Programming exercises

So right now I have nothing I need to code for myself, or at least nothing I'd be ABLE to code for myself, but I still want to improve the quality of my code/get better/learn more.

Does anyone know of a website with programming exercises of beginner-intermediate level for Sepples and/or Java that would actually interest me?

I googled around a little and most of the exercises there were shitty university assignments.

>>8
I haven't touched client-server stuff, socks, etc

As for the thread, thanks for spoj.pl, but like the other guy said, projecteuler is more about maths than it is about programming. Nothing really worthwhile to learn there.