Boaty

    private static void sort(int[] arr)    {        int zero = 0, back = arr.length - 1;                for (int i : arr)        {            if (i == 0)                zero++;        }                for (int i = 0; i < arr.length; i++)        {            if (arr[i] == 1 && i < zero)            {                arr[i] = arr[back];                arr[back] = 1;                back--;                i--;            }        }    }