--- old/src/java.base/share/classes/java/util/ArrayList.java	2017-12-05 17:22:32.000000000 -0800
+++ new/src/java.base/share/classes/java/util/ArrayList.java	2017-12-05 17:22:32.000000000 -0800
@@ -26,6 +26,7 @@
 package java.util;
 
 import java.util.function.Consumer;
+import java.util.function.IntFunction;
 import java.util.function.Predicate;
 import java.util.function.UnaryOperator;
 import jdk.internal.misc.SharedSecrets;
@@ -417,6 +418,13 @@
         return a;
     }
 
+    // no spec changes relative to supertype
+    public <T> T[] toArray(IntFunction<T[]> generator) {
+        T[] a = generator.apply(size);
+        System.arraycopy(elementData, 0, a, 0, size);
+        return a;
+    }
+
     // Positional Access Operations
 
     @SuppressWarnings("unchecked")