Return a set of values from a map

Question

I have a map HashMap <Integer,Employee> map= new HashMap<Integer,Employee>(); The class Employee has an int attribute int empid; which will serve as key to the map.

My method is

public Set<Employee> listAllEmployees()
{
      return map.values();                //This returns a collection,I need a set
}

How to get set of employees from this method?

Answer 1

Just create a new HashSet with map.values()

public Set<Employee> listAllEmployees()
{
      return  new HashSet<Employee>(map.values());                
}

Answer 2

In Java 8 by Stream API you can use this method

public Set<Employee> listAllEmployees(Map<Integer,Employee> map){
    return map.entrySet().stream()
        .flatMap(e -> e.getValue().stream())
        .collect(Collectors.toSet());
}

Upd.: This code performs the task but is some kind of overcoding. Just KISS and do it as in answer here https://stackoverflow.com/a/19075053/4609353