Layout of RadioButtons

Question

Hi everyone,
I have done some code for a menu with a JPanel and RadioButtons but I don't know how to change the layout. I need the buttons to be in the middle of the panel and underneath each other like:
. One
. Two
. Three
Would anyone be able to show me how to do this?
Here is my code.
public class RadioButtonFrame extends JFrame{
public RadioButtonFrame ()
          setTitle("RadioButtonTest");
          setSize(WIDTH, HEIGHT);
          Container contentPane = getContentPane();
          label = new JLabel(
               "Welcome to the Http Log Analyzer Program. Choose an option.");
          label.setFont(new Font("Serif", Font.BOLD,
               DEFAULT_SIZE));
          contentPane.add(label, BorderLayout.NORTH);
          buttonPanel = new JPanel();
          group = new ButtonGroup();
          JRadioButton button1 = new JRadioButton("Search for User Name", true);
          group.add(button1);
          buttonPanel.add(button1);     
          ActionListener listener = new ActionListener()
               public void actionPerformed(ActionEvent evt)
                    Queries.searchForUserName();
          button1.addActionListener(listener);
          JRadioButton button2 = new JRadioButton("Two", false);
          group.add(button2);
          buttonPanel.add(button2);     
          ActionListener listener2 = new ActionListener()
               public void actionPerformed(ActionEvent evt)
                    Queries.searchForFileName();
          button2.addActionListener(listener2);
          JRadioButton button3 = new JRadioButton("Three", false);
          group.add(button3);
          buttonPanel.add(button3);     
          ActionListener listener3 = new ActionListener()
               public void actionPerformed(ActionEvent evt)
                    Queries.searchForDates();
          button3.addActionListener(listener3);
          JRadioButton button4 = new JRadioButton("Four", false);
          group.add(button4);
          buttonPanel.add(button4);     
          ActionListener listener4 = new ActionListener()
               public void actionPerformed(ActionEvent evt)
                    Queries.searchForBytes();
          button4.addActionListener(listener4);
          JRadioButton button5 = new JRadioButton("Five", false);
          group.add(button5);
          buttonPanel.add(button5);     
          ActionListener listener5 = new ActionListener()
               public void actionPerformed(ActionEvent evt)
                    Queries.searchForTransferFailures();
          button5.addActionListener(listener5);
          contentPane.add(buttonPanel, BorderLayout.CENTER);     
     public static final int WIDTH = 600;
     public static final int HEIGHT = 400;
     private JPanel buttonPanel;
     private ButtonGroup group;
     private JLabel label;
     private static final int DEFAULT_SIZE = 20;
Thanks
Jonny

Answer 1

try the BoxLayout API or: ... ---> )
this.setLAtout(null);Sorry;-this.setLayout(null);