I can't figure out what's wrong with comparing array indexes

Question

I need to compare array indexes, not their meanings. I'm a newbie in java at all, and wrote this code and can't understand what exactly I'm doing wrong. Pls hlp.

public class Solution {
public static void main(String[] args) throws IOException {
    Scanner scanner = new Scanner(System.in);
    int[] numOfPeople = new int[15];
    for (int i = 0; i < numOfPeople.length; i++) {
        numOfPeople[i] = scanner.nextInt();
        
    int sum2 = 0;
    int sum1 = 0;
    
    if (i % 2 == 0) {
        sum2 = sum2 + numOfPeople[i];
    } else if (i % 2 != 0) {
        sum1 = sum1 + numOfPeople[i];
    }
    
    if (sum2 > sum1) {
        System.out.println("В домах с четными номерами проживает больше жителей.");
    } else if (sum2 < sum1) {
        System.out.println("В домах с нечетными номерами проживает больше жителей.");
    } else {
        System.out.println();
            }
        }
    }

}

Answer 1

Please see my comments. Make sure you close the scanner and assign the variables outside the loop. I am not sure when you want the evaluation to take place, but it seems like it should not happen on every loop. I think you only want the end result, no?

import java.util.Scanner;

public class Solution {

  public static void main(String[] args) {

    int[] numOfPeople = new int[15];

    //I think you want these to be available outside the loop and not modified every iteration of the loop
    int sum2 = 0;
    int sum1 = 0;

    Scanner scanner = new Scanner(System.in);
    for (int i = 0; i < numOfPeople.length; i++) {

      //I added this just to help you see the iteration
      System.out.println("You must enter the value for index i: " + i);
      numOfPeople[i] = scanner.nextInt();


      //I think you mean to know if the index is even or odd here 
      if (i % 2 == 0) {
        sum2 = sum2 + numOfPeople[i];
      } else if (i % 2 != 0) {
        sum1 = sum1 + numOfPeople[i];
      }
    } // I think you want to close the loop here, because you do not want this evaluated every time you go to a new index, but rather at the end?
    scanner.close();
    if (sum2 > sum1) {
      System.out.println("Even has more occupancy");
    } else if (sum2 < sum1) {
      System.out.println("Odd has more occupancy");
    } else {
      System.out.println();
    }

  }

}