How to get the formatName of an image?

Hi,
I'm trying to write a little class which gets as input an image file (gif, jpg or png) and outputs a resized version of it. My aim is to output allways an image having the same format like the input one. I saw that ImageIO.write accepts as parameter the String formatName.
The question is how can somebody get the formatName for the input-image?
Thanks,
IMIA

I'd like to have a method like this:
public static String resizeImg(String imgPath, Integer newWidth, Integer newHeight)
It gets as parameter the absolutePath to an image and the new width&height; it should resize the image and return me the absolute path to the resized image.
What I want is that in the case the imgPath points to a gif image the resized image should be a gif as well. If it's a jpg the resized img should be a jpg as well. The only one pb I have is to find out inside the resizeImg what format the imgPath image has, the rest would be clear.
Thanks for your help.

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How to get the formatName of an image?

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