java in using brausing

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


public class SelectFile extends JFrame implements ActionListener {

   JLabel label;
   JMenuItem openItem;
   JMenuItem exitItem;
  public SelectFile() {
    setTitle("Image Viewer");
    setSize(300, 400);

    JMenuBar mbar = new JMenuBar();
    JMenu m = new JMenu("File");
    openItem = new JMenuItem("Open");
    openItem.addActionListener(this);
    m.add(openItem);
    exitItem = new JMenuItem("Exit");
    exitItem.addActionListener(this);
    m.add(exitItem);
    mbar.add(m);
    setJMenuBar(mbar);

    label = new JLabel();
    Container contentPane = getContentPane();
    contentPane.add(label, "Center");
  }

  public void actionPerformed(ActionEvent evt) {
    Object source = evt.getSource();
    if (source == openItem) {
      JFileChooser chooser = new JFileChooser();
      chooser.setCurrentDirectory(new File("."));

      chooser.setFileFilter(new javax.swing.filechooser.FileFilter() {
        public boolean accept(File f) {
            String name= f.getName().toLowerCase();
            return(name.endsWith(".jpg") || name.endsWith(".png")|| name.endsWith(".gif"));
        }

        public String getDescription() {
          return "GIF Images";
        }
      });

      int r = chooser.showOpenDialog(this);
      if (r == JFileChooser.APPROVE_OPTION) {
        String name = chooser.getSelectedFile().getPath();
        label.setIcon(new ImageIcon(name));
        }
    } else if (source == exitItem)
      System.exit(0);
  }

  public static void main(String[] args) {
    JFrame frame = new SelectFile();
    frame.show();
  }

}