Java: Need Help with Active Rendering. PLEASE HELP

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

public class PacmanM extends JPanel implements ActionListener
{
	private ImageIcon images[];
	private static final int TOTAL_IMAGES=7, ANIM_DELAY=50;
	private int currentImage = 0;
	private Timer animationTimer;
	private int delay = 0;

	public PacmanM(int delay)
	{
		this.delay = delay;
		setupAnimation();	
	}
	
	public PacmanM()
	{
		setupAnimation();
	}
	
	public void setupAnimation()
	{
		this.setSize(this.getPreferredSize());
		this.images = new ImageIcon[TOTAL_IMAGES];
		
		for (int i = 0; i < images.length; i++)
		{
			images[i] = new ImageIcon("pac"+i+".gif");
		}
		startAnimation();
	}
	
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		g.setColor(Color.blue);
		g.fillRect(0,0,this.getWidth(), this.getHeight());
		if (images[currentImage].getImageLoadStatus() == MediaTracker.COMPLETE)
		{   
			images[currentImage].paintIcon(this, g, 0, 0);
			currentImage = (++currentImage) % TOTAL_IMAGES;
		}	
	}
	
	public void startAnimation()
	{
		if (animationTimer == null)
		{
			currentImage = 0;
			animationTimer = new Timer( ANIM_DELAY + delay, this);
			animationTimer.start();
		} 
		else 
		{
			if (!animationTimer.isRunning())
			animationTimer.restart();
		}
	}
	
	public void stopAnimation (){ animationTimer.stop(); }
	public void actionPerformed(ActionEvent e){ repaint(); }
	public Dimension getMinimumSize() { return getPreferredSize(); }
	public Dimension getPreferredSize (){return new Dimension(400,400);}
	
	public static void main(String[] args )
	{
		PacmanM PacMan = new PacmanM();
		JFrame main = new JFrame("PacMan");
		main.getContentPane().add(PacMan, BorderLayout.CENTER);
		
		main.addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent e)
			{
				System.exit(0);
			}
		});
			main.pack();
			main.show();		
	}    
}