How to create the Main menu using Java

In this tutorials will teach how to create the main menu using java by code with out drag and drop.

This is the code which we use to create the Main Menu by code

import java.awt.Dimension;
import java.awt.Frame;
import java.awt.MenuBar;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.*;
import java.awt.event.*;


public class Main extends Frame implements ActionListener {

    
 public Main()
{
    super("Menu");
    Dimension screensize=Toolkit.getDefaultToolkit().getScreenSize();
    setSize(screensize);
    setBackground(Color.black);
    setLayout(null);
    setResizable(false);

MenuBar mb = new MenuBar();
setMenuBar(mb);

Menu maintenance = new Menu("Maintenance");
mb.add(maintenance);

MenuItem add1 = new MenuItem("Employee");
maintenance.add(add1);
add1.addActionListener(this);

MenuItem edit1 = new MenuItem("Ammendment");
maintenance.add(edit1);
edit1.addActionListener(this);

MenuItem del1 = new MenuItem("Deletion");
maintenance.add(del1);
del1.addActionListener(this);

MenuItem inq1 = new MenuItem("Inquire");
maintenance.add(inq1);
inq1.addActionListener(this);


MenuItem exit = new MenuItem("Exit");
maintenance.add(exit);
exit.addActionListener(this);
}
 @Override
public void actionPerformed(ActionEvent e)
{

    
String s= e.getActionCommand();
if (s.equals("Employee"))
{
    Empl A1= new Empl();
    A1.show();
}




else if (s.equals("Exit"))
{
System.exit(0);
}

}

public static void main(String args[])
{
Main mm = new Main();
mm.show();
}

}