java program to display and performed operation on scroll bar using applet.

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/* <applet code = "scroll" height=150 width=150>
   </applet>
*/

public class scroll extends Applet implements ActionListener,ContainerListener
{
      ScrollPane sp = new ScrollPane(ScrollPane.SCROLLBARS_ALWAYS);
      public void init()
      {
        


   setLayout(new BorderLayout());
            Panel p = new Panel(new GridLayout(7,8));
            p.addContainerListener(this);
           
            for(int j=0 ; j<50 ; j++)
                    p.add(new Button("BUTTON - "+j));
           
            sp.add(p);
            add(sp,"Center");
       }
       public void componentAdded(ContainerEvent e)
       {
             if(e.getID() == ContainerEvent.COMPONENT_ADDED)
             {
                   if(e.getChild() instanceof Button)
                   {
                         Button b = (Button)e.getChild();
                         b.addActionListener(this);
                   }
             }
       }
       public void componentRemoved(ContainerEvent e)
       {}
       public void actionPerformed (ActionEvent e)
       {
             Dimension d = sp.getViewportSize();
             sp.setScrollPosition((int)(Math.random()*d.width) , (int)(Math.random()*d.height));
       }
}