Abstract class problems

I have an abstract class, ImageCache. There are two abstract methods in it:      

public abstract class ImageCache<T> {

... ...

//constructor
public ImageCache(int capacity)
{
... ...
}

//abstract methods
      protected abstract ImageIcon createImage(T imgSrc);
      protected abstract void imageLoaded(T imgSrc);

}


I tried this but does not work:

public class LoadedCache<T> extends ImageCache {
ImageIcon imageIcon;
      
      public LoadedCache (int i)
      {
            super(i);
      }
... ...
      
      protected ImageIcon createImage(File imgSrc)
      {
            return (new  ImageIcon(imgSrc.getPath()));
      }
      
      
      protected  void imageLoaded(File imgSrc)
      {
            //some operations
      }
}

Error:
1.The type LoadedCache<E> must implement the inherited abstract method ImageCache.createImage(Object)
2.The type LoadedCache<E> must implement the inherited abstract method ImageCache.imageLoaded(Object)

I think it might be an easy question for gurus, but, it is really a question for me //blush