Problem extending JPanel

Question

Hi,
What is the best format to have a class with a JFrame and a number of JPanels, one of which needs to be painted on using Graphics.
class Demo extends JPanel{
public JFrame frame;
public JPanel panel1;
public JPanel panel2;
public JPanel panel3;
   Demo(){
      // initialise JFrame
      frame = new JFrame();
      // initialise a few JPanels
      panel1 = new JPanel();
      panel2 = new JPanel();
      panel3 = new JPanel();
      // refer to the JPanel I'm painting on
      frame.getContentPane(this);   // Is this correct?
     public void paint(Graphics g)     {
          g.drawString("Click below", 50, 50);               
              // now this method should paint over one of the JPanels only, the one I'm extending..
}Any thought appreciated.

Answer 1

Thanks for the pointers Haynese ,
I understand what I should be doing.
I have another issue with this now, maybe its constructed badly...
I can get the graphics objects on the JPanel to display but not the JButton or label I add. If I click in the region of the button and hit it, it appears. Any ideas?
public class GraphEditor extends JPanel implements MouseListener
public JButton button;
public JLabel label5;
     public GraphEditor(){
          //  JPanel Button, displays if clicked on.
          button = new JButton("JPanel Button, displays if clicked on...");
          this.add(button);
                                         //  This should display but never does
          label5 = new JLabel("This should display but never does");
          add(label5);
          setSize(50,50);
          setVisible(true);
     public void paint(Graphics g)     {
                                        // This displays fine
          g.drawString("This displays fine", 5, 5);               
}and:
public class SystemWindow extends JFrame {     
public JButton button;
public JPanel topPanel;
public JPanel bottomPanel;
public JPanel mainPanel;
public JLabel topPanelLabel;
public JLabel bottomPanelLabel;
public JButton getPathButton;
private GraphEditor mainMap = new GraphEditor(this);
     SystemWindow(){     
         topPanel = new JPanel();
          bottomPanel = new JPanel();
          mainPanel = new JPanel();
          // 10 is horizontal
                                           // 01 is vertical
          getContentPane().setLayout(new GridLayout(0,1));
          getContentPane().add(mainPanel);
          mainPanel.add(topPanel);
          mainPanel.add(bottomPanel);
          topPanelLabel = new JLabel("Top Panel");
          topPanel.add(topPanelLabel);
          bottomPanelLabel = new JLabel("Bottom Panel");
          bottomPanel.add(bottomPanelLabel);
          button = new JButton("Save");
          //button.addActionListener(this);
          bottomPanel.add(button);
          getPathButton = new JButton("Get");
          //getPathButton.addActionListener(this);
          bottomPanel.add(getPathButton);
          getContentPane().add(mainMap);
          setTitle("App Title");          
          setSize(500,300);          
          setLocation(100,100);     
          mainPanel.setVisible(true);
          topPanel.setVisible(true);
         bottomPanel.setVisible(true);
         setVisible(true);
     }          Any suggestions welcome.