i have a file .java as following:

import dnx.lr.*;
import dnx.lr.app.*;
import java.awt.*;
import java.io.IOException;
import java.net.URL;


public class VRMLBrowser extends Frame {

protected ApplicationDocument document;
protected View3D view;


public VRMLBrowser(String title) {
super(title);
setLayout(new BorderLayout(5, 5));
Panel p = new Panel();
p.setLayout(new BorderLayout());
p.add("West", new Label("Location: ", Label.LEFT));
p.add("Center", new TextField());
add("North", p);
}

@Override
public boolean action(Event event, Object arg) {
if (event.target instanceof TextField) {
System.err.println("Loading new URL: " + arg);
try {
readScene((String) arg);
}
catch (VRMLSyntaxException e) {
System.out.println ("Invalid VRML Syntax in file: " + arg);
return false;
}
catch (IOException e) {
System.out.println ("Unable to load: " + e);
return false;
}
return true;
}
return false;
}

@Override
public boolean handleEvent(Event event) {
if (event.id == Event.WINDOW_DESTROY) {
System.exit(0);
}
return super.handleEvent(event);
}

@Override
public Insets insets() {
return new Insets(super.insets().top +5, super.insets().left +5,
super.insets().bottom+5, super.insets().right+5);
}

public void readScene(String arg) throws VRMLSyntaxException,
IOException {
URL url = new URL(ApplicationDocument.getCurrentDirectory(), arg);
Scene scene = new Scene(new ReadAction(url));
ApplicationDocument doc = new ApplicationDocument(scene);
if (view == null) {
document = doc;
view = new BrowserView3D(document);
}
else {
document.stop();
document = doc;
view = new BrowserView3D(document);
add("Center", view.getComponent());
validate();
document.start();
}
}

public static void main(String[] args) {
VRMLBrowser frame = new VRMLBrowser("Minimal VRML Browser");

if (args.length != 1) {
System.err.println("Usage: java VRMLBrowser <url>");
System.exit(0);
}

try {
frame.readScene(args[0]);
}
catch (VRMLSyntaxException e) {
System.out.println ("Invalid VRML Syntax in file: " + args[0]);
return;
}
catch (IOException e) {
System.out.println ("Unable to load: " + e);
return;
}

frame.add("Center", frame.view.getComponent());
frame.resize(440, 340);
frame.show();

frame.document.start();
}
}

i don't know link down packages dnx.lr,... and where classes as ApplicationDocument and View3D are placed.
???
who can help me run this file? hic hic