Solution: Find Duplicates in Array

class Duplicates {
 public static ArrayList < Integer > findDuplicates(int arr[]) {
  int arrSize = arr.length;
  ArrayList < Integer > duplicates = new ArrayList < Integer > ();
  for (int i = 0; i < arrSize; i++) {
   for (int j = i + 1; j < arrSize; j++) {
    if (arr[i] == arr[j] && i != j)
     duplicates.add(arr[i]);
   }
  }
  return duplicates;
 }
 public static void main(String[] args) {
  int arr[] = {
   7,
   5,
   4,
   3,
   5,
   11,
   7,
   11,
   3,
   11
  };
  ArrayList < Integer > dupes = findDuplicates(arr);
  System.out.println("Duplicates in " + Arrays.toString(arr) + " are " + dupes);
  int arr1[] = {
   6,
   5,
   17,
   17
  };
  dupes = findDuplicates(arr1);
  System.out.println("Duplicates in " + Arrays.toString(arr1) + " are " + dupes);
 }
}