second commit

src/ChatRoomGUI.java

@@ -23,9 +23,16 @@ public class ChatRoomGUI extends JFrame{
         this.add(messagebox,BorderLayout.PAGE_END);
 
         ParticipantsArea participantsArea = new ParticipantsArea();
-        this.add(participantsArea,BorderLayout.WEST);
+        this.add(new JScrollPane(participantsArea),BorderLayout.WEST);
+        participantsArea.addNewParticipant("akbar");
+        participantsArea.removeParticipant("akbar");
+        participantsArea.addNewParticipant("ali");
+        participantsArea.addNewParticipant("asghar");
+
         this.setVisible(true);
 
+
+
     }
 
 }
\ No newline at end of file

src/ParticipantsArea.java

 import javax.swing.*;
 import java.awt.*;
-import java.util.ArrayList;
 import javax.swing.JList;
 
 public class ParticipantsArea extends JPanel {
-
+    DefaultListModel model;
+    JList userslist;
 
     public ParticipantsArea(){
 
+        super();
         JLabel label = new JLabel("online users");
-        add(label, BorderLayout.NORTH);
-
+        add(label, BorderLayout.PAGE_START);
+        this.setLayout(new GridLayout(10,1));
+        model = new DefaultListModel();
+        userslist = new JList(model);
+        this.add(userslist,BorderLayout.CENTER);
     }
-    DefaultListModel model = new DefaultListModel();
-    JList userslist = new JList(model);
+
 
     public void addNewParticipant(String userName){
         if(!model.contains(userName))
         model.addElement(userName);
+//        System.out.println(model);
 
     }
     public void removeParticipant(String userName){