java使用URL类定位资源

[bank_boy]

源代码：
import javax.swing.*;
public class DisplayImageWithURL extends JApplet{
public DisplayImageWithURL(){
java.net.URL url=this.getClass().getResource("image//us.jpg");
add(new JLabel(new ImageIcon(url)));
}
}

出现问题：
java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(ImageIcon.java:205)
at DisplayImageWithURL.<init>(DisplayImageWithURL.java:5)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at java.lang.Class.newInstance0(Class.java:374)
at java.lang.Class.newInstance(Class.java:327)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:795)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:724)
at sun.applet.AppletPanel.run(AppletPanel.java:380)
at java.lang.Thread.run(Thread.java:722)



对应的html文件打开时显示不出图片，是什么原因？环境配置么？

[oneleaf]

us.jpg放到生成的class文件所在目录下

[bank_boy]

us.jpg放到生成的class文件所在目录下

好像不是这个原因，我已经把它们放在一起了，不过还是显示出错