将项目收集到Guava Multimap

Question

I'm trying to collect item to a final Guava Multimap . I've noticed that Flowable has a .toMultimap but I can't figure out how to use it to return what I need.

Here is a snippet

Single<Map<String, Collection<String>>> map = getActiveUsers().toFlowable() //
        .flatMapIterable(users -> users) //
        .map(User::getFullName) //
        .distinct() //
        .toMultimap(FullName::first, FullName::second);

How can I change this code to return a Guava Multimap<String,String> instead of Map<String,Collection<String>>

Answer 1

Use collect :

source.collect(
    HashMultimap::create, 
    (mmap, item) -> mmap.put(item.first, item.second)
)