Animação

import javax.swing.JPanel;
import javax.swing.ImageIcon;
import javax.swing.Timer;
import java.awt.Graphics;
import java.awt.Dimension;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class LogoAnimatorJPanel extends JPanel
{
    private final String IMAGE_NAME="attack";
    protected ImageIcon images[];
    private final int TOTAL_IMAGES=8;
    private int currentImage=0;
    private final int ANIMATION_DELAY=50;
    private int width,height;
    private Timer animationTimer;

    public LogoAnimatorJPanel()
    {
        images=new ImageIcon[TOTAL_IMAGES];

        for (int i=0;i<images.length;i++)
            images[i]=new ImageIcon(getClass().getResource(IMAGE_NAME+i+".bmp"));

        width=images[0].getIconWidth();
        height=images[0].getIconHeight();
    }
    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);

        images[currentImage].paintIcon(this, g, 0,0);

        if(animationTimer.isRunning())
            currentImage=(currentImage+1)%TOTAL_IMAGES;
    }
    public void startAnimation()
    {
        if(animationTimer==null)
        {
            currentImage=0;

            animationTimer=new Timer(ANIMATION_DELAY,new TimerHandler());

            animationTimer.start();
        }
        else
        {
            if(!animationTimer.isRunning())
                animationTimer.restart();
        }
    }
    public void stopAnimation()
    {
        animationTimer.stop();
    }
    public Dimension getMinimumSize()
    {
        return getPreferredSize();
    }
    public Dimension getPreferredSize()
    {
        return new Dimension(width,height);
    }
    private class TimerHandler implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            repaint();
        }
    }
    
}

import javax.swing.JFrame;

public class LogoAnimatorJPanelTest extends JFrame
{
    public static void main(String args[])
    {
         LogoAnimatorJPanel animation=new LogoAnimatorJPanel();
         JFrame f=new JFrame("Animator Test");
         f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         f.add(animation);
         f.pack();
         f.setVisible(true);
         animation.startAnimation();
    }
}