Applet notinited问题

Question

import java.net.*;
import java.applet.*;
import java.awt.*;class ShakeEditor extends Applet{
public URL ShakeURL;
public String ShakeHost;
public String ShakeProtocol;
      public void init(){
         ShakeURL = getDocumentBase();
         ShakeHost = getDocumentBase().getHost().toLowerCase();
         ShakeProtocol = ShakeURL.getProtocol().toLowerCase();
      }
      public void paint(Graphics g){
       g.drawString(ShakeHost,20,20);
      }
}

Answer 1

java.lang.NoClassDefFoundError at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at java.lang.Class.newInstance0(Unknown Source) at java.lang.Class.newInstance(Unknown Source) at sun.applet.AppletPanel.createApplet(Unknown Source) at sun.plugin.AppletViewer.createApplet(Unknown Source) at sun.applet.AppletPanel.runLoader(Unknown Source) at sun.applet.AppletPanel.run(Unknown Source) at java.lang.Thread.run(Unknown Source)