Thread: Modification of chat client program

I have been given an assignment which i pretty much don't understand and i need your help please

this is the question. (There's a zip file that contains the code to be modified)

a) Extend the chat client as described above so that if a message contains the string ".mp3" this will be replaced by a music icon. For simplicity you ma y assume that this string will never appear twice in the same message,
or occur in the same message as the string that will be replaced by a smiley.

b) , change the client code to point to the URL of the remote chat server at The Open University, and have a conversation with a fellow student or students.
So you are likely to have someone to talk to when you connect to the server, we suggest t hat you try between 5 pm and 1 0pm, during the weeks 19 April to 26 April or 14 June to 21 June. If you cannot make these times then you can use the M362 discussion forum on FirstClass to arrange to meet a fellow student at a more convenient time.
In your Solutions Document include a screenshot showing a chat conversation with a fellow student and demonstrating that the music icon is correctly displayed.

yeah i looked through the code and also your suggestion.

but i still don't get how to make this icon appear and where exactly add that if statement

/*
 * ChatClientImpl.java
 *
 * Created on 06 February 2007, 23:15
 *
 */
 
package guiclient;
 
//import java.awt.event.*;
//import javax.swing.*;
//import java.io.*;
//import java.net.*; 
 
/**
 *
 * @author m362 Course Team
 */
public class ChatClientImpl implements ChatClient
{
   ChatRoom room;
   GUIChatFrame frame;
 
   public ChatClientImpl(ChatRoom room)
   {
      this.room = room;
      frame = new GUIChatFrame(room, (ChatClient) this);
      frame.setTitle("M362 Chat Room");
      frame.setVisible(true);
      frame.setAlwaysOnTop(true);
   }
 
   public void output(String newmessage)
   {
      if (frame == null)
         return;
      frame.setOutputText(newmessage);
   }
 
   public void run()
   {
      if (room == null)
         return;
      while (true)
      {
         try
         {
            String newmessage = room.receive();
            if (newmessage != null)
            {
               if (!newmessage.equals(""))
                  output(newmessage);
            }
         }
         catch (Exception e)
         {
            System.out.println("Communication problem");
         }
      }
   }
}