how to call a method from another class Java Swing?
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I have the following SwingMenu class.
	package base;
	
	import javax.swing.*;
	
	public class SwingMenu {
		public static void main(String[] args) {
			SwingMenu s = new SwingMenu();
		}
	
		public SwingMenu() {
			JFrame frame = new JFrame(
					"Creating a JMenuBar, JMenu, JMenuItem and seprator Component");
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			JMenuBar menubar = new JMenuBar();
			JMenu filemenu = new JMenu("File");
			filemenu.add(new JSeparator());
			JMenu editmenu = new JMenu("Edit");
			editmenu.add(new JSeparator());
			JMenuItem fileItem1 = new JMenuItem("New");
			JMenuItem fileItem2 = new JMenuItem("Open");
			JMenuItem fileItem3 = new JMenuItem("Close");
			fileItem3.add(new JSeparator());
			JMenuItem fileItem4 = new JMenuItem("Save");
			JMenuItem editItem1 = new JMenuItem("Cut");
			JMenuItem editItem2 = new JMenuItem("Copy");
			editItem2.add(new JSeparator());
			JMenuItem editItem3 = new JMenuItem("Paste");
			JMenuItem editItem4 = new JMenuItem("Insert");
			filemenu.add(fileItem1);
			filemenu.add(fileItem2);
			filemenu.add(fileItem3);
			filemenu.add(fileItem4);
			editmenu.add(editItem1);
			editmenu.add(editItem2);
			editmenu.add(editItem3);
			editmenu.add(editItem4);
			menubar.add(filemenu);
			menubar.add(editmenu);
			frame.setJMenuBar(menubar);
			frame.setSize(400, 400);
			frame.setVisible(true);
		}
	}

And I want to display the Menu by calling it from the this main class.

	package base;
	
	import javax.swing.*;
	
	import java.awt.*;
	import base.SwingMenu;
	
	public class StickyNotes {
	
		private static void createAndShowGUI() {
	
			// Create and set up the window.
			JFrame frame = new JFrame("Java Sticky Notes");
			
			frame.setPreferredSize(new Dimension(5000, 5000));
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			frame.setLayout(new FlowLayout(FlowLayout.LEFT));
	
			// Add Label
			JLabel label = new JLabel("Type Below");
			frame.getContentPane().add(label);
			
			// Add Main Menu
			SwingMenu mainBar = new SwingMenu();
			//frame.setJMenuBar(mainBar);
			//frame.getContentPane().add(mainBar);
	
			// Display the window.
			frame.pack();
			frame.setVisible(true);
		}
	
		public Container createContentPane() {
			// Create the content-pane-to-be.
			JPanel jplContentPane = new JPanel(new BorderLayout());
			jplContentPane.setLayout(new BorderLayout());
			jplContentPane.setOpaque(true);
			return jplContentPane;
		}
	
		public static void main(String[] args) {
			// creating and showing this application's GUI.
			javax.swing.SwingUtilities.invokeLater(new Runnable() {
				public void run() {
					createAndShowGUI();
				}
			});
		}
	}

I just cannot figure it out all morning :) How do I get the Menu Bar to show up in Java Swing?

        // Add Main Menu
        SwingMenu mainBar = new SwingMenu();
