Listing 1.
    public void init() {

        super.init();

chatLogFileName = getParameter("logfile") != null ? getParameter("logfile") :"chatlog";
 
        cgiPath = getParameter("cgipath") != null ? getParameter("cgipath") : "cgi-bin/";

chatScreen = new ChatPanel(this,chatLogFileName);

        setLayout(new BorderLayout());
        add("Center",chatScreen);

    }
Listing 2.
public class ChatPanel extends Panel implements Runnable{

    ChatPanel(Applet app,String fileName) {

        super();
        this.app = app;
        chatFileName = fileName;
        //Build the Setup Panel
        Panel setup = new Panel();
        Panel setupNorth = new Panel();
        Panel setupCenter = new Panel();
        Panel setupSouth = new Panel();
        setup.setBackground(Color.cyan);
        setupButton = new Button("Enter Chat Room");
        nameField = new TextField(20);
        nameField.setBackground(Color.white);
        setupCenter.add(new Label("Enter Name:"));
        setupCenter.add(nameField);
        setupCenter.add(setupButton);
        setupNorth.setFont(new Font("TimesRoman",Font.BOLD,36));
        setupNorth.add(new Label("Welcome to Chat"));
        setupSouth.setFont(new Font("TimesRoman",Font.BOLD,36));
        setupSouth.add(new Label("You Must Enter A Chat Name"));
        setup.setLayout(new BorderLayout());
        setup.add("North", setupNorth);
        setup.add("Center", setupCenter);
        setup.add("South", setupSouth);
        //Build the Chat Panel
        Panel chat = new Panel();
        chat.setBackground(Color.black);
        chat.setLayout(new BorderLayout(10,10));
        northPanel = new Panel();
        southPanel = new Panel();
        northPanel.setBackground(Color.cyan);
        northPanel.setFont(new Font("TimesRoman", Font.BOLD,24));
        northPanel.add(new Label("Joseph DiBella's Cyber-Chatterbox"));
        chat.add("North", northPanel);
        chatArea = new TextArea("Welcome to Joe DiBella\'s Chat Applet\n\n");
        chatArea.setEditable(false);
        chatArea.setBackground(Color.cyan);
        chatArea.setForeground(Color.black);
        chatArea.setFont(new Font("Helvetica", Font.BOLD,14));
        chat.add("Center",chatArea);
        chatLine = new TextField();
        chatLine.setBackground(Color.white);
        sendButton = new Button("Send");
        southPanel.setLayout(new BorderLayout(5,5));
        southPanel.add("Center",chatLine);
        southPanel.add("East", sendButton);
        chat.add("South", southPanel);

        clayout=new CardLayout();
        setLayout(clayout);
        add("Setup", setup);
        add("Chat", chat);
 

    }

Listing 3
    public void start(){
        if(identity != null){
            new SubmitToChatServer("*** "+identity+" Has Entered This Chat Room. ***",app,chatFileName).start();
            if(runner == null){
                runner=new Thread(this);
                runner.start();
            }
        }else{
            clayout.show(this,"Setup");
            nameField.requestFocus();
        }
    }

Listing 4.
    public void run(){

        chatLine.requestFocus();
        // Figure out line length in pixels
        FontMetrics fm = chatArea.getFontMetrics(chatArea.getFont());
        aveChar = fm.stringWidth("ABCDEFGHIJKLMNOPQRSTUVWXYZ
     abcdefghijklmnopqrstuvwxyz  .. .. ")/62;
        aveCharsPerLine = this.size().width/aveChar;

        // Start the chat engine
        while(true){
            refresh();
            try{
                Thread.sleep(refreshTime);
            }catch(InterruptedException e){}

        }

    }

Listing 5.
void refresh(){

            try{
                log = new URL(app.getDocumentBase(),chatFileName+".log");

                DataInputStream din = new DataInputStream(log.openStream());

                String tempLastLine=lastLine;
                String in="";
                String chatData = "";
                boolean first = true;
                boolean finished = false;

                while((in=din.readLine())!=null){

                    if(in.startsWith(lastLine)){
                        finished = true;
                    }
                    if(!finished){
                        if(first){
                                tempLastLine=in;
                                first=false;
                        }

                         chatData = processText(in)+chatData;
                    }

                 }

                  chatArea.appendText(chatData);
                  lastLine=tempLastLine;
                  din.close();

            }catch(Exception e){
                System.out.println("Error in refresh:" + e.toString());

            }
            // Force the Text Area to scroll to the end
            chatArea.select(chatArea.getText().
               length(),chatArea.getText().length());
 

    }

Listing 6.
    String processText(String text){
        /* This method is responsible for word wrapping in the text area. If a line is longer than
           the width of the Text area, we will insert a new-line chatacter in place of a space */
        int textLength = text.length();
        if(textLength <= aveCharsPerLine){
            return text+"\n\n";
        }
        // We will need the name of the person if we need to wrap. This extracts that info
        String chatName = text.substring(0,text.indexOf(">:")+2);
        String processedText = "";

        while(text.length() > aveCharsPerLine){
            int i = text.lastIndexOf((int)' ',aveCharsPerLine);
            try{
                processedText += text.substring(0,i)+"\n";
                text = chatName + text.substring(i);
            }catch(Exception e){/* code for exception*/
                System.out.println("Error processing text:" + e.toString());

            }
        }

        return processedText+text+"\n\n";

    }

Listing 7.
    public boolean handleEvent(Event event) {
        if (event.id == Event.ACTION_EVENT && (event.target == sendButton||event.target == chatLine)) {
                sendChat();
                chatLine.requestFocus();
                return true;
        }
        if (event.id == Event.ACTION_EVENT && (event.target == setupButton||event.target == nameField)){
             if(nameField.getText().equals("")){
                app.showStatus("You must enter a name");
                nameField.requestFocus();

            }else{
                app.showStatus("Entering Chat Room");
                setIdentity(nameField.getText());
                clayout.show(this,"Chat");
                start();
            }
            return true;
        }

        return super.handleEvent(event);
    }

Listing 8.
    public void setRefreshTime(int i){
        refreshTime = i;
    }

    public void setIdentity(String i){
        identity = i;

    }
    public String getIdentity(){
        return identity;
    }
    public void setChatLogName(String i){
        chatFileName = i;
    }

    //{{DECLARE_CONTROLS
    private TextArea chatArea;
    private TextField chatLine;
    private Panel northPanel, southPanel;
    private Button sendButton;
    private Applet app;
    private int refreshTime = 10000;
    private int aveChar, aveCharsPerLine, chatSize;
    private String identity = null;
    private String chatFileName = "chatlog";
    private URL log;
    private String lastLine=" ";
    private Thread runner;
    private Button setupButton;
    private TextField nameField;
    private CardLayout clayout;
        //}}
}