I'm absolutely talking about visual clarity. In the ruby code it is significantly more visually clear what is going on because the java code has a lot of incidental noise. If you would show a java version that would be clear to everyone, which is probably why you didn't add the sort. The code side-by-side will speak for itself.
Granted this uses guava, but there is nothing really more readable about your ruby code than this guy's java code. To say he 'lacks courage' ... jesus I'm still laughing. "Why didn't you add the sort!" You're too much man.