Formlayout and JPanel

Question

Hi,
Its been some time since I last programmed with Java and I am happy to revisit it, but my knowledge is somewhat rusty. This is so elementary I feel a bit dim for asking it!
I'm trying to create a JApplet which will have two JPanels next to each other, in a FormLayout. The first
JPanel will be something of a canvas allowing the applet to draw images on it; the second is an image that
the routine uploads.
Below is the bare bones programme. I can get the second JPanel to display the image, but the first won't show;
at the moment, its just a simple override of paintComponent showing a green circle to ensure that I can display
something on screen. Is there anything obviously wrong?
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class DeaApplet extends JApplet
zapPanel zap_panel;
deaPanel dea_panel;
public void init ()
    Container content_pane = getContentPane ();
    // Grab the image.
    Image img = getImage (getCodeBase (), "zap_perch.PNG");
    // Create an instanceof DrawingPanel
    zap_panel =  new zapPanel (img);
    dea_panel = new deaPanel();
    dea_panel.setSize(100,100);
    dea_panel.setVisible(true);
    // Add the DrawingPanel to the content pane.
    content_pane.add (dea_panel);
    content_pane.add (zap_panel);
    content_pane.setVisible(true);
class deaPanel extends JPanel
   deaPanel ()
   public void paintComponent(Graphics g)
       //super.paintComponent(g);
    int width = getWidth();
    int height = getHeight();
    //System.out.println(width);
    g.setColor( Color.GREEN );
    g.drawOval(0, 0, width, height);
class zapPanel extends JPanel implements MouseListener
  Image img;
  zapPanel (Image img)
  { this.img = img;
  public void paintComponent (Graphics g) {
   super.paintComponent (g);
   // Use the image width & height to find the starting point
   int imgX = getSize ().width/2 - img.getWidth (this);
   int imgY = getSize ().height/2 - img.getHeight (this);
   //Draw image centered in the middle of the panel   
   g.drawImage (img, imgX, imgY, this);
  } // paintComponent
  public void mousePressed (MouseEvent e)
  public void mouseReleased (MouseEvent e)
  public void mouseEntered (MouseEvent e)
  public void mouseExited (MouseEvent e)
  public void mouseClicked (MouseEvent e)
    //saySomething ("Mouse clicked  (# of clicks: "
     //             + e.getClickCount () + ")", e);
    // Between 62,53 and 127,202
      int mx = e.getX();
      int my = e.getY();
}

Answer 1

I'm trying to create a JApplet which will have two JPanels next to each other, in a FormLayout.1. FormLayout isn't a standard JDK class. Why not use one of the standard layouts? For just adding two components side by side, many of them would fit the bill. Or use a JSplitPane if you want the contents to be resizable.
2. The code you posted doesn't in fact use any FormLayout but rather the JApplet's default BorderLayout. So it's expected that you could see only the last component added to the default location of CENTER.\
3. setSize is redundant and undesired when the component is added to a container with a non-null layout manager.