Help creating an applet

Question

I need to create an applet from a standalone chat client.
Can someone please help me, or suggest some good tutorials about writing applets?
TIA,
Richie.
------------------------BEGIN---------------------------
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import javax.swing.*;
public class Client
extends JPanel {
public static void main(String[] args) throws IOException {
String name = args[0];
String host = args[1];
int port = Integer.parseInt(args[2]);
final Socket s = new Socket(host, port);
final Client c = new Client(name, s);
JFrame f = new JFrame("Client : " + name);
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
c.shutDown();
System.exit(0);
f.setSize(300, 300);
f.setLocation(100, 100);
f.setContentPane(c);
f.setVisible(true);
private String mName;
private JTextArea mOutputArea;
private JTextField mInputField;
private PrintWriter mOut;
public Client(final String name, Socket s)
throws IOException {
mName = name;
createUI();
wireNetwork(s);
wireEvents();
public void shutDown() {
mOut.println("");
mOut.close();
protected void createUI() {
setLayout(new BorderLayout());
mOutputArea = new JTextArea();
mOutputArea.setLineWrap(true);
mOutputArea.setEditable(false);
add(new JScrollPane(mOutputArea), BorderLayout.CENTER);
mInputField = new JTextField(20);
JPanel controls = new JPanel();
controls.add(mInputField);
add(controls, BorderLayout.SOUTH);
mInputField.requestFocus();
protected void wireNetwork(Socket s) throws IOException {
mOut = new PrintWriter(s.getOutputStream(), true);
final String eol = System.getProperty("line.separator");
new Listener(s.getInputStream()) {
public void processLine(String line) {
mOutputArea.append(line + eol);
mOutputArea.setCaretPosition(
mOutputArea.getDocument().getLength());
protected void wireEvents() {
mInputField.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
String line = mInputField.getText();
if (line.length() == 0) return;
mOut.println(mName + " : " + line);
mInputField.setText("");
------------------------------END------------------------------

Answer 1

Thank you, that was very helpful info. I am new to java, so I find this exercise really touch. Here is what I have so far:
-------------------------BEGIN-------------------------
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.applet.*;
import javax.swing.*;
public class Client extends Applet implements ActionListener {
     String name;
     String host;
     int port;
     final Socket s;
     final Client c;
     Button sendButton;
     TextField txtField;
     TextArea txtArea;
public void init() {
          setLayout(new FlowLayout());
          name = "Richard";
          host = InetAddress.getLocalHost();
          port = 8000;
          Socket s = new Socket(host, port);
          Client c = new Client(name, s);
          txtField = new TextField();
          sendButton = new Button("Send");
          txtArea = new TextArea("Chat with " + name + " on " + host " : " + port);
          add(txtArea);
          add(txtField);
          add(sendButton);
     sendButton.addActionListener(this);
public void paint(Graphics g) {
     g.setColor(Color.red);
     g.drawString("<" + name + "> " + txtField.getText(),20,250);
public void actionPerformed(ActionEvent evt) {
if (evt.getSource() == sendButton)
          repaint();
          txtArea.setText(txtField.getText());
private String mName;
private TextArea mOutputArea;
private TextField mInputField;
private PrintWriter mOut;
public Client(final String name, Socket s)
throws IOException {
mName = name;
createUI();
wireNetwork(s);
wireEvents();
public void shutDown() {
mOut.println("");
mOut.close();
protected void createUI() {
setLayout(new BorderLayout());
mOutputArea = new TextArea();
mOutputArea.setLineWrap(true);
mOutputArea.setEditable(false);
add(new JScrollPane(mOutputArea), BorderLayout.CENTER);
mInputField = new TextField(20);
JPanel controls = new JPanel();
controls.add(mInputField);
add(controls, BorderLayout.SOUTH);
mInputField.requestFocus();
protected void wireNetwork(Socket s) throws IOException {
mOut = new PrintWriter(s.getOutputStream(), true);
final String eol = System.getProperty("line.separator");
new Listener(s.getInputStream()) {
public void processLine(String line) {
mOutputArea.append(line + eol);
mOutputArea.setCaretPosition(
mOutputArea.getDocument().getLength());
protected void wireEvents() {
mInputField.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
String line = mInputField.getText();
if (line.length() == 0) return;
mOut.println(mName + " : " + line);
mInputField.setText("");