This document describes the components of a group chat system, including a server core component, client core component, and their subclasses. The server core component includes a chat server and server dispatcher. The client core component includes classes for client info, client listener, and client sender. The chat client establishes a connection to the chat server to send and receive messages.

1. Group Communication
Chat System

2. There are two side in this application
1. Server core component
2. Client core component

3. Server core component
Chat Server
+Listening_port : int
+main : void
+addClient : void
+deleteClient : void
+DishPatchMessage : void
+run : void
-MessageQueue : Vector
-Client : Vector
-ServerDispatcher : ClientServer
nextMessageFromQueue : String
Server dispatcher
1 1

4. Client Handler component
Client Info
+socket : Socket
+ClientListener : ClientListener
+ClientSender : ClientSender
+main : void
+ClientListener
+run : void
-serverDispatcher : serverDispatcher
-ClientInfo : ClientInfo
-min : BufferedReader
nextMessageFromQueue : String
ClientListener
ClientSender

5. Con..
+ClientSender
+SendMesssage : void
-sendMessageToClient : void
+run : void
-MessageQueue : Vector
ClientInfo : ClientInfo
Out : printOuter
nextMessageFromQueue : String
ClientSender

6. Client
Chat Client
+Server_HostName : String
+Server_port : int
+main : void
+Sender
+run : void
-out : PrintWriter
Sender

7. Server core component
Chat Server Server dispatcher
1 1
Client handler component
Client Info
Client Listener Client Sender
1
1
1
1
1
1
1
1
Chat Client Sender
1
0..*
0..*
Client

8. Thank You . . .