Dúvida sobre buffered image e gif

package Objects;

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.JFrame;

import com.towel.swing.img.JImagePanel;

public class janela extends JFrame{
  BufferedImage img = null;
  janela(){
  setTitle("Teste com jimagepanel");
  setVisible(true);
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  setLocationRelativeTo(null);
  setExtendedState(JFrame.MAXIMIZED_BOTH);
 
try {
	img = ImageIO.read(getClass().getResource("/Assets/gif.gif"));
} catch (IOException e) {
	e.printStackTrace();
}
JImagePanel panel = new JImagePanel(img);
add(panel);
validate();
}
public static void main(String[]args){
   janela j = new janela();
}
}