java panel with background image in swing

Following code show how to display background image on a JPanel

public class ImageTest {
public static void main(String[] args) {
ImagePanel panel = new ImagePanel(new ImageIcon("images/img.png").getImage());
JFrame frame = new JFrame();
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
}
}

class ImagePanel extends JPanel {

private Image img;

public ImagePanel(String img) {
this(new ImageIcon(img).getImage());
}

public ImagePanel(Image img) {
this.img = img;
Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));
setPreferredSize(size);
setMinimumSize(size);
setMaximumSize(size);
setSize(size);
setLayout(null);
}

public void paintComponent(Graphics g) {
g.drawImage(img, 0, 0, null);
}

}

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