Reading Image From Folder And Draw It On Jlabel

I'm trying to read images and draw them on JLabel. This code snippet below is reading images from a folder

private ArrayList<ShowItem> getData() {
int score = 0;
ArrayList<ShowItem> item = new ArrayList<ShowItem>();
File dir = new File(getImageFolderPath());
if (dir.isDirectory()) {
for (final File f : dir.listFiles(IMAGE_FILTER)) {
BufferedImage img = null;
try {

[Code]...

ShowItem is a class that extends Image. DisplayImage extends ShowItem.

One of the overridden methods in ShowItem is

@Override
public Graphics getGraphics() {
return null;
}

I'm not exactly sure what to do here so I left it.

In another class, where I draw the images on Jlabel. This is what I have:

ShowItem theImage;
private ArrayList<ShowItem> listofImages;
theImage = listofImages.get(random.nextInt(listofImages.size()));
ImageIcon icon = new ImageIcon(theImage);
label.setIcon(icon);

I tried to run it, and check if I'm actually getting the images, and did system out and it listed all the jpg images I have but it's not displaying on the panel.