The JMenuBar class is used to display menubar on the window.JMenuBar, JMenu and JMenuItems are a part of Java Swing package. JMenuBar is used to implement the menubar . The JMenuBar having many JMenu objects, The object of JMenu class is a drop down menu component which is displayed from the menu bar.JMenu basically represents a menu . It contains several JMenuItem Object.

Constructors used with JMenuBar

Basic Methods of JMenuBar class :

import javax.swing.*;
class JMenuDemo extends JFrame
{
JMenuBar jmb;
JMenu menu, submenu;
JMenuItem m1,m2,m3,m4,m5;
JMenuDemo()
{
jmb=new JMenuBar();
menu=new JMenu("Main Menu");
submenu=new JMenu("Sub Menu");
m1=new JMenuItem("First Item");
m2=new JMenuItem("Second Item");
m3=new JMenuItem("Third Item");
m4=new JMenuItem("First Subitem");
m5=new JMenuItem("Second Subitem");
menu.add(m1); menu.add(m2); menu.add(m3);
submenu.add(m4); submenu.add(m5);
menu.add(submenu);
jmb.add(menu);
setJMenuBar(jmb);
setTitle("MenuBar and MenuItem Example");
setSize(400,400);
setLayout(null);
setVisible(true);
}
}

public class JMenuBarExample
{
public static void main(String[] args)
{
JMenuDemo jmenu=new JMenuDemo();
}
}

import javax.swing.*;
import java.awt.event.*;
class MenuDemo extends  JFrame implements ActionListener
{
    JMenuBar mb;
    JMenu file,edit,format,help;
    JMenuItem new1,open,save,saveas,cut,copy,paste,selectAll;
    JTextArea ta;
    MenuDemo()
    {
        new1=new JMenuItem("New");
        open=new JMenuItem("Open");
        save=new JMenuItem("Save");
        saveas=new JMenuItem("Save as");
        cut=new JMenuItem("Cut");
        copy=new JMenuItem("Copy");
        paste=new JMenuItem("Paste");
        selectAll=new JMenuItem("SelectAll");
        cut.addActionListener(this);
        copy.addActionListener(this);
        paste.addActionListener(this);
        selectAll.addActionListener(this);
        mb=new JMenuBar();
        file=new JMenu("File");
        file.setMnemonic(KeyEvent.VK_F);
        edit=new JMenu("Edit");
        format=new JMenu("Format");
        help=new JMenu("Help");
        file.add(new1);file.add(open);file.add(save);file.add(saveas);
        edit.add(cut);edit.add(copy);edit.add(paste);edit.add(selectAll);
        mb.add(file);mb.add(edit);mb.add(help);
        ta=new JTextArea();
        ta.setBounds(5,5,400,400);
        add(mb);add(ta);
        setJMenuBar(mb);
        setTitle("JMenuBar Example");
        setLayout(null);
        setSize(400,400);
        setVisible(true);
    }
    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==cut)
        {
            ta.cut();
        }
        if(e.getSource()==paste)
        {
            ta.paste();
        }
        if(e.getSource()==copy)
        {
            ta.copy();
        }
        if(e.getSource()==selectAll)
        {
            ta.selectAll();
        }
    }
}

public class JMenuBarExample
{
public static void main(String[] args)
{
MenuDemo menu=new MenuDemo();
}
}