How to apply sorting and limiting after groupby using Java streams

Question

I have the following list of Employee data which I need to group based on the employee department and then I want to find the 2 highest-paid employees in each department.

Answer 1

This part of code:

e -> e.stream().sorted().limit(limit).collect(Collectors.toList())

return List of List and not List, so either you change the type of the result to:

Map> groupByTeachers = 
                // ...The rest of your code

Or if you expect Map>, change the collectingAndThen to get the expected field, for example getName or getDep:

e -> e.stream().sorted().limit(limit)
        .map(Employee::getDep) // for example getDep
        .collect(Collectors.toList())