Images don't appear in Swing code

[Vonique Leary]

The following code is from Java In Easy Steps:

import java.awt.*;  /*import required classes*/
import java.awt.event.*;
import javax.swing.*;

public class jug extends JApplet implements Runnable, ActionListener

{
  Thread runner;
JButton play;
JButton stop;
Image[] pic = new Image[5];
int total = 0;
int count = 0;

public void init()
 {
   for(int i = 0; i<5; i++)
    {
      String img =null;
      img = getParameter("image"+i);
      if (img != null)
        {
          pic[i] = getImage(getCodeBase(), img);
          total++;
         }
      }


  Container contentArea = getContentPane();
  GridLayout grid = new GridLayout(1,2);
  contentArea.setLayout(grid);
  contentArea.setBackground(Color.white);
   
  JugglerPanel animation = new JugglerPanel();

  JPanel console = new JPanel();
  FlowLayout flow = new FlowLayout();
  console.setLayout(flow);
  console.setBackground(Color.white);

 Image signImage = getImage(getCodeBase(),"sign.gif");
 ImageIcon signIcon = new ImageIcon(signImage);
 JLabel sign = new JLabel(signIcon);
 Image playImage = getImage(getCodeBase(), "accept.gif");
 ImageIcon playIcon = new ImageIcon(playImage);
 
  play = new JButton("Click to start", playIcon);
  play.addActionListener(this);

  Image stopImage = getImage(getCodeBase(),"cancel.gif");
  ImageIcon stopIcon = new ImageIcon(stopImage); 
  stop = new JButton("Click to Stop", stopIcon);
  stop.addActionListener(this);

  console.add(sign);
  console.add(play);
  contentArea.add(animation);
  contentArea.add(console);
  setContentPane(contentArea);
 }

   public void actionPerformed(ActionEvent event)
    {
     if(event.getSource() == stop) stop();
     if(event.getSource() == play) start();
    }


  class JugglerPanel extends JPanel
  {
    public void paintComponent(Graphics painter)
     {
       if (pic[count] != null )
       painter.drawImage (pic[count], 0, 0, this);
       
     }
    }

   public void start()
    {
      if(runner == null)
         {
           runner = new Thread(this);
           runner.start();
         }
      }


    public void stop()
     {
       if (runner != null) runner = null;

     }


    public void run()

     {
       while (runner == Thread.currentThread()  )

        {

          repaint();
          count++;
          if(count >= total) count = 0;
          try
           {
             Thread.sleep(100);
           }
           catch(InterruptedException e)

              {

              }

           }

         }
      }

/*public static void main(String[] args)
{
  Juggler jug = new Juggler();

 }
}
*/

It is downloaded exactly from the book but no juggler appears and I can't figure out why.

http://www.ineasysteps.com/books/details/?1840780258 here are the images to get the pictures if anyone is interested in trying out the code.

Thanks,
Vonique

[Greg Brannon]

I see you've commented out your main() method, which I assume is what you used to test the class. Explain what's going on there.

Also, the same main() method instantiates a Juggler object, jug, using the constructor Juggler(). You don't have a Juggler object defined or a constructor Juggler(). Are you sure you copied it directly from the book example? It doesn't make sense. Class names are capitalized by convention, which makes me think you've modified the book code, OR the book is non-standard.

[Vonique Leary]

Never mind. Figured it out already. Thanks anyway!

[Campbell Ritchie]

Nice to see you again Please tell us how you sorted it out, because others might have the same problem in future.

[Vonique Leary]

Hi Campbell,

Well, it was just a case of not studying it adequately because there were a few labels and buttons missing. Those simple things were revealed upon closer inspection.

[Campbell Ritchie]

Thank you.