = new JList(model);

    for (Gemeentes gemeente : gemeentesPerProvincie(gemeentes)) {
        model.addElement(gemeente);
    }

    lstGemeentes.setModel(model);

}

and this is the method to filter all the areas that equal the selection from the combobox:

    private ArrayList<Gemeentes> gemeentesPerProvincie(ArrayList<Gemeentes> gemeentes) {

    String GemPerProv = (String) cboProvincies.getSelectedItem();
    ArrayList<Gemeentes> selectie = new ArrayList<Gemeentes>();
    for (Gemeentes gemeente : gemeentes) {
        if (gemeente.getsProvincie().equals(GemPerProv)) {
            selectie.add(gemeente);
        }
    }

    return selectie;
}

I am convinced the error is the way I am trying to add items to the jList gemeentesPerProvincie(), I have tried so many things already. I really hope someone can see what i am clearly missing...