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Код

private void runThumbnailGenration() {
    Runnable thumbnailGenerator = new Runnable() {
      public void run() {
        int len = thumbnails.size();
        for (int i = 0; i < len; i++) {
          try {
            FileThumbnail thumbnail = thumbnails.get(i);
            if (accept(thumbnail.getFile())) {
              BufferedImage largeImage = ImageIO.read(thumbnail.getFile());
              double ratio = Math.min(MAX_WIDTH / largeImage.getWidth(),
                                      MAX_HEIGHT / largeImage.getHeight());

              AffineTransformOp affineTransformOp = new AffineTransformOp(
                  AffineTransform.getScaleInstance(ratio, ratio),
                  AffineTransformOp.TYPE_BICUBIC);

              BufferedImage thumbnailImage = affineTransformOp.
                                             createCompatibleDestImage(
                                                 largeImage, null);
              affineTransformOp.filter(largeImage, thumbnailImage);

              thumbnail.setIcon(thumbnailImage);
              fireContentsChanged(ThumbnailListModel.this, i, i);
              //Thread.sleep(50);
            }
          } catch (Exception e) {
            e.printStackTrace();
          } catch (Error err) {
            err.printStackTrace();
          }
        }
      }
    };

    thread = new Thread(thumbnailGenerator, "ThumbnailGenerator");
    thread.setPriority(Thread.MIN_PRIORITY);
    thread.setDaemon(true);
    thread.start();
  }