done

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_10" default="false" project-jdk-name="11" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file

.idea/modules.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/lab10.iml" filepath="$PROJECT_DIR$/lab10.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file

lab10.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file

src/ChatArea.java

+import javax.swing.*;
+
+
+ class ChatArea extends JTextArea {
+    private static final int ROWS = 10, COLUMNS = 30;
+
+    public ChatArea() {
+        super(ROWS, COLUMNS);
+        this.setEditable(false);
+        this.setLineWrap(true); }
+
+        public void addMassage(){}
+ }
\ No newline at end of file

src/ChatRoomGUI.java

+
+
+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;
+
+    public ChatRoomGUI() {
+        super();
+        this.setTitle(WINDOWS_TITLE);
+        this.setLayout(new BorderLayout());
+        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        this.setSize(WIDTH, HEIGHT);
+        this.setLocation(X, Y);
+        MAssagePanel mAssagePanel=new MAssagePanel();
+        this.add(mAssagePanel,BorderLayout.PAGE_END);
+        ChatArea chatBox = new ChatArea();
+        this.add(new JScrollPane(chatBox), BorderLayout.CENTER);
+        USernamePanle uSernamePanle=new USernamePanle();
+        this.add(uSernamePanle,BorderLayout.LINE_START);
+        this.setVisible(true);
+    }
+}
\ No newline at end of file

src/MAssagePanel.java

+import javax.swing.*;
+import java.awt.*;
+
+public class MAssagePanel extends JPanel {
+
+    public MAssagePanel() {
+        this.setLayout(new BorderLayout());
+        JTextField textField= new JTextField();
+        JButton jButton=new JButton("Send Massage");
+        this.add(textField,BorderLayout.CENTER);
+        this.add(jButton,BorderLayout.EAST);
+        this.setVisible(true);
+    }
+}

src/Main.java

+import javax.swing.*;
+
+public class Main {
+
+
+    public static void main(String[] args) {
+        ChatRoomGUI chatRoomGUI=new ChatRoomGUI();
+
+    }
+}

src/MessageArea.java

+public class MessageArea {
+}

src/ParticipantsArea.java

+public class ParticipantsArea {
+}

src/USernamePanle.java

+import javax.swing.*;
+import java.awt.*;
+
+public class USernamePanle extends JPanel {
+
+    public USernamePanle(){
+//        JPanel jFrame=new JPanel();
+        this.setLayout(new GridLayout(5,1));
+        DefaultListModel<String> l1 = new DefaultListModel<>();
+        l1.addElement("online people");
+        l1.addElement("Item1");
+        l1.addElement("Item2");
+        l1.addElement("Item3");
+        l1.addElement("Item4");
+        JList<String> list = new JList<>(l1);
+        this.add(list);
+
+    }
+
+
+
+}

src/UserNameFrame.java

+
+import javax.swing.*;
+import java.awt.*;
+
+public class UserNameFrame extends JFrame {
+    private static final String BTN_TXT = " Start Chatting ...";
+    private static final String LABEL_TXT = " Choose Your UserName ";
+    private static final int WIDTH = 300, HEIGHT = 100;
+    JTextField textField;
+    JButton btn;
+
+    public UserNameFrame() throws HeadlessException {
+        super();
+        this.setLayout(new BorderLayout());
+        JLabel label = new JLabel("Choose Your UserName");
+        add(label, BorderLayout.PAGE_START);
+        textField = new JTextField();
+        add(textField, BorderLayout.CENTER);
+        btn = new JButton(LABEL_TXT);
+        add(btn, BorderLayout.PAGE_END);
+        setSize(WIDTH, HEIGHT);
+        setVisible(true);
+    }
+}
\ No newline at end of file