Using write method to save a picture file in Java

I need to save a picture object into the working directory with a specific file name using the write method. Here's my code:

public void storePhotos(String directory){

for(int i = 0; i < labelledPhotos.length; i++){
  Picture currentPhoto = new Picture(labelledPhotos[i].getLabelledPhoto());

  String fileName = directory + "/" + labelledPhotos[i].getYear() + "_" + labelledPhotos[i].getCategory() + "_" +  labelledPhotos[i].getId() + ".jpg";    
  currentPhoto.write(fileName);

}

The user is suppose to input the director as the parameter and I need to save the image to the directory. For some reason the write method isn't saving it. If I hard code in the directory into the write parameter like:

currentPhoto.write("pic.jpg");

then the photo gets saved into directory. So I know its something wrong with the String fileName and how it gets passed into the write method, but I'm not sure what. Any help would be greatly appreciated.