Why don't primitive Stream have collect(Collector)?

Question

I\'m writing a library for novice programmers so I\'m trying to keep the API as clean as possible.

One of the things my Library needs to do is perform some complex c

Answer 1

We did in fact prototype some Collector.OfXxx specializations. What we found -- in addition to the obvious annoyance of more specialized types -- was that this was not really very useful without having a full complement of primitive-specialized collections (like Trove does, or GS-Collections, but which the JDK does not have). Without an IntArrayList, for example, a Collector.OfInt merely pushes the boxing somewhere else -- from the Collector to the container -- which no big win, and lots more API surface.