From 6ebffeb8f7df78e7b9467f65176c4570ffcf361d Mon Sep 17 00:00:00 2001
From: HEMANTH M <128402149+hemanth0525@users.noreply.github.com>
Date: Mon, 2 Sep 2024 20:43:32 +0530
Subject: [PATCH] Add findDuplicates

---
 .../apache/commons/collections4/ListUtils.java    | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/src/main/java/org/apache/commons/collections4/ListUtils.java b/src/main/java/org/apache/commons/collections4/ListUtils.java
index b3dd237060..ff19fc8876 100644
--- a/src/main/java/org/apache/commons/collections4/ListUtils.java
+++ b/src/main/java/org/apache/commons/collections4/ListUtils.java
@@ -24,7 +24,6 @@
 import java.util.Iterator;
 import java.util.List;
 import java.util.Objects;
-import java.util.Set;
 
 import org.apache.commons.collections4.bag.HashBag;
 import org.apache.commons.collections4.functors.DefaultEquator;
@@ -189,19 +188,7 @@ public static <E> List<E> fixedSizeList(final List<E> list) {
      * @since 4.5.0-M3
      */
     public static <E> List<E> findDuplicates(final List<E> list) {
-        Objects.requireNonNull(list, "The input list must not be null.");
-
-        Set<E> seen = new HashSet<>();
-        Set<E> duplicates = new HashSet<>();
-        List<E> result = new ArrayList<>();
-
-        for (E element : list) {
-            if (!seen.add(element) && duplicates.add(element)) {
-                result.add(element);
-            }
-        }
-
-        return result;
+        return CollectionUtils.duplicateList(list);
     }
 
     /**