We would like to know how to get word Frequency with Lambda.
import java.util.Arrays; import java.util.List; import java.util.Map; import java.util.stream.Collectors; /*w w w. j a va2 s .c om*/ public class Main { public static void main(String[] args) { List<String> terms = Arrays.asList("this", "is","is","a"); Map<String, Integer> result = terms .parallelStream() .flatMap(s -> Arrays.asList(s.split(" ")).stream()) .collect( Collectors.toConcurrentMap(w -> w.toLowerCase(), w -> 1, Integer::sum)); System.out.println(result); } }