Slika u aplikaciji?

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

public class SlikaWindow extends JFrame {
boolean inAnApplet = true;
private boolean laidOut = false;
private static URL slika;

public SlikaWindow() {

Container cp = getContentPane();
cp.setLayout(null);

slika = getClass().getResource("slika.gif");
JLabel l1 = new JLabel(new ImageIcon(Toolkit.getDefaultToolkit().getImage(slika)),JLabel.CENTER);
cp.add(l1);

Insets insets = cp.getInsets();
l1.setBounds(12 + insets.left, 2 + insets.top, 143, 43);

Toolkit thisScreen = Toolkit.getDefaultToolkit();
Dimension thisScreenSize = thisScreen.getScreenSize();
setSize(thisScreenSize.width,thisScreenSize.height);
setVisible(true);
setTitle("Prikaz slike u aplikaciji");


addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
if (inAnApplet) {
dispose();
} else {
System.exit(0);
}
}
});
}

public static void main(String args[]) {

SlikaWindow window = new SlikaWindow();
Insets insets = window.getInsets();
window.inAnApplet = false;

}
}