Класс java.util.Currency был доступен начиная с JDK 1.4 , но JDK 7 предоставил несколько новых полезных методов на уровне класса и экземпляра. Я смотрю на эти новые методы в этом посте.
Класс Currency представляет валюты по всему миру как «идентифицированные их кодами валют ISO 4217», доступными на сайте Международной организации по стандартизации . Хотя можно переопределить представленные валюты, доступные в экземпляре JVM, поместив соответствующий файл свойств в <JAVA_HOME> /lib/currency.properties, большинство из нас, вероятно, будут использовать валюты, предоставляемые «из коробки» с JVM. Легко узнать, что это за доступные валюты, с помощью функции getAvailableCurrencies () нового класса JDK 7 для класса .
Мне нравится, когда JDK предоставляет доступ к деталям JVM во время выполнения. Добавление Currency.getAvailableCurrencies () обеспечивает эту поддержку для валюты, аналогичной той, которая доступна для locales [ Locale.getAvailableLocales () ], часовых поясов [ TimeZone.getAvailableIDs () ], наборов символов [ CharSet.availableCharsets () ] и доступна. Скриптовые движки JVM [ ScriptEngineManager.getEngineFactories () ]. Статическую функцию легко вызвать с помощью однострочного скрипта Groovy, который вызывается напрямую с опцией -e:
groovy -e «Currency.availableCurrencies.each {println it}»
В JDK 7 добавлены три новых метода уровня экземпляра. Два из них [ getDisplayName () и getDisplayName (Locale) ] предоставляют строковое имя экземпляра валюты (один для локали по умолчанию и один для предоставленной локали) , Третий новый метод [ getNumericCode () ] предоставляет int, представляющий числовой код для этого экземпляра валюты.
Следующий листинг кода представляет собой простое Java-приложение, которое запускает все доступные валюты с использованием метода, добавленного в JDK 7, а затем печатает числовой код для каждой валюты вместе с двумя версиями отображаемого имени валюты, как это предусмотрено новыми методами JDK 7.
Пример, демонстрирующий методы JDK 7 для валюты
package dustin.examples;
import static java.lang.System.out;
import java.util.Currency;
import java.util.Locale;
import java.util.Set;
/**
* Demonstrate methods added to java.util.Currency in JDK 7.
*
* @author Dustin
*/
public class Main
{
/**
* Main executable function for demonstrating Currency methods added in JDK 7.
*
* @param arguments The command line arguments; none expected.
*/
public static void main(String[] arguments)
{
final Set<Currency> currencies = Currency.getAvailableCurrencies();
for (final Currency currency : currencies)
{
out.println(
"Currency: "
+ currency.getDisplayName() + "/"
+ currency.getDisplayName(Locale.ITALIAN) + "/"
+ currency.getNumericCode());
}
}
}
Когда вышеперечисленное выполняется на используемой мной JVM, вывод выглядит следующим образом:
Currency: Venezuelan Bolívar/Bolívar venezuelano forte/937 Currency: Colombian Peso/Peso Colombiano/170 Currency: French Franc/Franco Francese/250 Currency: Kyrgystani Som/Som Kirghiso/417 Currency: Euro/Euro/978 Currency: Maltese Lira/Lira Maltese/470 Currency: Georgian Lari/Lari Georgiano/981 Currency: Afghan Afghani (1927-2002)/Afgani (1927-2002)/4 Currency: US Dollar (Next day)/Dollaro Statunitense (Next day)/997 Currency: Mozambican Metical/Metical del Mozambico/943 Currency: Dutch Guilder/Fiorino Olandese/528 Currency: Panamanian Balboa/Balboa di Panama/590 Currency: Qatari Rial/Rial del Qatar/634 Currency: Bahamian Dollar/Dollaro delle Bahamas/44 Currency: Djiboutian Franc/Franco Gibutiano/262 Currency: Serbian Dinar (2002-2006)/Serbian Dinar (2002-2006)/891 Currency: New Zealand Dollar/Dollaro Neozelandese/554 Currency: Syrian Pound/Sterlina Siriana/760 Currency: Malagasy Franc/Franco Malgascio/450 Currency: Venezuelan Bolívar (1871-2008)/Bolivar Venezuelano/862 Currency: Saudi Riyal/Ryal Saudita/682 Currency: Rwandan Franc/Franco Ruandese/646 Currency: Yemeni Rial/Rial dello Yemen/886 Currency: Barbadian Dollar/Dollaro di Barbados/52 Currency: Sierra Leonean Leone/Leone della Sierra Leone/694 Currency: Sri Lankan Rupee/Rupia di Sri Lanka/144 Currency: Chilean Peso/Peso Cileno/152 Currency: Bermudan Dollar/Dollaro delle Bermuda/60 Currency: Omani Rial/Rial Omanita/512 Currency: Myanma Kyat/Kyat di Myanmar/104 Currency: Gambian Dalasi/Dalasi del Gambia/270 Currency: Guatemalan Quetzal/Quetzal Guatemalteco/320 Currency: CFP Franc/Franco CFP/953 Currency: Turkmenistani Manat (1993-2009)/Manat Turkmeno/795 Currency: Romanian Leu/Romanian Leu/946 Currency: Singapore Dollar/Dollaro di Singapore/702 Currency: Jamaican Dollar/Dollaro Giamaicano/388 Currency: Bolivian Boliviano/Boliviano/68 Currency: Eritrean Nakfa/Nakfa Eritreo/232 Currency: Turkmenistani Manat/Turkmenistani Manat/934 Currency: Mongolian Tugrik/Tugrik Mongolo/496 Currency: Indonesian Rupiah/Rupia Indonesiana/360 Currency: ZWN/ZWN/942 Currency: Luxembourgian Franc/Franco del Lussemburgo/442 Currency: Russian Ruble (1991-1998)/Rublo della CSI/810 Currency: São Tomé and Príncipe Dobra/Dobra di Sao Tomé e Principe/678 Currency: Ukrainian Hryvnia/Hrivna Ucraina/980 Currency: Argentine Peso/Peso Argentino/32 Currency: Bahraini Dinar/Dinaro del Bahraini/48 Currency: Belize Dollar/Dollaro Belize/84 Currency: Russian Ruble/Rublo Russo/643 Currency: Laotian Kip/Kip Laotiano/418 Currency: Maldivian Rufiyaa/Rufiyaa delle Maldive/462 Currency: Libyan Dinar/Dinaro Libico/434 Currency: Sudanese Dinar (1992-2007)/Dinaro Sudanese/736 Currency: Danish Krone/Corona Danese/208 Currency: Zimbabwean Dollar (2008)/Zimbabwean Dollar (2008)/935 Currency: Spanish Peseta/Peseta Spagnola/724 Currency: Macanese Pataca/Pataca di Macao/446 Currency: Surinamese Guilder/Fiorino del Suriname/740 Currency: Samoan Tala/Tala della Samoa Occidentale/882 Currency: Swazi Lilangeni/Lilangeni dello Swaziland/748 Currency: Tanzanian Shilling/Scellino della Tanzania/834 Currency: Portuguese Escudo/Escudo Portoghese/620 Currency: XUA/XUA/965 Currency: Armenian Dram/Dram Armeno/51 Currency: Greek Drachma/Dracma Greca/300 Currency: Guinean Franc/Franco della Guinea/324 Currency: Nicaraguan Córdoba/Córdoba oro nicaraguense/558 Currency: Gibraltar Pound/Sterlina di Gibilterra/292 Currency: Bolivian Mvdol/Mvdol Boliviano/984 Currency: Bulgarian Lev/Nuovo Lev Bulgaro/975 Currency: Belgian Franc/Franco Belga/56 Currency: Kazakhstani Tenge/Tenge Kazaco/398 Currency: Solomon Islands Dollar/Dollaro delle Isole Solomon/90 Currency: Costa Rican Colón/Colón Costaricano/188 Currency: Swiss Franc/Franco Svizzero/756 Currency: Turkish Lira/Turkish Lira/949 Currency: Australian Dollar/Dollaro Australiano/36 Currency: CFA Franc BCEAO/Franco CFA BCEAO/952 Currency: Uzbekistan Som/Sum dell’Uzbekistan/860 Currency: European Unit of Account (XBD)/Unità di acconto europea (XBD)/958 Currency: Chinese Yuan/Renmimbi Cinese/156 Currency: Malawian Kwacha/Kwacha Malawiano/454 Currency: Bhutanese Ngultrum/Ngultrum Butanese/64 Currency: Zimbabwean Dollar (2009)/Zimbabwean Dollar (2009)/932 Currency: Special Drawing Rights/Diritti Speciali di Incasso/960 Currency: Italian Lira/Lira Italiana/380 Currency: Moroccan Dirham/Dirham Marocchino/504 Currency: Chilean Unit of Account (UF)/Unidades de Fomento Chilene/990 Currency: Lesotho Loti/Loti del Lesotho/426 Currency: Nigerian Naira/Naira Nigeriana/566 Currency: Guinea-Bissau Peso/Peso della Guinea-Bissau/624 Currency: Sudanese Pound/Sterlina sudanese/938 Currency: Lebanese Pound/Sterlina Libanese/422 Currency: Mauritian Rupee/Rupia Mauriziana/480 Currency: Testing Currency Code/Testing Currency Code/963 Currency: Latvian Lats/Lat Lettone/428 Currency: Japanese Yen/Yen Giapponese/392 Currency: Turkish Lira (1922-2005)/Lira Turca/792 Currency: Norwegian Krone/Corona Norvegese/578 Currency: Indian Rupee/Rupia Indiana/356 Currency: Hungarian Forint/Fiorino Ungherese/348 Currency: Tunisian Dinar/Dinaro Tunisino/788 Currency: Congolese Franc/Franco Congolese/976 Currency: Andorran Peseta/Peseta Andorrana/20 Currency: Palladium/Palladio/964 Currency: Liberian Dollar/Dollaro Liberiano/430 Currency: Netherlands Antillean Guilder/Fiorino delle Antille Olandesi/532 Currency: US Dollar (Same day)/Dollaro Statunitense (Same day)/998 Currency: Somali Shilling/Scellino Somalo/706 Currency: Mexican Peso/Peso Messicano/484 Currency: Zimbabwean Dollar (1980-2008)/Dollaro dello Zimbabwe/716 Currency: British Pound Sterling/Sterlina Inglese/826 Currency: Albanian Lek/Lek Albanese/8 Currency: Jordanian Dinar/Dinaro Giordano/400 Currency: East Caribbean Dollar/Dollaro dei Caraibi Orientali/951 Currency: Cuban Convertible Peso/Cuban Convertible Peso/931 Currency: Gold/Oro/959 Currency: Czech Republic Koruna/Corona Ceca/203 Currency: US Dollar/Dollaro Statunitense/840 Currency: Cuban Peso/Peso Cubano/192 Currency: Comorian Franc/Franco Comoriano/174 Currency: Pakistani Rupee/Rupia del Pakistan/586 Currency: Fijian Dollar/Dollaro delle Figi/242 Currency: French UIC-Franc/Franco UIC Francese/0 Currency: Vietnamese Dong/Dong Vietnamita/704 Currency: Honduran Lempira/Lempira Hoduregno/340 Currency: Brunei Dollar/Dollaro del Brunei/96 Currency: Finnish Markka/Markka Finlandese/246 Currency: European Monetary Unit/Unità monetaria europea/956 Currency: United Arab Emirates Dirham/Dirham degli Emirati Arabi Uniti/784 Currency: Algerian Dinar/Dinaro Algerino/12 Currency: South African Rand/Rand Sudafricano/710 Currency: Burundian Franc/Franco del Burundi/108 Currency: Bangladeshi Taka/Taka Bangladese/50 Currency: Paraguayan Guarani/Guarani del Paraguay/600 Currency: XSU/XSU/994 Currency: Peruvian Nuevo Sol/Sol Nuevo Peruviano/604 Currency: Ghanaian Cedi (1979-2007)/Cedi del Ghana/288 Currency: North Korean Won/Won Nordcoreano/408 Currency: Slovenian Tolar/Tallero Sloveno/705 Currency: Philippine Peso/Peso delle Filippine/608 Currency: Mauritanian Ouguiya/Ouguiya della Mauritania/478 Currency: Unknown Currency/Nessuna valuta/999 Currency: Azerbaijani Manat (1993-2006)/Manat Azero (1993-2006)/31 Currency: Cayman Islands Dollar/Dollaro delle Isole Cayman/136 Currency: Croatian Kuna/Kuna Croata/191 Currency: Botswanan Pula/Pula del Botswana/72 Currency: Saint Helena Pound/Sterlina di Sant’Elena/654 Currency: AYM/AYM/945 Currency: Ugandan Shilling/Scellino Ugandese/800 Currency: Austrian Schilling/Scellino Austriaco/40 Currency: Malaysian Ringgit/Ringgit della Malesia/458 Currency: French Gold Franc/Franco Oro Francese/0 Currency: Irish Pound/Sterlina irlandese/372 Currency: Vanuatu Vatu/Vatu di Vanuatu/548 Currency: Serbian Dinar/Dinaro serbo/941 Currency: Iranian Rial/Rial Iraniano/364 Currency: Timorese Escudo/Escudo di Timor/626 Currency: Mexican Investment Unit/Unidad de Inversion (UDI) Messicana/979 Currency: Iraqi Dinar/Dinaro Iracheno/368 Currency: Romanian Leu (1952-2006)/Leu della Romania/946 Currency: Moldovan Leu/Leu Moldavo/498 Currency: Slovak Koruna/Corona Slovacca/703 Currency: Israeli New Sheqel/Nuovo sheqel israeliano/376 Currency: Polish Zloty/Zloty Polacco/985 Currency: Seychellois Rupee/Rupia delle Seychelles/690 Currency: European Unit of Account (XBC)/Unità di acconto europea (XBC)/957 Currency: Yugoslavian New Dinar (1994-2002)/Dinaro Noviy Yugoslavo/891 Currency: Macedonian Denar/Dinaro Macedone/807 Currency: Belarusian Ruble/Rublo Bielorussia/974 Currency: Egyptian Pound/Sterlina Egiziana/818 Currency: Hong Kong Dollar/Dollaro di Hong Kong/344 Currency: Guyanaese Dollar/Dollaro della Guyana/328 Currency: Bosnia-Herzegovina Convertible Mark/Marco Conv. Bosnia-Erzegovina/977 Currency: Thai Baht/Baht Tailandese/764 Currency: Kuwaiti Dinar/Dinaro Kuwaitiano/414 Currency: Kenyan Shilling/Scellino Keniota/404 Currency: Icelandic Króna/Corona Islandese/352 Currency: Falkland Islands Pound/Sterlina delle Falkland/238 Currency: Angolan Kwanza/Kwanza Angolano/973 Currency: Bulgarian Hard Lev/Lev Bulgaro/100 Currency: Malagasy Ariary/Ariary Malgascio/969 Currency: Surinamese Dollar/Dollaro surinamese/968 Currency: Dominican Peso/Peso Dominicano/214 Currency: Tongan Pa?anga/Pa?anga di Tonga/776 Currency: Papua New Guinean Kina/Kina della Papua Nuova Guinea/598 Currency: Cape Verdean Escudo/Escudo del Capo Verde/132 Currency: Namibian Dollar/Dollaro Namibiano/516 Currency: Uruguayan Peso/Peso Uruguayo uruguaiano/858 Currency: Ethiopian Birr/Birr Etiopico/230 Currency: Trinidad and Tobago Dollar/Dollaro di Trinidad e Tobago/780 Currency: Salvadoran Colón/Colón Salvadoregno/222 Currency: Brazilian Real/Real Brasiliano/986 Currency: Silver/Argento/961 Currency: Tajikistani Somoni/Somoni del Tajikistan/972 Currency: European Composite Unit/Unità composita europea/955 Currency: Lithuanian Litas/Lita Lituana/440 Currency: Estonian Kroon/Corona dell’Estonia/233 Currency: Platinum/Platinum/962 Currency: Haitian Gourde/Gourde Haitiano/332 Currency: Belarusian New Ruble (1994-1999)/Nuovo Rublo Bielorussia (1994-1999)/112 Currency: South Korean Won/Won Sudcoreano/410 Currency: Azerbaijani Manat/Azerbaijani Manat/944 Currency: Nepalese Rupee/Rupia Nepalese/524 Currency: Cambodian Riel/Riel Cambogiano/116 Currency: Zambian Kwacha/Kwacha dello Zambia/894 Currency: New Taiwan Dollar/Nuovo dollaro taiwanese/901 Currency: CFA Franc BEAC/Franco CFA BEAC/950 Currency: Cypriot Pound/Sterlina Cipriota/196 Currency: Afghan Afghani/Afgani/971 Currency: Aruban Florin/Fiorino di Aruba/533 Currency: Canadian Dollar/Dollaro Canadese/124 Currency: Mozambican Metical (1980-2006)/Mozambican Metical (1980-2006)/508 Currency: Ghanaian Cedi/Cedi ghanese/936 Currency: German Mark/Marco Tedesco/276 Currency: Swedish Krona/Corona Svedese/752
В этом сообщении в блоге кратко рассматриваются новый метод уровня класса и три новых метода уровня экземпляра, добавленных в класс Currency.