This is just a test program..

What i want to do is that when the user clicks Exit in the menu bar, a string or a label will appear in panel 2...but it doesn't work...what is wrong with my code?
Code:
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JMenuBar;
import javax.swing.JLabel;

public class test2 extends JFrame{
	private static final int WIDTH=300;
	private static final int HEIGHT=200;

	private JPanel p1=new JPanel();
	private JPanel p2=new JPanel();

	public test2(){
		super();
		setSize(WIDTH,HEIGHT);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setLayout(new BorderLayout());

		JLabel l=new JLabel("Label 1");
		p1.add(l);

		JMenuItem exit=new JMenuItem("Exit");
		exit.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){
				//System.exit(0);
				JLabel l2=new JLabel("Exit clicked");
				p2.add(l2);
			}
		});
	
		add(p1, BorderLayout.NORTH);
		add(p2, BorderLayout.SOUTH);



		JMenuBar bar=new JMenuBar();
		bar.add(exit);
		setJMenuBar(bar);
	}

	public static void main(String[] args){
		test2 t=new test2();
		t.setVisible(true);
	}
}