Entity Component System example[java]?

I heard little talks about http://ift.tt/1wQHg31 which seems really interesting but I'm having lots of trouble understanding how to implementing it!

Could somebody maybe show me a code example written in Java explaining the pattern and it's usage? Relating it to game development would really be a plus for me!

Just a basic explanation and code example (written in Java) would be more then enough for me to understand how it works. I've seen a lot online but no code! But lol, I might have seen the code and just not reconsigned it at ECS!

Thanks a lot!