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The first method returns a ResourceBundle for the default locale, and the
second method returns a ResourceBundle for the specified locale. baseName is
the base name for a set of classes, each of which describes the information
for a given locale. These classes are named in Table 35.3.
Table 35.3:
Resource Bundle Naming Conventions
1. BaseName_language_country_variant.class
2. BaseName_language_country.class
3. BaseName_language.class
4. BaseName.class
5. BaseName_language_country_variant.properties
6. BaseName_language_country.properties
7. BaseName_language.properties
8. BaseName.properties
For example, MyResource_en_BR.class stores resources specific to the United
Kingdom, MyResource_en_US.class stores resources specific to the United
States, and MyResource_en.class stores resources specific to all the Englishspeaking
countries.
The getBundle method attempts to load the class that matches the specified
locale by language, country, and variant by searching the file names in the
order shown in Table 35.3. The files searched in this order form a resource
chain. If no file is found in the resource chain, the getBundle method raises
a MissingResourceException, a subclass of RuntimeException.
Once a resource bundle object is created, you can use the getObject method to
retrieve the value according to the key. For example,
ResourceBundle res = ResourceBundle.getBundle("MyResource");
String flagFile = (String)res.getObject("nationalFlag");
String anthemFile = (String)res.getObject("nationalAnthem");
Color color = (Color)res.getObject("nationalColor");
double growthRate = (Double)res.getObject("annualGrowthRate");
TIP
If the resource value is a string, the convenient getString
method can be used to replace the getObject method. The
getString method simply casts the value returned by getObject
to a string.
What happens if a resource object you are looking for is not defined in the
resource bundle? Java employs an intelligent look-up scheme that searches the
object in the parent file along the resource chain. This search is repeated
until the object is found or all the parent files in the resource chain have
been searched. A MissingResourceException is raised if the search is
unsuccessful.
Let us modify the NumberFormatDemo program in the preceding example so that it
displays messages, title, and button labels in multiple languages, as shown in
Figure 35.10.
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