--- jsr166/src/main/java/util/ArrayList.java	2018/03/28 02:50:41	1.57
+++ jsr166/src/main/java/util/ArrayList.java	2018/05/05 18:29:53	1.58
@@ -1122,6 +1122,10 @@ public class ArrayList<E> extends Abstra
             return true;
         }
 
+        public void replaceAll(UnaryOperator<E> operator) {
+            root.replaceAllRange(operator, offset, offset + size);
+        }
+
         public boolean removeAll(Collection<?> c) {
             return batchRemove(c, false);
         }
@@ -1591,15 +1595,17 @@ public class ArrayList<E> extends Abstra
 
     @Override
     public void replaceAll(UnaryOperator<E> operator) {
+        replaceAllRange(operator, 0, size);
+    }
+
+    private void replaceAllRange(UnaryOperator<E> operator, int from, int to) {
         Objects.requireNonNull(operator);
         final int expectedModCount = modCount;
         final Object[] es = elementData;
-        final int size = this.size;
-        for (int i = 0; modCount == expectedModCount && i < size; i++)
+        for (int i = from; modCount == expectedModCount && i < to; i++)
             es[i] = operator.apply(elementAt(es, i));
         if (modCount != expectedModCount)
             throw new ConcurrentModificationException();
-        modCount++;
         // checkInvariants();
     }