I had a great time at the Java User Group Cologne tonight, presenting the best and latest features of NetBeans IDE 8.1, followed by Michael Mueller, who talked about Java 8, lambdas, and streams, as described here.
Pretty big turnout, as can be seen below.
Here's me in action:
During Michael's talk, he introduced his book-in-progress "Java Lambdas und (parallel) Streams", currently only available in German, shown below. I was really impressed by the structured way in which he presented the problem statements around lambdas and streams and gradually built up his argument.
I enjoyed the evening, there were many questions and discussions, and Cologne is a great place to visit.