Java 8, Lambda: Sorting within grouped Lists and merging all groups to a list

Question

Based on the following answer: https://stackoverflow.com/a/30202075/8760211

How to sort each group by stud_id and then return a List with all Students as result of the g

Answer 1

You can add one line:

studlistGrouped.values().forEach(list -> list.sort(Comparator.comparing(Student::getId)));

Or you can write your own collector.

I know which one I would choose.