While you can use either ``++forEach(list::add)++`` or ``++collect++`` with a ``++Stream++``, ``++collect++`` is by far the better choice because it's automatically thread-safe and parallellizable. 

== Noncompliant Code Example

----
List<String> bookNames = new ArrayList<>();
books.stream().filter(book -> book.getIsbn().startsWith("0"))
                .map(Book::getTitle)
                .forEach(bookNames::add);  // Noncompliant
----

== Compliant Solution

----
List<String> bookNames = books.stream().filter(book -> book.getIsbn().startsWith("0"))
                .map(Book::getTitle)
                .collect(Collectors.toList());
----