On 14.12.2012 I took part of initiative called Java Advent Calendar with a post about Functional Java collections. The idea for the Calendar is very simple, one technical article will be published per day between the 1st and 24th of December. This initiative is done for other languages like Perl or PHP and even some frameworks like Perl Dancer. You can directly sign up on the RSS feed or follow via e-mail. How can you help? Sharing on the social networks is highly appreciated. You can also visit the original hello world post or read on Wikipedia about Advent Calendars.