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

 1 public class BackgroundImage extends JFrame
 2 {
 3     public BackgroundImage()
 4     {
 5         this.setTitle("窗体背景图片设置方法");
 6         this.setSize(700, 471);
 7         
 8         JPanel jPanel = new JPanel()
 9         {
10 
11             @Override
12             protected void paintComponent(Graphics g)
13             {
14                 ImageIcon icon = new ImageIcon("images/2.jpg");
15                 g.drawImage(icon.getImage(), 0, 0, BackgroundImage.this.getWidth(), BackgroundImage.this.getHeight(), BackgroundImage.this);
16             }
17             
18         };
19         this.add(jPanel);
20         
21         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
22     }
23 
24     /**
25      * @param args
26      */
27     public static void main(String[] args)
28     {
29         BackgroundImage backgroundImage = new BackgroundImage();
30         backgroundImage.setVisible(true);
31     }
32 
33 }