在java中如何调用打开方式在新窗口中显示一文件

在java中如何调用打开方式在新窗口中显示一文件，如显示一图片
可是不能实现啊！
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
public class ImageViewer extends JFrame
implements ActionListener
{ public ImageViewer()
{ setTitle("看图工具");
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)
{ return f.getName().toLowerCase()
.endsWith(".gif")
|| f.isDirectory();
}
public String getDescription()
{ return "GIF Images";
}
});
int r = chooser.showOpenDialog(this);
if(r == JFileChooser.APPROVE_OPTION)
{ String name
= chooser.getSelectedFile().getName();
label.setIcon(new ImageIcon(name));
}
}
else if (source == exitItem) System.exit(0);
}
public static void main(String[] args)
{ JFrame frame = new ImageViewer();
frame.show();
}
private JLabel label;
private JMenuItem openItem;
private JMenuItem exitItem;
}

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怎么没有恢复的呢
哪位大哥、大姐帮忙啊！

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