2 classes created

src/ChatArea.java

+import javax.swing.*;
+import java.awt.*;
+
+public class ChatArea extends JTextArea {
+    private static final int ROWS = 10, COLUMNS = 30;
+
+    public ChatArea() {
+        super(ROWS, COLUMNS);
+        this.setEditable(false);
+        this.setLineWrap(true);
+        this.setBackground(Color.pink);
+    }
+
+    public void addMessage(String username , String userPost){
+        setLayout(new BorderLayout());
+        insert(" " + username + " _"+userPost , 0 );
+    }
+}

src/ChatRoomGUI.java

-public class ChatRoomGUI {
+import javax.swing.*;
+import java.awt.*;
+
+public class ChatRoomGUI extends JFrame {
+    private final String WINDOWS_TITLE = "Aut Chat Room";
+    private final int WIDTH = 500  , HEIGHT = 500 ;
+    private final int X = 100 , Y = 100 ;
+    private MessageArea messageArea;
+    private ChatArea chatBox;
+    private ParticipantsArea participantsArea;
+    public ChatRoomGUI(){
+        super();
+
+        this.setTitle(WINDOWS_TITLE);
+        this.setLayout(new BorderLayout());
+        ChatArea chatBox = new ChatArea();
+        this.add(new JScrollPane(chatBox), BorderLayout.CENTER);
+        MessageArea messageArea = new MessageArea();
+        this.add(messageArea , BorderLayout.SOUTH);
+        participantsArea = new ParticipantsArea();
+        this.add(participantsArea , BorderLayout.WEST);
+        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        this.setSize(WIDTH,HEIGHT);
+        this.setLocation(X,Y);
+        this.setVisible(true);
+
+    }
+
 }