src/share/classes/java/util/function/DoubleUnaryOperator.java

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@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -28,10 +28,11 @@
  * An operation on a single {@code double} operand yielding a {@code double}
  * result.
  *
  * @since 1.8
  */
+@FunctionalInterface
 public interface DoubleUnaryOperator {
 
     /**
      * Returns the {@code double} result of the operation upon the
      * {@code double} operand.