Java Utililty Methods BufferedImage Flip

int w = img.getWidth();
int h = img.getHeight();
BufferedImage flippedImage = new BufferedImage(w, h, img.getColorModel().getTransparency());
Graphics2D g = flippedImage.createGraphics();
g.drawImage(img, 0, 0, w, h, 0, h, w, 0, null);
g.dispose();
return flippedImage;

if (null == img)
    return null;
int w = img.getWidth();
int h = img.getHeight();
BufferedImage flipImg = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = flipImg.createGraphics();
java.awt.Composite prevComposite = g2d.getComposite();
g2d.setComposite(java.awt.AlphaComposite.Src);
...