JMenu Creation in Java Swing

This program is for the beginners how to create a menu in java swing

1. JMenu creation in swing
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
public class menu_example extends JFrame {
menu_example()
{ setTitle("JMenu application");
setSize(300, 100);
setDefaultCloseOperation(DISPOSE_ON_CLOSE );
JPanel jp=new JPanel();
//menubar creation
JMenuBar jmb=new JMenuBar();
JMenu jm=new JMenu("File");
//submenu creation
JMenuItem jmi=new JMenuItem("open");
jm.add(jmi);
jmb.add(jm);
jp.add(jmb);
getContentPane().add(jp);
}//constructor
public static void main(String[] args) {
menu_example me=new menu_example();
me.setVisible(true);

}
}