java: Multion Pattern

 

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/**  * 版权所有 2022 涂聚文有限公司  * 许可信息查看：  * 描述：  * 多例模式 (Multion Patterns)  * 历史版本： JDK 14.02  * 2022-09-12 创建者 geovindu  * 2022-09-12 添加 Lambda  * 2022-09-12 修改：date  * 接口类  * 2022-09-12 修改者：Geovin Du  * 生成API帮助文档的指令：  *javadoc - -encoding Utf-8 -d apidoc LingualResource.java  *https://github.com/TakahikoKawasaki/nv-i18n/blob/master/src/test/java/com/neovisionaries/i18n/LanguageCodeTest.java  * */     package com.javapatterns.multilingual; import java.util.HashMap; import java.util.Locale; import java.util.ResourceBundle; import java.util.Locale; import java.text.NumberFormat;     public class LingualResource {       private String languageCode = "en";     private String regionCode = "US";     private String localeCode = "en_US";     private static final String FILE_NAME = "res";       private static HashMap instances = new HashMap(10);     private Locale locale = null;     private ResourceBundle resourceBundle = null;         private LingualResource lnkLingualResource;       private LingualResource(String languageCode, String regionCode)     {         this.localeCode = languageCode;         this.regionCode = regionCode;         localeCode = makeLocaleCode(languageCode , regionCode);           locale = new Locale(languageCode, regionCode);           resourceBundle = ResourceBundle.getBundle(FILE_NAME, locale);           instances.put( makeLocaleCode(languageCode, regionCode) , resourceBundle);     }       private LingualResource()     {         //do nothing     }       public synchronized static LingualResource getInstance(String language, String region)     {         return new LingualResource( language, region );     }       public String getLocaleString(String code)     {         return resourceBundle.getString(code);     }       private static String makeLocaleCode(String language, String region)     {         return language + "_" + region;     }         static public void displayCurrency(Double amount, Locale currentLocale)     {           NumberFormat formatter;         String amountOut;           formatter = NumberFormat.getCurrencyInstance(currentLocale);         amountOut = formatter.format(amount);           System.out.println(amountOut + "   " + currentLocale.toString());     }     }

　　

调用测试：

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LingualResource.displayCurrency(new Double(1234567.89), new Locale("en", "US")); LingualResource.displayCurrency(new Double(1234567.89), new Locale("de", "DE")); LingualResource.displayCurrency(new Double(1234567.89), new Locale("fr", "FR"));

　　

输出：

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$1,234,567.89   en_US 1.234.567,89 €   de_DE 1 234 567,89 €   fr_FR