Scroll Bar in Java

import java.awt.*;
import java.awt.event.*;
class Myscroll extends Frame implements AdjustmentListener
{
String msg="";
Scrollbar s1;
Myscroll()
{
setLayout(null);
s1=new Scrollbar(Scrollbar.VERTICAL,0,30,0,400);
s1.setBounds(250,50,30,200);
add(s1);
s1.addAdjustmentListener(this);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
});
}
public void adjustmentValueChanged(AdjustmentEvent ae)
{
repaint();
}
public void paint (Graphics g)
{
g.drawString("SCROLLBAR POSITION:",20,150);
msg+=s1.getValue();
g.drawString(msg,20,180);
msg="";
}
public static void main(String args[])
{
Myscroll ms=new Myscroll();
ms.setTitle("Myscroll bar");
ms.setSize(400,400);
ms.setVisible(true);
}
}