SortList<Employee> inside Map<String, List<Employee>> based on key-CodePudding

I have a List

class Employee{
        String name;
        Integer id;
}

and my list looks like this

[{name:"Satya", id:123},{name:"Andrew", id:125}, {name:"Satya",id:124"}]

now i want to group the above list on names, for which i have written something of this sort.

Map<String, List<Employee>> groupedData = data.stream()
                    .collect(groupingBy(Employee::getName,
                                    LinkedHashMap::new, Collectors.toList()))

So my result looks like this:

{"Satya":[{name:"Satya", id:124}, {name:"Satya", id:123}], "Andrew":[{name:"Andrew", id:125}]}

I want the list to be sorted, the end result should look something like this:

 {"Satya":[{name:"Satya", id:123}, {name:"Satya", id:124}], "Andrew":[{name:"Andrew", id:125}]}

As you can see all the records for every name are sorted based on ID.

CodePudding user response：

You can sort by name, that will also group them, though the actual format is different than what you show.

Collections.sort( data, Employee::getName );

CodePudding user response：

You could sort before collecting, i.e. add stream().sorted(...)

data.stream()
    .sorted(Comparator.comparingInt(Employee::getId))
    .collect(Collectors.groupingBy(Employee::getName, LinkedHashMap::new, Collectors.toList()));