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8.1 A Word About Locales
A locale represents a geographic, political, or
cultural region. In Java, locales are represented by the
java.util.Locale class. A locale is frequently
defined by a language, which is represented by its standard lowercase
two-letter code, such as en (English) or fr (French). Sometimes,
however, language alone is not sufficient to uniquely specify a
locale, and a country is added to the specification. A country is
represented by an uppercase two-letter code. For example, the United
States English locale (en_US) is distinct from the British English
locale (en_GB), and the French spoken in Canada (fr_CA) is different
from the French spoken in France (fr_FR). Occasionally, the scope of
a locale is further narrowed with the addition of a system-dependent
variant string.The Locale class maintains a static default
locale, which can be set and queried with Locale.setDefault(
) and Locale.getDefault( ).
Locale-sensitive methods in Java typically come in two forms. One
uses the default locale, and the other uses a
Locale object that is explicitly specified as an
argument. A program can create and use any number of nondefault
Locale objects, although it is more common simply
to rely on the default locale, which is inherited from the underlying
default locale on the native platform. Locale-sensitive classes in
Java often provide a method to query the list of locales that they
support.Finally, note that AWT and Swing GUI components (see Chapter 11) have a locale property, so it is possible for
different components to use different locales. (Most components,
however, are not locale-sensitive; they behave the same in any
locale.)
