Java 8 - Best way to transform a list: map or foreach?

Question

I have a list myListToParse where I want to filter the elements and apply a method on each element, and add the result in another list myFinalList.

Answer 1

I prefer the second way.

When you use the first way, if you decide to use a parallel stream to improve performance, you'll have no control over the order in which the elements will be added to the output list by forEach.

When you use toList, the Streams API will preserve the order even if you use a parallel stream.