JMenu Bar does not show unless I resize the window

Question

Hi, I have just a simple problem. I am trying to just have a blank JFrame with a JMenuBar at the top with the JMenu "File". I have the following code, but once I run the application it is just a blank frame with no Menus. Once I grab the frame and resize it with the mouse, it appears. What do I need to do to have the menu bar be shown once the application runs?
import javax.swing.*;
import java.awt.*;
class ProgramWindow extends JFrame
private JMenuBar jmb = new JMenuBar();
private JMenu file = new JMenu("File");
public ProgramWindow()
setSize(300, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setJMenuBar(jmb);
jmb.add(fileMenu);
Container c = getContentPane();
c.setBackground(Color.lightGray);
c.setLayout(new BorderLayout());
setConentPane(c);
public class Program
public static void main (String[] args)
ProgramWindow pw = new ProgramWindow();
}

Answer 1

Normally you poop up and decorate frames/dialogs before you set them
visible. Otherwise you have to revalidate() them after you' ve added
some components to them. (resizing them does that for you as you have
noticed).
kind regards,
Jos