NumberConstants class encapsulate a collection of Number formatting
symbols for use with Number format and parse services. This class extends
GWT's Constants class. The actual symbol collections are defined in a set
of property files named like "NumberConstants_xx.properties". GWT will
will perform late binding to the property file that specific to user's
If you previously were using GWT.create on this interface, you should
use LocaleInfo.getCurrentLocale().getNumberConstants() instead.