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1、1Chapter36Internationalization2ObjectivesTodescribeJava'sinternationalizationfeatures(§36.1).Toconstructalocalewithlanguage,country,andvariant(§36.2).Todisplaydateandtimebasedonlocale(§36.3).Todisplaynumbers,currencies,andpercentagesbasedonlocale(§36.4).Todevelopappl
2、icationsforinternationalaudiencesusingresourcebundles(§36.5).TospecifyencodingschemesfortextI/O(§36.6).3Java’sInternationalSupport1.UseUnicode2.ProvidetheLocaleclasstoencapsulateinformationaboutaspecificlocale.ALocaleobjectdetermineshowlocale-sensitiveinformation,suc
3、hasdate,time,andnumber,isdisplayed,andhowlocale-sensitiveoperations,suchassortingstrings,areperformed.3.UsetheResourceBundleclasstoseparatelocale-specificinformationsuchasstatusmessagesandtheGUIcomponentlabelsfromtheprogram.Theinformationisstoredoutsidethesourcecodea
4、ndcanbeaccessedandloadeddynamicallyatruntimefromaResourceBundle,ratherthanhard-codedintotheprogram.4TheLocaleClassALocaleobjectrepresentsaspecificgeographical,political,orculturalregion.AnoperationthatrequiresaLocaletoperformitstaskiscalledlocale-sensitive.YoucanuseL
5、ocaletotailorinformationtotheuser.5CreatingaLocaleTocreateaLocaleobject,youcanusethe followingconstructorinLocaleclass:Locale(Stringlanguage,Stringcountry)Locale(Stringlanguage,Stringcountry,Stringvariant)Example:newLocale(“en”,“US”);newLocale(“fr”,“CA”);Locale.CANAD
6、ALocale.CANADA_FRENCH6TheLocale-SensitiveOperationsAnoperationthatrequiresaLocaletoperformitstaskiscalledlocale-sensitive.Displayinganumberasadateortime,forexample,isalocale-sensitiveoperation;thenumbershouldbeformattedaccordingtothecustomsandconventionsoftheuser'slo
7、cale.SeveralclassesintheJavaclasslibrariescontainlocale-sensitivemethods.Date,Calendar,DateFormat,andNumberFormat,forexample,arelocale-sensitive.Allthelocale-sensitiveclassescontainastaticmethod,getAvailableLocales(),whichreturnsanarrayofthelocalestheysupport.Forexam
8、ple,Locale[]availableLocales=Calendar.getAvailableLocales();returnsallthelocalesforwhichcalendarsareinstalled.7ProcessingDateandTim
