This is the examples used in the talk we made with Stuart Marks (@StuartMarks) at Devoxx Belgium 2018.
The talk is available on YouTube: https://youtu.be/ePXnCezwRuw and the slides are on Slideshare: https://www.slideshare.net/jpaumard/lambda-and-stream-master-class-part-1
You can can see the code exercises without the solutions on this commit: https://github.com/JosePaumard/lambda-master-class-part1/releases/tag/Examples_without_solutions