On functional interfaces http://java.dzone.com/articles/introduction-functional-1 http://baddotrobot.com/blog/2014/04/07/functional-interfaces-in-java8/ Q: Give an example of an interface (or write a sane interface) that is not functional. Q: Which well known interface from Java 7 is a good candidate to be a functional interface? There are so many, pick one, it's enough.

On lambda expressions: Lambda expressions quick-start: http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/Lambda-QuickStart/index.html http://viralpatel.net/blogs/lambda-expressions-java-tutorial/

Stream API: http://java.amitph.com/2014/01/understanding-java-8-streams-api.html http://java.amitph.com/2014/02/java-8-streams-api-intermediate.html#.VVJEQlSUe00 http://java.amitph.com/2014/02/java-8-streams-api-terminal-operations.html#.VVJFU1SUe00