求大神，引用图片显示不出来

[liqin1989]

初学者，遇到问题了，求大神解决，运行后，显示出来的窗口是空白的
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;

import javax.annotation.Generated;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Frame {
public static void main(String[] args){
JFrame fa=new JFrame();
fa.setBounds(0, 0, 800, 600);
fa.setVisible(true);
fa.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Hb fb = new Hb();
fa.add(fb);
}
}
class Hb extends JPanel{
public void paint(Graphics g ){
Image img = new ImageIcon("aa.jpg").getImage();
g.drawImage(img, 400, 400,this);

}
}