图片换成jpeg个是的怎么就显示不出来了

import java.awt.*;
import java.awt.event.*;
import  java.awt.Component;
/**
 * @(#)DrawImage.java
 *
 * DrawImage application
 *
 * @author 
 * @version 1.00 2007/4/7
 */
 
public class DrawImage {
    
    public static void main(String[] args) {       System.out.println("Starting ...");
       Frame  f = new  Frame("DrawImage");
       f.addWindowListener(new WindowAdapter()
       {
        public void windowClosing(WindowEvent e)
        {
        System.exit(0);
        }
       });
      
       Image img = f.getToolkit().getImage("..\\logo.gif");//此处换成jpeg格式的怎么就不能显示了?????????????
       f.setSize(300,300); 
       f.setVisible(true);
       Graphics g = f.getGraphics();
       while(!g.drawImage(img,0,0,f))
       {
       };
             
    }
}