Start with good (?) Version.

Just adding MenuBar does not show?

src/part5/Demo.java

@@ -2,9 +2,13 @@ package part5;
 
 public class Demo {
     public static void main(String[] args) {
-        for (int i = 0; i < 2; i++) {
+//        for (int i = 0; i < 2; i++) {
-            Window w = new Window("My Java GUI");
+//            Window w = new Window("My Java GUI");
-            w.display();
+//            w.display();
-        }
+//        }
+
+
+        aufg gudWindow = new aufg("Title", 300, 420);
+        gudWindow.display(true);
     }
 }

src/part5/aufg.java

@@ -0,0 +1,64 @@
+package part5;
+
+import javax.management.remote.JMXAddressable;
+import javax.swing.*;
+import java.util.random.RandomGenerator;
+
+public class aufg {
+    private String title;
+    private int height;
+    private int width;
+    private JFrame window;
+    private JPanel contentPane;
+    private JMenuBar menubar;
+
+    public aufg(String title, int height, int width){
+        this.title = title;
+        this.width = width;
+        this.height = height;
+        this.window = new JFrame();
+        this.contentPane = new JPanel();
+        this.menubar = new JMenuBar();
+    }
+
+    public void display(boolean exitOnClose){
+        this.window.setTitle(this.title);
+        this.window.setSize(this.width, this.height);
+        this.window.setVisible(true);
+
+        if (exitOnClose){
+            this.window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        }
+    }
+
+    public void addMenuBar(){
+        JMenu file = new JMenu("File");
+        JMenuItem fileOpen = new JMenuItem("Open");
+        JMenuItem fileEdit = new JMenuItem("Edit");
+        JMenuItem fileClose = new JMenuItem("Close");
+        file.add(fileOpen);
+        file.add(fileEdit);
+        file.add(fileClose);
+
+        JMenu help = new JMenu("Help");
+        JMenuItem helpInfo = new JMenuItem("Info");
+        JMenuItem helpUnsub = new JMenuItem("Unsubscribe");
+        help.add(helpInfo);
+        help.add(helpUnsub);
+
+        JMenu english = new JMenu("English");
+        JMenuItem englishChangeTo = new JMenuItem("Change to English");
+        english.add(englishChangeTo);
+
+        JMenu braile = new JMenu("Braile");
+        JMenuItem braileChangeTo = new JMenuItem("Change to Braile");
+        braile.add(braileChangeTo);
+
+        this.menubar.add(file);
+        this.menubar.add(help);
+        this.menubar.add(english);
+        this.menubar.add(braile);
+
+        this.window.setJMenuBar(this.menubar);
+    }
+}