Boggled by this, Fast QuickSort Algorithm

Hello, there's a number of things I don't quite understand or need a bit of clarity on in this algorithm. This algorithm was taken from a website of examples of java sorts mostly written by James Gosling. This one however seemed to lack a number of braces the others didn't. the website is @ Sorting Algorithms Demo

EDITED: found classes used throughout at bottom of page, which includes methods pause() etc, which I originally thought must be system calls, and kept giving errors.