How can I read the amount of input a user has entered into an array with a set size?

The objective is to make an array of size 100, have a user enter a bunch of positive numbers, and quit whenever they enter -1 (or fill up 100 spots I guess). After that, print out the number of inputs read in, the average value, and highest value. I was testing my code with a smaller sized array originally to get the average and now realize that array.length isn't what I'm looking for as I switch it to 100 and don't fill up 100 slots. My question is, how can I count the amount of input thats been entered into an array and not just the total length of an array?

import java.util.*;
class Array{
    public static void main(String [] args){
       Scanner scan = new Scanner(System.in);
       int[] array = new int[100];

       System.out.println("Enter your number: ");
       for(int i = 0; i < 100; i++){
          int entry = scan.nextInt();
          if(entry == -1){
             System.out.println("Goodbye.");
             i--;
             break;
          }else if(entry < -1){
             System.out.println("Invalid.");
             i--;
          }else{
             array[i] = entry;
          }
       } 
       //prints amount of elements inside array
       //System.out.println("There are " + countArray(array) + " numbers in this array.");

       //prints average
       System.out.println("The average is: " + findAverage(array));   

       //prints highest val
       System.out.println("The highest value is: " + findHigh(array));
 
    }
    //public static int countArray(int[] array)
    //need help here and then fixing the issue in the average method

     public static double findAverage(int [] array){
         double sum = 0;
         for(int i = 0; i < array.length; i++){
            sum += array[i];
         }
         double average = (sum/array.length);
         return average;
      }

      public static int findHigh(int[]array){
         int max = array[0];
         for(int i = 1; i < array.length; i++){
            if (array[i] > max){
               max = array[i];
            }
         } 
         return max;
      }  
}