Is there a way to coalesce repeated numbers in a list using streams in Java 8?

Question

e.g.#1 [1, 1, 1, 2, 22, 35, 35, 120, 320] ==>> [3, 2, 22, 70, 120, 320]

note how repeated consecutive 1\'s and 35\'s are coalesced to 3 and 70

Answer 1

Why bother using streams when you can do it with a simple for loop and an if-else block?

   List list = List.of(0, 0, 0, 0, 1, 1, 1, 0, 0, 0);
   List result = new ArrayList<>();
   Integer curr = list.get(0);
   Integer sum = 0;
   for(Integer i : list){
       if(i.equals(curr)){
           sum += i;
       }
       else{
           result.add(sum);
           sum = i;
           curr = i;
       }
   }
   result.add(sum);
   System.out.println(result);