src/share/classes/java/util/Collections.java

@@ -3825,10 +3825,11 @@
      * @throws IllegalArgumentException if some property of a value in
      *         <tt>elements</tt> prevents it from being added to <tt>c</tt>
      * @see Collection#addAll(Collection)
      * @since 1.5
      */
+    @SafeVarargs
     public static <T> boolean addAll(Collection<? super T> c, T... elements) {
         boolean result = false;
         for (T element : elements)
             result |= c.add(element);
         return result;