java小程序映像未加载

Question

我正在尝试将一个图像加载到我的Java小程序中，我尝试了几种方法，但是图像仍然没有出现在小程序中

这是我的密码：

public class BackgroundApplet extends Applet {
   Image backGround;
   Image fish;

   public void init() {
       // set the size of the applet to the size of the background image.
       // Resizing the applet may cause distortion of the image.
       setSize(300,300);
       // Set the image name to the background you want. Assumes the image is in 
       // the same directory as the class file is
       backGround = getImage(getCodeBase(),"underwater.jpg");
       BackGroundPanel bgp = new BackGroundPanel();
       bgp.setLayout(new FlowLayout());
       bgp.setBackGroundImage(backGround);
       // set the layout of the applet to Border Layout
       setLayout(new BorderLayout());
       // now adding the panel, adds to the center(by default in Border Layout) of the applet
       add(bgp);

       fish = getImage(getCodeBase(), "fish.jpg");
   }

   public void paint(Graphics g)
   {
       // Attempt 1
       g.drawImage(fish,20,20,this);
       // Attempt 2
       ImageIcon img = new ImageIcon("fish.jpg");
       img.paintIcon(this, g, 20,20);
       // Attempt 3
       Image image = img.getImage();
       g.drawImage(image, 50, 50, this);
   }}

如您所见，我还将一个背景图像加载到我的小程序中，显示得很好。可能是鱼在背景图像后面装载

感谢您的帮助，谢谢

**不相关注意：当我实现Runnable界面时（因为我想在背景图像上有动画），当我运行小程序时，背景图像突然不出现。还有什么建议吗