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src/java.base/share/classes/java/text/NumberFormat.java

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@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2017, 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

@@ -172,10 +172,17 @@
  * Number formats are generally not synchronized.
  * It is recommended to create separate format instances for each thread.
  * If multiple threads access a format concurrently, it must be synchronized
  * externally.
  *
+ * @implSpec The {@link #format(double, StringBuffer, FieldPosition)},
+ * {@link #format(long, StringBuffer, FieldPosition)} and
+ * {@link #parse(String, ParsePosition)} methods may throw
+ * {@code NullPointerException}, if any of their parameter is {@code null}.
+ * The subclass may provide its own implementation and specification about
+ * {@code NullPointerException}.
+ *
  * @see          DecimalFormat
  * @see          ChoiceFormat
  * @author       Mark Davis
  * @author       Helena Shih
  */
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