Java tutorial
import java.util.Locale; import java.util.spi.CurrencyNameProvider; public class Main extends CurrencyNameProvider { final static Locale[] locales = new Locale[] { new Locale("ti", "ER") }; public Locale[] getAvailableLocales() { return locales; } public String getSymbol(String currencyCode, Locale locale) { if (currencyCode == null || locale == null) throw new NullPointerException(); if (currencyCode.length() != 3) throw new IllegalArgumentException("currency code length not 3"); for (int i = 0; i < 3; i++) if (!Character.isUpperCase(currencyCode.charAt(i))) throw new IllegalArgumentException("bad currency code"); if (!locale.equals(locales[0])) throw new IllegalArgumentException("unsupported locale"); if (currencyCode.equals("ERN")) return "Nfk"; else return null; } }