Changed the join method to send over a reference of the ClientUpdate Interface

src/GUI/ChatScreen.java

@@ -48,30 +48,6 @@ public class ChatScreen {
 //        SwingUtilities.getRootPane(sendButton).setDefaultButton(sendButton);
     }
 
-        frame.addWindowListener(new WindowAdapter()
-        {
-            @Override
-            public void windowClosing(WindowEvent arg0)
-            {
-                int answer = JOptionPane.showConfirmDialog(null,
-                        "Are you sure you want to quit the session?",
-                        "Shut down session", JOptionPane.YES_NO_OPTION);
-                System.out.println(answer);
-                if (answer == 0)
-                {
-                    System.out.println("Quitting session");
-                    try
-                    {
-                        client.getClientController().quit(client.getUserName());
-                    }
-                    catch (RemoteException e)
-                    {
-                        e.printStackTrace();
-                    }
-                    System.exit(0);
-                }
-            }
-        });
 
     public JButton getSendButton() {
         return sendButton;