ResourceBundle and Locale ?

Question

Hi All,
Anybody please tell me what is the use of ResourceBundle and Locale ?
Can I use it in my util/Servlet class ?
What is the advantage of using it ?
Please reply soon
Thanks
Harish Pathak

Answer 1

ResourceBundle is a utility class provided by the java.util package which internally uses ClassLoader and loads files which .properties extension.
Incase you wish to make your application Region or Language specific. Then you can use the Locale concept of ResourceBundle and have multiple property files for each region.
You can set the Locale for the ResourceBundle like en_US where region is US and language is en (english) and it will load the appropriate property file.
--- For your information
Gets a resource bundle using the specified base name, locale, and class loader.
Conceptually, getBundle uses the following strategy for locating and instantiating resource bundles:
getBundle uses the base name, the specified locale, and the default locale (obtained from Locale.getDefault) to generate a sequence of candidate bundle names. If the specified locale's language, country, and variant are all empty strings, then the base name is the only candidate bundle name. Otherwise, the following sequence is generated from the attribute values of the specified locale (language1, country1, and variant1) and of the default locale (language2, country2, and variant2):
baseName + "_" + language1 + "_" + country1 + "_" + variant1
baseName + "_" + language1 + "_" + country1
baseName + "_" + language1
baseName + "_" + language2 + "_" + country2 + "_" + variant2
baseName + "_" + language2 + "_" + country2
baseName + "_" + language2
baseName
Candidate bundle names where the final component is an empty string are omitted. For example, if country1 is an empty string, the second candidate bundle name is omitted.
getBundle then iterates over the candidate bundle names to find the first one for which it can instantiate an actual resource bundle. For each candidate bundle name, it attempts to create a resource bundle:
First, it attempts to load a class using the candidate bundle name. If such a class can be found and loaded using the specified class loader, is assignment compatible with ResourceBundle, is accessible from ResourceBundle, and can be instantiated, getBundle creates a new instance of this class and uses it as the result resource bundle.
Otherwise, getBundle attempts to locate a property resource file. It generates a path name from the candidate bundle name by replacing all "." characters with "/" and appending the string ".properties". It attempts to find a "resource" with this name using ClassLoader.getResource. (Note that a "resource" in the sense of getResource has nothing to do with the contents of a resource bundle, it is just a container of data, such as a file.) If it finds a "resource", it attempts to create a new PropertyResourceBundle instance from its contents. If successful, this instance becomes the result resource bundle.
If no result resource bundle has been found, a MissingResourceException is thrown.