Handling event of a particular menuitem

Question

hi,
I've created a form with a Jmenu,but i m unable to listen the event of a particular menuitem. I'm sending my code in which when i click on any of the menu item it is listening to all the remaining menuitems also. so what changes are required in my below code in order to listen to a particular menu item?
And ya my second question regarding this code is i want my frame to be opened in maximized form so that it cannod be moved. My frame seems to b opened as maximized but its actually not bcoz its still movable,so is there any way to open it maximized?
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class menu implements ActionListener
JMenu m;
JMenuItem n,s,sa;
JMenuBar mb;
JFrame f = new JFrame();
menu() //constructor
f.getContentPane().setBackground(new Color(146,187,237));
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
f.setSize(screenSize.width,screenSize.height);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mb = new JMenuBar();
m = new JMenu("File");
mb.add(m);
n= new JMenuItem("New");
n.addActionListener(this);
m.add(n);
s= new JMenuItem("Save");
s.addActionListener(this);
m.add(s);
sa = new JMenuItem("Save As");
sa.addActionListener(this);
m.add(sa);
f.setJMenuBar(mb);
f.setVisible(true);
public void actionPerformed(ActionEvent e)
if(e.getSource()==n);
try
System.out.println("new");
catch(Exception e1)
e1.getMessage();
if(e.getSource()==s);
try
System.out.println("Save");
catch(Exception e1)
e1.getMessage();
if(e.getSource()==sa);
try
System.out.println("Save As");
catch(Exception e1)
e1.getMessage();
public static void main(String args[])
menu a = new menu();
}

Answer 1

How to use Menus
http://java.sun.com/docs/books/tutorial/uiswing/components/menu.html
just scroll down at the bottom of the page for examples.
If you want to maximize a frame use setExtendedState(JFrame.MAXIMIZED_BOTH)