Here’s the latest publication by Brian Goetz, Oracle’s project lead for JSR 335, a.k.a. Project Lambda. Here’s a nice example showing new collection features, such as “Streams” using method references:
List<String> strings = ... int sumOfLengths = strings.stream() .map(String::length) .reduce(0, Integer::plus);
Another nice example showing the use of lambda expressions:
int sum = shapes.stream() .filter(s -> s.getColor() == BLUE) .map(s -> s.getWeight()) .sum();
See more, here:
http://cr.openjdk.java.net/~briangoetz/lambda/sotc3.html