[add-to-immutable-list] add elements to immutable list

core-java-modules/core-java-collections-list-6/src/test/java/com/baeldung/addtoimmutablelist/AddElementsToImmutableListUnitTest.java

@@ -16,6 +16,7 @@ public class AddElementsToImmutableListUnitTest {
         return List.copyOf(tmpList);
     }
 
+    @SafeVarargs
     public static <T> List<T> appendElements(List<T> immutableList, T... elements) {
         List<T> tmpList = new ArrayList<>(immutableList);
         tmpList.addAll(Arrays.asList(elements));