add input and output areas in GUI window

src/main/java/ChatClient.java

@@ -7,6 +7,10 @@ public class ChatClient extends JFrame {
     private int port;
     private Socket connectionToServer;
 
+    // GUI
+    private JTextArea outputTextArea;
+    private JTextField inputTextField;
+
     public ChatClient(int port) {
         super("Chat");
         this.port = port;
@@ -18,6 +22,12 @@ public class ChatClient extends JFrame {
     }
 
     private void initGui() {
+        outputTextArea = new JTextArea();
+        inputTextField = new JTextField();
+
+        add(outputTextArea);
+        add(inputTextField);
+
         setVisible(true);
         setSize(800, 600);
         setDefaultCloseOperation(EXIT_ON_CLOSE);