Your own Applet runtime environment : Applet « Swing JFC « Java

Your own Applet runtime environment

import java.applet.Applet;
import java.applet.AppletContext;
import java.applet.AppletStub;
import java.applet.AudioClip;
import java.awt.Button;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Panel;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;

public class MainClass extends Applet implements ActionListener {
  static MainClass myApplet;

  static MyStub myStub;

  Image im;

  public void init() {
    System.out.println("Code base = " + getCodeBase());
    System.out.println("Document base = " + getDocumentBase());

    System.out.println("\ninit () called");
    System.out.println("isActive () returns " + isActive());

    Button b = new Button("Visit");

    b = new Button("Audio");

    String imageName = getParameter("image");

    if (imageName != null)
      im = getImage(getCodeBase(), imageName);

  public void start() {
    System.out.println("start () called");
    System.out.println("isActive () returns " + isActive());

  public void paint(Graphics g) {
    if (im != null)
      g.drawImage(im, 0, 0, this);

  public void actionPerformed(ActionEvent e) {
    if (e.getActionCommand().equals("Audio")) {
      String soundName = getParameter("audio");

      if (soundName != null) {
        AudioClip ac = getAudioClip(getDocumentBase(), soundName);;


    try {
      URL u = new URL("");
    } catch (MalformedURLException exc) {

  public void stop() {
    System.out.println("stop () called");
    System.out.println("isActive () returns " + isActive());

  public void destroy() {
    System.out.println("destroy () called");
    System.out.println("isActive () returns " + isActive());

  public static void main(String[] args) {
    Frame frame = new Frame("AppletAndApp as an Application");
    myApplet = new MainClass();

    frame.add(new Panel().add(myApplet));


    myApplet.setStub(myStub = new MyStub(args));

    frame.setSize(300, 200);


    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent w) {

class MyStub implements AppletStub {
  private boolean active = false;

  private Hashtable ht = new Hashtable();

  private MyContext context;

  MyStub(String[] args) {
    context = new MyContext(); 
    if ((args.length & 1) != 0)

    for (int i = 0; i < args.length; i += 2)
      ht.put(args[i], args[i + 1]);

  public boolean isActive() {
    return active;

  public URL getDocumentBase() {
    URL u = null;

    try {
      u = new URL("file:/C:./x.html");
    } catch (MalformedURLException e) {

    return u;
  public URL getCodeBase() {
    URL u = null;
    try {
      u = new URL("file:/C:./");
    } catch (MalformedURLException e) {

    return u;

  public String getParameter(String name) {
    return (String) ht.get(name);

  public AppletContext getAppletContext() {
    return context;

  public void appletResize(int width, int height) {

  public void setActive(boolean active) { = active;

class MyContext implements AppletContext {
  public AudioClip getAudioClip(URL url) {
    return Applet.newAudioClip(url);
  public Image getImage(URL url) {
    Toolkit tk = Toolkit.getDefaultToolkit();
    return tk.getImage(url);

  public Applet getApplet(String name) {
    return null;

  public Enumeration getApplets() {
    return null;

  public void showDocument(URL url) {
    System.out.println("Showing document " + url);

  public void showDocument(URL url, String frame) {
    try {
      showDocument(new URL(url.toString() + frame));
    } catch (MalformedURLException e) {

  public void showStatus(String message) {

  public void setStream(String key, InputStream stream) throws IOException {

  public InputStream getStream(String key) {
    return null;

  public Iterator<String> getStreamKeys() {
    return null;


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