I have a general idea on how to start. I would need a gui with a screen to display the text and a JTextField to write the text and a send button. I would also need to import the java.new package to connect between the computers, but other then that I am stuck. What whould I do from then on.

Thanks for the help.

It will be easier to design a chatroom over applet, if you want to make a chat room in java desktop then you have to learn java tcp and udp connection , because you have to communicate with your fellow computer's...