What is the default Set/List implementation with Collectors in Java 8 Stream API?

Question

I have below code snap with Java 8.

 List employees = DataProvider.getEmployees();
 Set set = employees.stream().filter(         


        

Answer 1

The toSet() collector does not specify which implementation it uses; you get a Set, that's all.

If you want a specific kind of set, use toCollection() and provide a factory method for your set:

    ...collect(Collectors.toCollection(HashSet::new));