import java.lang.*;
import java.awt.*;
import java.io.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.text.*;
import java.util.*;
 
public class FrameExample{
 
    private JFrame frame;
    private JMenuBar menuBar;
    private JMenu fileMenu;
    private JMenu optionMenu;
    private JMenuItem newFileItem;
    private JMenuItem openFileItem;
    private JMenuItem exitItem;
 
    public FrameExample()
    {
    	frame = new JFrame();
    	menuBar = new JMenuBar();
    	frame.setJMenuBar(menuBar);
 
    	newFileItem=new JMenuItem();
    	newFileItem.setText("New");
    	newFileItem.setToolTipText("Click to open new file");
    	newFileItem.setActionCommand("new");
    	newFileItem.addActionListener(new ActionListener(){
    		public void actionPerformed(ActionEvent ae){
    			JOptionPane.showMessageDialog(frame, "New File Chosen","New File", JOptionPane.CANCEL_OPTION);
    			/*Be carefull with declaration you used only 3 arguments with this method 
    			 *where there is option only for 2, 4, 5 and 8 arguments.
    			 */
    		}
    	});
 
    	openFileItem=new JMenuItem();
    	openFileItem.setText("Open");
    	openFileItem.setToolTipText("Click to open existing file");
    	openFileItem.setActionCommand("open");
    	openFileItem.addActionListener(new ActionListener(){
    		public void actionPerformed(ActionEvent ae){
    			//action here
    		}
    	});
 
    	exitItem=new JMenuItem();
    	exitItem.setText("Exit");
    	exitItem.setToolTipText("Click to Exit");
    	exitItem.setActionCommand("exit");
    	exitItem.addActionListener(new ActionListener(){
    		public void actionPerformed(ActionEvent ae){
    			//action here
    		}
    	});
 
    	fileMenu=new JMenu("File");//missing menu name it would be not visible even if added to JMenuBar
    	fileMenu.add(newFileItem);
    	fileMenu.add(openFileItem);
    	fileMenu.add(exitItem);
    	menuBar.add(fileMenu);//never added to JMenuBar
    	frame.setJMenuBar(menuBar);//JMenuBar never added to frame
 
    	frame.addWindowListener(new WindowAdapter(){
    		public void windowClosing(WindowEvent we){
    		int result = JOptionPane.showConfirmDialog( frame, "Do you really Want to exit?", "Confirmation", JOptionPane.YES_NO_OPTION );
               if( result == JOptionPane.YES_OPTION )
               {
                  System.exit( 0 );
               }
    	}
    	});
    	frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
    	frame.setSize(400,400);
    	frame.setTitle("A Frame");
    	frame.setVisible(true);
    }
 
    public static void main(String[] args)
    {
    	SwingUtilities.invokeLater(new Runnable(){
    		public void run(){
    			new FrameExample();
    		}
    	});
    }
}

openFileItem.addActionListener(new ActionListener(){
    		public void actionPerformed(ActionEvent ae){
    			//action here
    		}
    	});