Provides important utility classes, such as utility for array, file, image, etc.

Utility class is a class that consists a collection of static methods. A static method can be called directly without the need of creating the instance of the class. Thus all methods in this package can be used directly.

For example to use image utility (ImageUtil class) :

       BufferedImage src;

       // rotate the src image 90°, clockwise
       // directly call ImageUtil rotate method
       BufferedImage rotatedImage = ImageUtil.rotate(src, 90);