stream list into a set

Question

I am looking to refactor how I have used a stream in some of my code. The first example is how I currently have done it. The second example is what im trying to make it lo

Answer 1

Use Collectors.toSet :

Set results = someDao.findByType(type)
        .stream()
        .map(ClassName::getValue)
        .collect(Collectors.toSet());