Below and Above Average

public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        String line = scan.nextLine();
        String [] list = line.split(",");
        int[] all = new int[list.length];
        String bellow = "";
        String above = "";
        double sum = 0;


        for (int i = 0; i <list.length ; i++) {
           all[i] = Integer.parseInt(list[i]);
           sum+= Integer.parseInt(list[i]);
        }

        double average = sum / (double) all.length;

        for (int i = 0; i < all.length; i++) {
            if (average!=0.00) {
                if (all[i] <= 0) {
                    bellow += all[i] + ",";
                }
                if (all[i] > 0) {
                    above += all[i] + ",";
                }
            } else {
                if (all[i] < 0) {
                    bellow += all[i] + ",";
                }
                if (all[i] > 0) {
                    above += all[i] + ",";
                }
            }
        }

        System.out.printf("avg: %.2f%n",average);
        System.out.println("below: "+bellow.substring(0, bellow.length()-1));
        System.out.println("above: "+above.substring(0, above.length()-1));
    }
}