I am using friedman test in my application and I need a post-hoc comparison. I selected tukey test but I did not find the related class in JSC. Is there any other classes to implement it?
I suggest you use JRI, http://rforge.net/JRI/. This allows you to run R inside Java applications. Everything which you can imagine from statistics has been implemented in R. You don't have to write everything anew, yourself.