Frequency of each string in a list java programming

 public class countstringfromlist {

public static void main(String[] args) {

List<String> s1=Arrays.asList("aju","nima","vima","aju");

Map<String,Long> ngg=s1.stream().

collect(Collectors.groupingBy(s->s,Collectors.counting()));

ngg.forEach((k,v)->System.out.println(k+" "+v));

}

}