Delay test

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class DelayGUI extends JFrame
{
    private JPanel panel;
    private JLabel lblPic;
    private JButton btnClick;
    private ImageIcon img1, img2;

    public DelayGUI()
    {
        super("Delay Test");
        img1 = new ImageIcon("back.png");
        img2 = new ImageIcon("leia.png");
        panel = new JPanel();
        lblPic = new JLabel(img1);
        btnClick = new JButton(img1);
        //panel.add(lblPic);
        panel.add(btnClick);
        btnClick.addActionListener(new ButtonHandler());
        add(panel);

    }

    private class ButtonHandler implements ActionListener
    {
        @Override
        public void actionPerformed(ActionEvent e)
        {
            //"show" the image
            btnClick.setIcon(img2);
            //delay
            try {
                Thread.sleep(5000);
            } catch (InterruptedException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
            // now change pic back
            //btnClick.setIcon(img1);
        }

    }

    public static void main(String[] args)
    {
        // create object
        DelayGUI frame = new DelayGUI();
        frame.setSize(300, 300);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}