SWTJface 怎么获取ImageDescriptor

SWTJface 如何获取ImageDescriptor Bundle bundle (Bundle) FrameworkUtil.getBundle(this.getClass())

SWTJface 如何获取ImageDescriptor
 Bundle bundle = (Bundle) FrameworkUtil.getBundle(this.getClass());
 URL url = FileLocator.find(bundle, new Path("icons/alt_window_32.gif"), null);
 ImageDescriptor image1 = ImageDescriptor.createFromURL(url);