Collect lines using the Multimap Collector

Question

Is there any way to hide below using collectors?

List<String[]> lines = getLines(); Multimap<String,String> multimap = ArrayListMultimap.create(); lines.forEach(line -> multimap.put(line[0],line[1]); ); 

Answer 1

You can use Multimaps.toMultimap collector:

 ListMultimap<String, String> multimap = lines.stream() .collect(Multimaps.toMultimap( l -> l[0], l -> l[1], ArrayListMultimap::create )); 

Or, if you do not need volatility, use the ImmutableListMultimap.toImmutableListMultimap collector:

 ListMultimap<String, String> multimap = lines.stream() .collect(toImmutableListMultimap(l -> l[0], l -> l[1]));