JApplet not found in Internet Explorer 5.0

Question

I learning how works JApplet's, but I Have a problem.
Somebody can say to me because my code does not work?
My code:
import javax.swing.JApplet;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.text.*;
import javax.swing.event.*;
import javax.swing.border.*;
public class JAppletExample extends JApplet
JButton jb;
BorderLayout layout;
public void init()
layout=new BorderLayout(20,10);
this.setLayout(layout);
jb=new JButton("prueba ");
this.add("Center",jb);
public void start() { }
This is the error message from the Java Console:
java.lang.ClassNotFoundException: javax.swing.JApplet
     at com/ms/vm/loader/URLClassLoader.loadClass
     at java/lang/ClassLoader.loadClassInternal
     at java/lang/ClassLoader.resolveClass
     at com/ms/vm/loader/URLClassLoader.loadClass
     at com/ms/vm/loader/URLClassLoader.loadClass
     at com/ms/applet/AppletPanel.securedClassLoad
     at com/ms/applet/AppletPanel.processSentEvent
     at com/ms/applet/AppletPanel.processSentEvent
     at com/ms/applet/AppletPanel.run
     at java/lang/Thread.run
Thanks in advance.

Answer 1

You can force Internet Explorer to use the Sun Java Plugin by changing this key into windows registry:
Registry>HKEY_LOCAL_MACHINE>SOFTWARE>JavaSoft>Java Plug-in>1.4.1_02>UseJava2Iexplorer
Modify the value REG_DWORD from 0x00000000 (0) to 0x00000001 (1). This way you force IE to use your installed Sun Java Virtual Machine (with Swing support) instead the old Microsoft Virtual Machine.