import java.awt.event.*;
import javax.swing.*;

// this class contains the method called when the exit choice is picked
class ExitListener implements ActionListener {
    @Override
    public void actionPerformed(ActionEvent e) {
        System.exit(0);
    }
}

public class MenuExample { 
    public static void main(String[] args) {
        JFrame frame = new JFrame("Menu Example!");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // create the menu bar
        JMenuBar menubar = new JMenuBar();

        // add the file menu
        JMenu file = new JMenu("File");
        file.setMnemonic(KeyEvent.VK_F);

        // add a menu item
        JMenuItem exit = new JMenuItem("Exit", null);
        exit.setMnemonic(KeyEvent.VK_E);
        exit.setToolTipText("Exit the program");

        // add the action as a new anonymous object
        exit.addActionListener(new ExitListener());
        file.add(exit);

        // add file to the menubar
        menubar.add(file);

        // add the menubar to the window
        frame.setJMenuBar(menubar);

        // set other things
        frame.setTitle("Simple menu");
        frame.setSize(300, 200);

        // launch the windwo
        frame.setVisible(true);
    }
}