String[] items = { "Login", "Logout" ... };
String[] urls = { "urlOne", "urlTwo" ... };
JComboBox combo = new JComboBox(items);
combo.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int index = ((JComboBox)e.getSource()).getSelectedIndex();
String urlStr = urls[index];
// carry on