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quickly by the addition of the new language property file entries. So what should you analyze to internationalize your application Many types of data vary with region or language, so your approach depends on the application being delivered. A nonexhaustive item list of this data includes the following:
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9: Internationalization and Localization
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CERTIFICATION OBJECTIVE 9.02
List Three Features of the Java Programming Language That Can Be Used to Create an Internationalizable/Localizable Application
Now let s take a look at Java s support for internationalization and localization. We ll look at specific API classes and objects that have been designed to help with I18N and L10N.
Java Support for Internationalization and Localization
An internationalized JEE application cannot assume that it is being executed from a single locale and often needs to service requests for many locales simultaneously. That is to say that a client request will arrive with an associated locale and consequently expect the response with the same locale. Because internationalization affects all tiers of a JEE application, it is an architecturally fundamental issue. Unfortunately, on many JEE projects, application internationalization is an afterthought and usually requires a great deal of refactoring to incorporate it later. As stated previously, internationalization and localization dependencies need to be identified during the project design phase. Let s review some of the internationalization and localization classes, tools, and features available to use in Java.
Using java.util.Properties for Localization
The java.util.Properties class represents a set of properties that can be persisted. The properties can be loaded from or saved to a stream. Both the key and its corresponding lookup value in the list of properties is a string. The properties object typically stores information about the characteristics of an application or its environment, and this can also include information pertaining to internationalization and localization. By creating a properties object and using the load() method, a program can read a localized properties file or any arbitrary input stream and then access the appropriate localized values using the same key:
Properties props = new Properties(); String myProps = "l10nfile"; props.load(new BufferedInputStream(new FileInputStream(myProps); String msgvalue = System.getProperty("msgkey");
List Three Features of the Java Programming Language
See ResourceBundle a little later in this chapter for more advanced uses of properties for localization.
Locale
As mentioned, a locale is a way of identifying and using the exact language and cultural settings for a particular session or user. In Java, a locale is identified by one, two, and occasionally three elements:
n Language
This is the basic identifier for a locale. It contains a valid International Standards Organization, ISO 639, two-letter language code. Examples are en for English and es for Spanish. (A complete list of two-letter language codes can be found at http://ftp.ics.uci.edu/pub/ietf/http/related/iso639.txt.) This is a country code. It contains a valid ISO 3166 twoletter country code. Examples are GB for United Kingdom, CO for Colombia, and US for United States. (A complete list can be found at http://www.chemie. fu-berlin.de/diverse/doc/ISO_3166.html or http://std.dkuug.dk/i18n/ISO_3166.)
n Regional variation
n Variant
This element is less frequently specified. It is used for creating locales with vendor- or browser-specific code. Examples are WIN for Windows, MAC for Macintosh, and POSIX for POSIX (Linux or UNIX). It is also used to allow for the possibility of more than one locale per country and language combination. Most European countries also now have the EURO variant for currency formatting.
Locales are defined with the language and country code separated by an underscore, like so: es_CO or en_US. The Locale class provides a number of constants that you can use to create locale objects for common locales. For example, Locale.US creates a locale object for the United States. Other locale names include, for example, de for German, de_CH for Swiss-style German, and de_CH_POSIX for Swiss-style German on a POSIX-compliant platform. The locale object controls formatting for numeric, data, currency, and percent display. It can affect many other areas, such as how case folding (uppercasing and lowercasing of letters) is handled. It can affect the way a list is sorted (called the collation sequence), or which day appears in the leftmost column on a calendar. Based on the locale, Java provides mechanisms for loading the user interface, messages, and specialized code from resource bundles (which are defined next). In short, locales provide a way of configuring classes to match the user requirements dynamically. Platforms other than Java have slight variations for locale objects, names, and structures. For example, Microsoft Windows uses a proprietary three-letter code to identify a locale.
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