Sorting a list with stream.sorted() in Java

I'm interested in sorting a list from a stream. This is the code I'm using:
    .sorted((o1, o2)->o1.getItem().getValue().compareTo(o2.getItem().getValue()))

Am I missing something? The list is not sorted afterward.

It should sort the lists according to the item with the lowest value.

for (int i = 0; i < list.size(); i++)
   System.out.println("list " + (i+1));
   print(list, i);

And the print method:

public static void print(List<List> list, int i)


  • This is not like Collections.sort() where the parameter reference gets sorted. In this case you just get a sorted stream that you need to collect and assign to another variable eventually:

    List result =, o2)->o1.getItem().getValue().

    You've just missed to assign the result