How to convert images to gif/jpeg files

I have created images in java. Now i want to convert this image into a gif/jpeg file so that i can save this gif/jpeg file in one particular folder on the system & also show the same file to the user.

use
javax.imageio.ImageIO.write
for an introduction see:
http://java.sun.com/products/jfc/tsc/articles/javaOne2001/600/

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