Swing Slider :- Slider Extent Program

import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JSlider;
import javax.swing.SwingConstants;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

/**
 *
 * @author Amol
 */
public class MySliderExtend extends JApplet implements ActionListener , ChangeListener {
JSlider jSlider=new JSlider(SwingConstants.HORIZONTAL,0,100,0);
JButton button=new JButton("Set Extent to 44665");
    @Override
public void init(){
    Container contentPane = getContentPane();
    contentPane.setLayout(new FlowLayout());
    jSlider.addChangeListener(this);
    jSlider.setPaintTicks(true);
jSlider.setForeground(Color.red);
jSlider.setPaintTrack(true);
    jSlider.setMajorTickSpacing(20);
    jSlider.setMinorTickSpacing(10);


    jSlider.revalidate();
    contentPane.add(jSlider);
   button.addActionListener(this);
   contentPane.add(button);

}

    public void actionPerformed(ActionEvent e) {

    jSlider.setValue(80);
    jSlider.setExtent(60);
    jSlider.revalidate();
    }

    public void stateChanged(ChangeEvent e) {
JSlider Jslider1 =(JSlider)e.getSource();
    showStatus(" Amol Slider minimum: " + Jslider1.getMinimum()+"maximum : "+ Jslider1.getMaximum()+",Value:" + Jslider1.getValue()
            +",Extent:" + Jslider1.getExtent());

    }


}