Create an application with a square window Using Swing - Creating Menu Part 3

 Add a menu bar containing the items File, Edit, Window, and Help. to Following Example

Create an application with a square window Using Swing Part 2

import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import java.awt.Toolkit;
import java.awt.Dimension;
import java.awt.BorderLayout;

@SuppressWarnings("serial")
public class SquareWindow extends JFrame {
  public SquareWindow(String title) {
    super(title);

    Toolkit theKit = this.getToolkit();
    Dimension wndSize = theKit.getScreenSize();

    // Calculate window side length as half the screen height
    int size = wndSize.height/2;

    setBounds((wndSize.width - size)/2, (wndSize.height-size)/2,   // Position
                           size, size);                         // Size
    addButtons();                                 // Add the buttons to the window
    addMenu();                               // Add the menubar & menus
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setVisible(true);
  }

  // Creates and adds the buttons to the content pane
  public void addButtons() {
      Box vBox = Box.createVerticalBox();  // Create a box to hold the buttons

      vBox.add(Box.createVerticalStrut(10));       // Start with a strut for spacing
      vBox.add(Box.createVerticalGlue());            // then glue

      // Add the buttons separated by glue
      JButton button = null;;
      for(int i = 1 ; i <= 6 ; i++) {
        vBox.add(button = new JButton("Button" + i));
        vBox.add(Box.createVerticalGlue());
      }
      vBox.add(Box.createVerticalStrut(10));   // Add a strut for end spacing

      // Content pane has BorderLayout by default - add vBox to the WEST
      getContentPane().add(vBox, BorderLayout.WEST);
   }

   public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
            public void run() {
              SquareWindow myWindow = new SquareWindow("http://java-programs"
                              +"-examples.blogspot.com/");
            }
        });
   }

   // Create and add a  menubar
   private void addMenu() {
      JMenuBar menuBar = new JMenuBar();      // Create the menubar

      // Create the menu headings
      JMenu fileMenu = new JMenu("File");
      JMenu editMenu = new JMenu("Edit");
      JMenu windowMenu = new JMenu("Window");
      JMenu helpMenu = new JMenu("Help");

      menuBar.add(fileMenu);
      menuBar.add(editMenu);
      menuBar.add(windowMenu);
      menuBar.add(helpMenu);

      setJMenuBar(menuBar);           // Add the menubar to the window
   }
}

Output of Above Java Program