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 look like.

Set<String> results = new HashSet<String>();  someDao.findByType(type)             .stream()             .forEach(t-> result.add(t.getSomeMethodValue()) ); 

Could it look something like this? If so how do I make it do it?

Set<String> results = someDao.findByType(type)             .stream()             .collect(  /*  ?? no sure what to put here  */ ); 

Answer 1

Use Collectors.toSet :

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