Can someone explain this code to me? Counting occurrence of a number. Works fine but need explanation

Question

Scanner input = new Scanner(System.in);
int[] number = new int[100];
System.out.print("Enter the integers between 1 and 100: ");
for (int i = 0; i < number.length; i++) {
int a = input.nextInt();
number[a] += a;
if (a == 0) break; }
for (int i = 1; i < number.length; i++) {
if (number[i] != 0) { if (number[i] / i > 1) System.out.println(i + " occurs " + number[i] / i + " times");
else
System.out.println(i + " occurs " + number[i] / i + " time"); } } } }

Answer 1

number[i] gets incremented by i every time we see the actual number i in the input.

So in the end, in order to count the actual number of occurrences for i, we need number[i]/i .

I would optimize it by simply incrementing by 1 every time we see the number, and printing number[i] directly :)