java - How to get List<Y> from Map<X,Y> by providing List<X> using google collection? -


i have map<x, y> , list<x>, extract values map<x, y> providing list<x>, result in list<y>. 1 way 

list<x> keys = getkeys();   map<x, y> map = getmap();   list<y> values = lists.newarraylistwithcapacity(keys.size());   for(x x : keys){      values.add(map.get(x));   }

now again need remove nulls in values (list<y>) using predicate or something. better way this?
there reason why method isn't there in google collections library?

something this:

list<y> values = lists.newarraylist(     iterables.filter(         lists.transform(getkeys(), functions.formap(getmap(), null),          predicates.notnull()));

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