src/share/classes/java/util/Vector.java

@@ -1170,11 +1170,12 @@
                 }
                 while (i != size && modCount == expectedModCount) {
                     action.accept((E) elementData[i++]);
                 }
                 // update once at end of iteration to reduce heap write traffic
-                lastRet = cursor = i;
+                cursor = i;
+                lastRet = i - 1;
                 checkForComodification();
             }
         }
 
         final void checkForComodification() {