Java Swing - 如何添加背景图像到JPanel

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import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Main {
  public static void main(String[] args) {
    ImagePanel panel = new ImagePanel(
        new ImageIcon("images/background.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);
 
 
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