SWING(Panel Change)

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class PanelChange extends JFrame implements ActionListener,MouseListener
{

JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
JLabel label = new JLabel("This is label");
JButton but = new JButton("This is button");

public PanelChange()
{
panel1.add(label);
panel2.add(but);


but.addActionListener(this);
label.addMouseListener(this);

getContentPane().add(panel2);
}

public void mouseClicked(MouseEvent me)
{
if(me.getClickCount() == 1)
{
panel1.setVisible(false);
getContentPane().add(panel2);
panel2.setVisible(true);
}
}
public void mousePressed(MouseEvent me){}
public void mouseReleased(MouseEvent me){}
public void mouseEntered(MouseEvent me){}
public void mouseExited(MouseEvent me){}

public void actionPerformed(ActionEvent ae)
{
if(ae.getSource() == but)
{
panel2.setVisible(false);
getContentPane().add(panel1);
panel1.setVisible(true);
}
}

public static void main(String args[])
{
PanelChange pc = new PanelChange();
pc.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pc.setSize(200,200);
pc.setVisible(true);
}


}