JAVA完数的判断

package com.iflytek.helloworld;

/**
* "Tools": "Created with IntelliJ IDEA",
* "Company": "Copyright © 1999 - 2023 iFLYTEK .CO.LTD.(HeFei) ALL Right Reserved.",
* "Author": "Coder.Mr.T",
* "Email": "xjd_aiit_1960_thj@163.com || 2908597938@qq.com",
* "GitHub": "<a href="https://github.com/Coder-Mr-T">...</a>",
* "Gitee": "<a href="https://gitee.com/AIITCherry">...</a>",
* "Date": "Do not edit", // 文件创建时间(不变)
* "LastEditors": "HashMap2020 && xjd_aiit_1960_thj@163.com", // 文件最后编辑者
* "LastEditTime": "Do not edit", // 文件最后编辑时间
* "FilePath": "Do not edit", // 文件在项目中的相对路径 自动更新
* "Description": "To Do..."
*/

import java.util.Scanner;

public class Main {
 public static void main(String[] args) {
   Scanner scanner = new Scanner(System.in);

   while (scanner.hasNext()) {
     int n = scanner.nextInt();
     for (int i = 1; i <= n; i++) {
       int[] arr = new int[i];
       int index = 0, sum = 0;
       for (int j = 1; j <= i / 2; j++) {
         if (i % j == 0) {
           arr[index++] = j;
           sum += j;
         }
       }
       if (sum == i) {
         System.out.printf("%d its factors are ", i);
         for (int k = 0; k < arr.length - 1; k++) {
           if (arr[k] != 0)
             System.out.print(arr[k] + " ");
         }
         System.out.println();
       }
     }
   }
 }
}