input: 12,34
output:
0 (no values from 0-9)
1 (12 is between 10-19)
0
1 (34 between 30-39)
... (my values are guaranteed to be between 0-100)

package javaapplication2;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Map;
import java.util.concurrent.ThreadLocalRandom;
import java.util.stream.Collectors;

public class JavaApplication2 {

        public static void main(String[] args){
        //generating sample data------------------------------
            class Temp{
                Long vote=ThreadLocalRandom.current().nextLong(100);
                public long getVote(){
                    System.out.println(vote);
                    return vote;
                }
            }

            ArrayList<Temp> t = new ArrayList<>();
            t.add(new Temp());
            t.add(new Temp());
            t.add(new Temp());
            //end generating data------------------------------------
Map<Integer, Long> counters =
               t.stream()
                .collect(Collectors.groupingBy(p -> ((int)p.getVote())/10,
                         Collectors.counting()));

Collection<Long> values = counters.values();
Long[] res = values.toArray(new Long[values.size()]);
for(Long l:res)
    System.out.println(l.toString());
        }

}