ne trouve symbole de l'action de l'auditeur

je suis en train de faire un explorateur de fichier de classe à l'aide de JFileChooser. je rencontre un problème lors de la compilation. il garder m'a dit que ne peut pas trouver le symbole actionlistener. ci-dessous mon code:

import java.util.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.text.*;
import javax.swing.filechooser.*;
public class BrowseForFile 
{
private JTextField txtFileName;
private JFrame layout;
public BrowseForFile()
{
super();
initialize();
}
public void initialize() 
{
//empty layout
layout = new JFrame();
layout.setTitle("Task Synchronization ");
layout.setBounds(100, 100, 800, 600);
layout.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
layout.getContentPane().setLayout(null);
//set the copyright
JLabel lblNewLabel_5 = new JLabel("(c) 2012 All Rights Reserved");
lblNewLabel_5.setForeground(Color.GRAY);
lblNewLabel_5.setFont(new Font("Tahoma", Font.PLAIN, 10));
lblNewLabel_5.setHorizontalAlignment(SwingConstants.RIGHT);
lblNewLabel_5.setBounds(527, 548, 255, 14);
layout.getContentPane().add(lblNewLabel_5);
//set the label
JLabel lblSendAFile = new JLabel("Select a file to be sent to all nodes");
lblSendAFile.setBounds(404, 400, 378, 14);
layout.getContentPane().add(lblSendAFile);
//set the textfield
txtFileName = new JTextField();
txtFileName.setBounds(404, 425, 277, 20);
layout.getContentPane().add(txtFileName);
txtFileName.setColumns(10);
//set the browse button and let it to choose file after click.
JButton btnBrowse = new JButton("Browse");
btnBrowse.setBounds(691, 424, 91, 23);
layout.getContentPane().add(btnBrowse);
btnBrowse.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File(dirName));
chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
FileNameExtensionFilter filter = new FileNameExtensionFilter(".txt only", "txt");
chooser.setFileFilter(filter);
try {
int code = chooser.showOpenDialog(null);
if (code == JFileChooser.APPROVE_OPTION) {
File selectedFile = chooser.getSelectedFile();
Scanner input = new Scanner(selectedFile); 
String f=selectedFile.getName();
txtFileName.setText("File Name is: "+f);
}
} catch (Exception f) {
f.printStackTrace();
}
}
});
}
public static void main(String[] args)
{
try 
{
BrowseForFile window = new BrowseForFile();
window.layout.setVisible(true);
} 
catch (Exception e) 
{
e.printStackTrace();
}
}
}

c'est l'erreur :

BrowseForFile.java:52: error: cannot find symbol
btnBrowse.addActionListener(new ActionListener()
^
symbol:   class ActionListener
location: class BrowseForFile
1 error

quelqu'un peut me dire quelle est l'erreur ? merci à l'avance.

OriginalL'auteur Eric | 2012-12-04