java - How to get multiple averages from ArrayList? -

code below generates 100 sorted random doubles 0 100, it's calculating average (avg) 100 numbers. intention calculate 10 averages numbers , sort them, in many tries or 100 sorted-random numbers or 1 average :(

how 10 sorted averages?

public class newmain {     private static random rand = new random();      public static void main(string[] args) {         system.out.println(arrays.tostring(sortowacz(100, 0, 100)));     }      public static object[] sortowacz(final double length, final double min,                                      final double max) {         list<double> nieposortowanalista = randlist(length, min, max);          collections.sort(nieposortowanalista);         return nieposortowanalista.toarray();     }      private static list<double> randlist(final double length, final double min,                                          final double max) {         list<double> list = new arraylist<>();         list<double> avg = new arraylist<>();         double sum = 0.0;          (int = 0; < length; i++) {             list.add(min + (max - min) * rand.nextdouble());         }          (int = 0; < list.size(); i++) {             sum += list.get(i);         }          avg.add(sum / list.size());          return list;     } } 

this required code calculate 10 averages out of 100 , sort them @ end

public class testaverages {  public static void main(string... args) {      list<double> averages = sortowacz(1000, 0, 100);     averages.foreach(system.out::println); }  public static list<double> sortowacz(final double length, final double min, final double max) {     list<double> list = new arraylist<>();     random rand = new random();     (int = 0; < length; i++) {          list.add(min + (max - min) * rand.nextdouble());     }      list<double> averages = new arraylist<>();     while (!list.isempty()) {         list<double> sublist = list.sublist(0, (int) (length/10));         double avg = sublist.parallelstream().maptodouble(d -> d).average().getasdouble();         averages.add(avg);         list.removeall(sublist);     }     return averages;  } }