Add notes on what Java does.

pep-0378.txt

@@ -141,6 +141,16 @@ specifiers like::
 
 .. _`COBOL`: http://en.wikipedia.org/wiki/Cobol#Syntactic_features
 
+Java offers a `Decimal.Format Class`_ that uses picture patterns (one
+for positive numbers and an optional one for negatives) such as:
+``"#,##0.00;(#,##0.00)"``. It allows arbitrary groupings including
+hundreds and ten-thousands and uneven groupings.  The special patten
+characters are non-localized (using a DOT for a decimal separator and
+a COMMA for a grouping separator).  The user can supply an alternate
+set of symbols using the formatter's *DecimalFormatSymbols* object.
+
+.. _`Decimal.Format Class`: http://java.sun.com/javase/6/docs/api/java/text/DecimalFormat.html
+
 
 Alternative Proposal (from Eric Smith, originally called Proposal II)
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