Problems with running applet from Java Tutorial

Question

Hello
I'd like to compile applet from Lesson Applets, trail: Deployment, title of lesson: A Simple Network Client Applet. But at the beginning of the source code is written that it will work only with: JavaSE 5 version.
* SwingWorker can be downloaded at:
* https://swingworker.dev.java.net/
* SwingWorker must be downloaded for JavaSE 5, but will be included
* in JavaSE 6.
Well, does anyone know about applet doing the same thing which would work in older versions of JDK?. Do I necessarily have to install JavaSE6?. I have J2EE 1.4SDK and I run into errors compiling this example.
Cheers
Message was edited by:
macmacmac

Answer 1

I've got another applet which was written for version 1.1 of Java. It compiles but when I run it, instead of letters of quote I get rectangles, positioned one next to the other. So I can't read the quote. What's wrong with this applet?. Here's the code of it:
* 1.1 version.
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.util.*;
public class QuoteClientApplet3 extends Applet
implements ActionListener {
boolean DEBUG = false;
InetAddress address;
TextField portField;
Label display;
DatagramSocket socket;
public void init() {
//Initialize networking stuff.
String host = getCodeBase().getHost();
try {
address = InetAddress.getByName(host);
} catch (UnknownHostException e) {
System.out.println("Couldn't get Internet address: Unknown host");
// What should we do?
try {
socket = new DatagramSocket();
} catch (IOException e) {
System.out.println("Couldn't create new DatagramSocket");
return;
//Set up the UI.
GridBagLayout gridBag = new GridBagLayout();
GridBagConstraints c = new GridBagConstraints();
setLayout(gridBag);
Label l1 = new Label("Quote of the Moment:", Label.CENTER);
c.anchor = GridBagConstraints.SOUTH;
c.gridwidth = GridBagConstraints.REMAINDER;
gridBag.setConstraints(l1, c);
add(l1);
display = new Label("(no quote received yet)", Label.CENTER);
c.anchor = GridBagConstraints.NORTH;
c.weightx = 1.0;
c.fill = GridBagConstraints.HORIZONTAL;
gridBag.setConstraints(display, c);
add(display);
Label l2 = new Label("Enter the port (on host " + host
+ ") to send the request to:",
Label.RIGHT);
c.anchor = GridBagConstraints.SOUTH;
c.gridwidth = 1;
c.weightx = 0.0;
c.weighty = 1.0;
c.fill = GridBagConstraints.NONE;
gridBag.setConstraints(l2, c);
add(l2);
portField = new TextField(6);
gridBag.setConstraints(portField, c);
add(portField);
Button button = new Button("Send");
gridBag.setConstraints(button, c);
add(button);
portField.addActionListener(this);
button.addActionListener(this);
public Insets getInsets() {
return new Insets(4,4,5,5);
public void paint(Graphics g) {
Dimension d = getSize();
Color bg = getBackground();
g.setColor(bg);
g.draw3DRect(0, 0, d.width - 1, d.height - 1, true);
g.draw3DRect(3, 3, d.width - 7, d.height - 7, false);
void doIt(int port) {
DatagramPacket packet;
byte[] sendBuf = new byte[256];
packet = new DatagramPacket(sendBuf, 256, address, port);
try { // send request
if (DEBUG) {
System.out.println("Applet about to send packet to address "
+ address + " at port " + port);
socket.send(packet);
if (DEBUG) {
System.out.println("Applet sent packet.");
} catch (IOException e) {
System.out.println("Applet socket.send failed:");
e.printStackTrace();
return;
packet = new DatagramPacket(sendBuf, 256);
try { // get response
if (DEBUG) {
System.out.println("Applet about to call socket.receive().");
socket.receive(packet);
if (DEBUG) {
System.out.println("Applet returned from socket.receive().");
} catch (IOException e) {
System.out.println("Applet socket.receive failed:");
e.printStackTrace();
return;
String received = new String(packet.getData());
if (DEBUG) {
System.out.println("Quote of the Moment: " + received);
display.setText(received);
public void actionPerformed(ActionEvent event) {
int port;
try {
port = Integer.parseInt(portField.getText());
doIt(port);
} catch (NumberFormatException e) {
//No integer entered. Should warn the user.
}