JAVA GUI学习 - 窗体背景图片设置方法：重写paintComponent(Graphics g)方法

public class BackgroundImage extends JFrame
{
    public BackgroundImage()
    {
        this.setTitle("窗体背景图片设置方法");
        this.setSize(700, 471);
        
        JPanel jPanel = new JPanel()
        {

            @Override
            protected void paintComponent(Graphics g)
            {
                ImageIcon icon = new ImageIcon("images/2.jpg");
                g.drawImage(icon.getImage(), 0, 0, BackgroundImage.this.getWidth(), BackgroundImage.this.getHeight(), BackgroundImage.this);
            }
            
        };
        this.add(jPanel);
        
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        BackgroundImage backgroundImage = new BackgroundImage();
        backgroundImage.setVisible(true);
    }

}