Load image with java applet

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Java

Here is the LoadImage class to load image from file

the applet window appears but the image doesnt loads, also what type of image are loadable jpegs, gifs or png's

What I have tried:

package DrawImage;

   import java.net.*;
   import java.awt.*;

   public class LoadImage extends java.applet.Applet
   {
       Image uc  ;
       URL base;
       MediaTracker mt;

       public void init()
       {
           mt = new MediaTracker(this);
           try{
                   base = getDocumentBase();
                   }catch(Exception e){}

           uc = getImage(base, "aerodynamics.gif");
           mt.addImage(uc,1);

           try{
           mt.waitForAll();
           }catch(InterruptedException e){}
   }

       public void paint(Graphics g)
   {
           g.drawImage(uc, 45  , 45, Color.yellow, this);
       }
  }