AOC 2021 Day 6 Part 2 Java

import java.util.stream.Stream;

class AOC2021_6 {

    private static long fishCount = 0;

    public static void main(String[] args) {

        long start = System.currentTimeMillis();

        String sample = "3,4,3,1,2";
        String input = "2,1,2,1,5,1,5,1,2,2,1,1,5,1,4,4,4,3,1,2,2,3,4,1,1,5,1,1,4,2,5,5,5,1,1,4,5,4,1,1,4,2,1,4,1,2,2,5,1,1,5,1,1,3,4,4,1,2,3,1,5,5,4,1,4,1,2,1,5,1,1,1,3,4,1,1,5,1,5,1,1,5,1,1,4,3,2,4,1,4,1,5,3,3,1,5,1,3,1,1,4,1,4,5,2,3,1,1,1,1,3,1,2,1,5,1,1,5,1,1,1,1,4,1,4,3,1,5,1,1,5,4,4,2,1,4,5,1,1,3,3,1,1,4,2,5,5,2,4,1,4,5,4,5,3,1,4,1,5,2,4,5,3,1,3,2,4,5,4,4,1,5,1,5,1,2,2,1,4,1,1,4,2,2,2,4,1,1,5,3,1,1,5,4,4,1,5,1,3,1,3,2,2,1,1,4,1,4,1,2,2,1,1,3,5,1,2,1,3,1,4,5,1,3,4,1,1,1,1,4,3,3,4,5,1,1,1,1,1,2,4,5,3,4,2,1,1,1,3,3,1,4,1,1,4,2,1,5,1,1,2,3,4,2,5,1,1,1,5,1,1,4,1,2,4,1,1,2,4,3,4,2,3,1,1,2,1,5,4,2,3,5,1,2,3,1,2,2,1,4";

        String dataFish = input;

        int TTL = 256;

        Integer[] fish = Stream.of(dataFish.split(",")).map(Integer::valueOf).toArray(Integer[]::new);

        long[] data_ar = new long[8];

        for (int data=1; data<=7; data++) {
            fishCount = 1;
            reproduce(data, TTL);
            data_ar[data] = fishCount;
            System.out.println(data + " day-to-repro after " + TTL + " iterations leads to " + data_ar[data] + " fish.");
        }

        System.out.println("Counting fish...");

        fishCount = 0;

        for (int i=0; i<fish.length; i++){
            fishCount += data_ar[fish[i]];
        }

        System.out.println("Total fishcount: " + fishCount);
        long finish = System.currentTimeMillis();
        System.out.println("Time in msec: " + (finish - start));
        System.out.println("Time in sec: " + (finish - start) / 1000);
    }

    static void reproduce(int daysToReproduce, int rTTL) {
        for (int j = rTTL; j >= 0; j--) {
            if (daysToReproduce == -1) {
                daysToReproduce = 6;
                fishCount++;
                reproduce(8, j);
            }
            daysToReproduce--;
        }
    }
}