||This class represents the set of symbols (such as the decimal separator, the
grouping separator, and so on) needed by
EfficientDecimalFormat is like the
DecimalFormat class, as described below, except that it:
1.) will format into an Appendable, to improve efficiency
2.) emits NaN for not-a-number, rather than ? (as described below).
Format is an abstract base class for formatting
locale-sensitive information such as dates, messages, and numbers.
||Defines constants that are used as attribute keys in the
AttributedCharacterIterator returned from
Format.formatToCharacterIterator and as field identifiers