Help - trouble applying JScrollPane

Question

Hello all,
With the code following my question I have trouble getting a scrollbar. What I get is a frame with an iteration of radiobuttons and a label (exactly what I want), but the iteration drops out of my frame without a functional scrollbar (the scrollbar drops out of the frame too). Could anyone help me out?
BTW tempData is a Hashtable filled with Objects.
final JFrame venster = new JFrame("yada");
venster.getContentPane().setLayout(new BorderLayout());
venster.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel p4 = new JPanel();
p4.setLayout(new GridLayout(0, 2, 50, 5));
JScrollPane bar = new JScrollPane(p4);
int counter = 0;
final String [] namen = new String[tempData.size()];
final JRadioButton [] r1 = new JRadioButton[tempData.size()];
final JRadioButton [] r2 = new JRadioButton[tempData.size()];
final JRadioButton [] r3 = new JRadioButton[tempData.size()];
final JPanel [] panels = new JPanel[tempData.size()];
final JLabel [] vnaam = new JLabel[tempData.size()];
for(int i = 0; i < tempData.size();i++) {
r1[i] = new JRadioButton();
r2[i] = new JRadioButton();
r3[i] = new JRadioButton();
panels[i] = new JPanel();
for(Enumeration enu = tempData.keys(); enu.hasMoreElements();) {
namen[counter] = ((String)enu.nextElement());
Vak v = ((Vak)tempData.get(namen[counter]));
vnaam[counter] = new JLabel(v.getNaam());
ButtonGroup b = new ButtonGroup();
r1[counter].setSelected(true);
b.add(r1[counter]);
b.add(r2[counter]);
b.add(r3[counter]);
panels[counter].add(r1[counter]);
panels[counter].add(r2[counter]);
panels[counter].add(r3[counter]);
p4.add(panels[counter]);
p4.add(vnaam[counter]);
counter++;     
venster.getContentPane().add(bar, BorderLayout.NORTH);
venster.pack();
venster.setSize(900,600);
venster.show();

Answer 1

How to use scroll panes