Animation

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

public class SwingAnimation implements Runnable,ActionListener
{
    Thread th =new Thread(this);;
    volatile boolean animate=true;
    ImageIcon images;
    JFrame frame;
    JLabel jlb;
    int i = 0;
    int j;
        JButton jb,jb2;
    Panel panel3;
        public SwingAnimation()
        {
        frame = new JFrame("Animation Frame");

        jlb = new JLabel();
        panel3= new Panel();
        panel3.add(jlb);
        jb=new JButton("Pause");
        jb.setActionCommand("Pause");
        jb.addActionListener(this);
        panel3.add(jb);
        jb2=new JButton("Resume");
        jb2.setActionCommand("Resume");
        jb2.addActionListener(this);
        panel3.add(jb2);
        frame.add(panel3, BorderLayout.CENTER);
        frame.setSize(400, 400);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        th.start();
    }
                public void run()
        {
        try
                   {
            while(true)
            {

            for(i = 1; i <= 3; i++)
                {
                if(animate)
                {
                           images = new ImageIcon("images/img" + i + ".gif");
                   jlb.setIcon(images);
                   th.sleep(400);
                            }
                }
                       }
                  }
                  catch(InterruptedException e){}
    }


    public void actionPerformed(ActionEvent ae)
    {
     if((ae.getActionCommand()).equals("Pause"))
     {
         animate=false;
         jb.setEnabled(false);
         jb2.setEnabled(true);
        }
     else if((ae.getActionCommand()).equals("Resume"))
     {
       animate=true;
       jb2.setEnabled(false);
       jb.setEnabled(true);
       }
}
}