design gui multithread chat room

I want to implement a chat room application using the client/server architecture. The server is a relaying server which allows to dispatch any received message to all the clients in the chat room. The client allows the user to write and send messages to the chat room (to the server) and to print any received message from the server (sent by another client via the server). # must implements the client using a Graphical User Interface (Widgets, controls, etc.) # the code should be very simple not complex including comments . #no Database needed .