Applet won't run on all platforms

Question

I've written a simple applet that compiles cleanly (apparently), and
will run on Solaris and Red Hat 9 using appletviewer; and it will run
on a friend's WinXP Pro system. But when I try to run it on my WIn XP
Pro system, I get these messages in the appletviewer window:
error:null
then
Start: applet not initialized
and in the DOS box I call appletviewer from, I get a string of
messages :
at Panel.<init>(Panel.java:10)
I'm using J2SE 1.4.1 on my XP system.
Thanks for any help!
Harry

Answer 1

OK, here's the code:
//CardDemo.java
//  action handling with multiple events
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class CardDemo extends Applet implements ActionListener{
  //Control panel components
  Panel pnlControls = new Panel();
  Button btnFirst = new Button("|<<");
  Button btnPrev = new Button("<==");
  Button btnC = new Button("C");
  Button btnNext = new Button("==>");
  Button btnLast = new Button(">>|");
  //The Cards
  Panel pnlCards = new Panel();
  CardLayout Stack = new CardLayout();
  Label lblA = new Label("A");
  Label lblB = new Label("B");
  Label lblC = new Label("C");
  Label lblD = new Label("D");
  Label lblE = new Label("E");
  public void init(){
    //set up the main page
    this.setLayout(new BorderLayout());
    this.add(pnlControls, BorderLayout.SOUTH);
    this.add(pnlCards, BorderLayout.CENTER);
    // set up the control panel
    pnlControls.setFont(new Font("SanSerif",Font.BOLD, 20));
    pnlControls.setLayout(new FlowLayout());
    pnlControls.add(btnFirst);
    pnlControls.add(btnPrev);
    pnlControls.add(btnC);
    pnlControls.add(btnNext);
    pnlControls.add(btnLast);
     // register the ActionListener
    btnFirst.addActionListener(this);
    btnPrev.addActionListener(this);
    btnC.addActionListener(this);
    btnNext.addActionListener(this);
    btnLast.addActionListener(this);
    //set up the card panel
    pnlCards.setLayout(Stack);
    pnlCards.setFont(new Font("SanSerif",Font.BOLD, 60));
    pnlCards.add(lblA,"A");
    pnlCards.add(lblB,"B");
    pnlCards.add(lblC,"C");
    pnlCards.add(lblD,"D");
    pnlCards.add(lblE,"E");
    //center the labels
    lblA.setAlignment(Label.CENTER);
    lblB.setAlignment(Label.CENTER);
    lblC.setAlignment(Label.CENTER);
    lblD.setAlignment(Label.CENTER);
    lblE.setAlignment(Label.CENTER);
   } // end init
    public void actionPerformed(ActionEvent e){
         //get the name of the button that was pressed
         String theCommand = e.getActionCommand();
         //check to see which button was pressed
         if (theCommand.equals("|<<")){
        Stack.first(pnlCards);
      else if (theCommand.equals("<==")){
        Stack.previous(pnlCards);
      else if (theCommand.equals("C")){
        Stack.show(pnlCards,"C");
      else if (theCommand.equals("==>")){
        Stack.next(pnlCards);
      else if (theCommand.equals(">>|")){
        Stack.last(pnlCards);
      }  // end if
   } // end ActionPerformed
} // end class def