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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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