java与模式中有一个关于多例模式的一个多语言支持的一个例子，但程序有点问题，我把它修改了一下。
import java.util.HashMap;import java.util.Locale;import java.util.Map;import java.util.ResourceBundle;public class LingualResource { /** * This is the language attribute */ private String language = "en"; /** * This is the country attribute */ private String region = "US"; /** * This is the localeCode attribute */ private String localeCode = "en_US"; /** * This is the file name of the resource bundle */ private final static String FILE_NAME = "res"; /** * This collection keep many LingualResource object according to there locale code. */ private static Map<String,LingualResource> instances = new HashMap<String,LingualResource>(19); /** * This is the locale object, is initialized by language and region */ private Locale locale = null; /** * This is the ResourceBundle object, initialized by the locale and the * base file name. */ private ResourceBundle resourceBundle = null; /** * This is the default construct */ private LingualResource(){} /** * This is another overloaded constructor * @param language The language attribute * @param region The region attribute */ private LingualResource(String language,String region){ this.language = language; this.region = region; this.localeCode = makeLocaleCode(language, region); this.locale = new Locale(language,region); resourceBundle = ResourceBundle.getBundle(FILE_NAME,this.locale); instances.put(this.localeCode, this); }; /** * This is a factory method to return a LingualResource. * It first judge if it is has existed in the Map collection, * if it currently has existed in the map, then directly return it. * Otherwise directly new a object. Pay attention to the constructor, * in the constructor code body, the newly constructed object will * be put into the collection * @param language The language attribute. * @param region The region attribute. * @return */ public static synchronized LingualResource getInstance(String language,String region){ System.out.println(instances); if(instances.containsKey(makeLocaleCode(language,region))){ System.out.println(instances.get(makeLocaleCode(language,region)).getClass()); return (LingualResource)instances.get(makeLocaleCode(language,region)); } else { return new LingualResource(language,region); } } /** * This method is to make up the locale code according to the language attribute and the * region attribute * @param language The language attribute * @param region The region attribute. * @return */ private static String makeLocaleCode(String language,String region){ return language + "_" + region; } public String getLanguage() { return language; } public void setLanguage(String language) { this.language = language; } public String getRegion() { return region; } public void setRegion(String region) { this.region = region; } public Locale getLocale() { return locale; } public void setLocale(Locale locale) { this.locale = locale; } public ResourceBundle getResourceBundle() { return resourceBundle; } public void setResourceBundle(ResourceBundle resourceBundle) { this.resourceBundle = resourceBundle; } public String getLocaleString(String code){ return resourceBundle.getString(code); }}
客户端调用代码：
public class LingualResourceTester { public static void main(String[] args) { LingualResource ling = LingualResource.getInstance("en" , "US"); String usDollar = ling.getLocaleString("USD"); System.out.println("USD=" + usDollar); LingualResource lingZh = LingualResource.getInstance("zh" , "CH"); String usDollarZh = lingZh.getLocaleString("USD"); System.out.println("USD=" + usDollarZh); LingualResource lingTwo = LingualResource.getInstance("en" , "US"); String usDollarTwo = lingTwo.getLocaleString("USD"); System.out.println("USD=" + usDollarTwo); LingualResource lingZhTwo = LingualResource.getInstance("zh" , "CH"); String usDollarZhTwo = lingZhTwo.getLocaleString("USD"); System.out.println("USD=" + usDollarZhTwo); }}
本地化文件：
// res_en_US.propertiesUSD=US DollarJPY=Japanese Yen
// res_zh_CH.propertiesUSD=美元JPY=日元
