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

*** 1,7 ****
  /*
!  * Copyright (c) 2010, 2012, 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
--- 1,7 ----
  /*
!  * Copyright (c) 2010, 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
*** 33,42 ****
--- 33,43 ----
   * @param <R> the type of result objects from the {@code apply} operation. May
   * be the same type as {@code <T>}.
   *
   * @since 1.8
   */
+ @FunctionalInterface
  public interface Function<T, R> {
  
      /**
       * Yield an appropriate result object for the input object.
       *