QListView only displaying last item

Hi everyone,

I am totally new to QT(Jambi) and tried to create a simple application with a QListView
that should contain some numbers. Unfortunately only the last number is displayed.
What am I doing wrong?

Here is the code of my two classes:

Code:

import java.util.ArrayList;
import java.util.List;
import com.trolltech.qt.gui.QApplication;
import com.trolltech.qt.gui.QMainWindow;
import com.trolltech.qt.gui.QWidget;
 
public class ListBox extends QMainWindow
{
    Ui_MainWindow ui = new Ui_MainWindow();
 
    public static void main(String[] args)
    {
        QApplication.initialize(args);
        ListBox gnah = new ListBox();
        gnah.show();
        QApplication.exec();
    }
 
    public ListBox()
    {
        ui.setupUi(this);
        initialize();
    }
 
    public ListBox(QWidget parent)
    {
        super(parent);
        ui.setupUi(this);
        initialize();
    }
 
    private void initialize()
    {
        List<Integer> data = new ArrayList<Integer>();
        data.add(42);
        data.add(666);
        data.add(1337);
 
        ListBoxModel model = new ListBoxModel(data);
 
        this.ui.listView.setModel(model);
    }
}

Code:

import java.util.List;
import com.trolltech.qt.core.QAbstractListModel;
import com.trolltech.qt.core.QModelIndex;
import com.trolltech.qt.core.Qt.ItemDataRole;
 
public class ListBoxModel extends QAbstractListModel
{
    private List<Integer> data;
 
    public ListBoxModel(List<Integer> data)
    {
        this.data = data;
    }
 
    @Override
    public Object data(QModelIndex arg0, int arg1)
    {
        if(arg1 == ItemDataRole.DisplayRole)
        {
            return data.get(arg0.row());
        }
        else
        {
            return null;
        }
    }
 
    @Override
    public int rowCount(QModelIndex arg0)
    {
        return data.size();
    }
}