程序包 java.util

类 Currency

java.lang.Object

java.util.Currency

所有已实现的接口:

Serializable

public final class Currency
extends Object
implements Serializable

Represents a currency. Currencies are identified by their ISO 4217 currency codes. Visit the ISO web site for more information.

The class is designed so that there's never more than one Currency instance for any given currency. Therefore, there's no public constructor. You obtain a Currency instance using the getInstance methods.

Users can supersede the Java runtime currency data by means of the system property java.util.currency.data. If this system property is defined then its value is the location of a properties file, the contents of which are key/value pairs of the ISO 3166 country codes and the ISO 4217 currency data respectively. The value part consists of three ISO 4217 values of a currency, i.e., an alphabetic code, a numeric code, and a minor unit. Those three ISO 4217 values are separated by commas. The lines which start with '#'s are considered comment lines. An optional UTC timestamp may be specified per currency entry if users need to specify a cutover date indicating when the new data comes into effect. The timestamp is appended to the end of the currency properties and uses a comma as a separator. If a UTC datestamp is present and valid, the JRE will only use the new currency properties if the current UTC date is later than the date specified at class loading time. The format of the timestamp must be of ISO 8601 format : 'yyyy-MM-dd'T'HH:mm:ss'. For example,

#Sample currency properties
JP=JPZ,999,0

will supersede the currency data for Japan.

#Sample currency properties with cutover date
JP=JPZ,999,0,2014-01-01T00:00:00

will supersede the currency data for Japan if Currency class is loaded after 1st January 2014 00:00:00 GMT.

Where syntactically malformed entries are encountered, the entry is ignored and the remainder of entries in file are processed. For instances where duplicate country code entries exist, the behavior of the Currency information for that Currency is undefined and the remainder of entries in file are processed.

从以下版本开始:

1.4

另请参阅:

序列化表格

方法概要

限定符和类型	方法	说明
static Set<Currency>	getAvailableCurrencies()	Gets the set of available currencies.
String	getCurrencyCode()	Gets the ISO 4217 currency code of this currency.
int	getDefaultFractionDigits()	Gets the default number of fraction digits used with this currency.
String	getDisplayName()	Gets the name that is suitable for displaying this currency for the default Locale.Category#DISPLAY locale.
String	getDisplayName(Locale locale)	Gets the name that is suitable for displaying this currency for the specified locale.
static Currency	getInstance(String currencyCode)	Returns the Currency instance for the given currency code.
static Currency	getInstance(Locale locale)	Returns the Currency instance for the country of the given locale.
int	getNumericCode()	Returns the ISO 4217 numeric code of this currency.
String	getSymbol()	Gets the symbol of this currency for the default Locale.Category#DISPLAY locale.
String	getSymbol(Locale locale)	Gets the symbol of this currency for the specified locale.
String	toString()	Returns the ISO 4217 currency code of this currency.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

方法详细资料

getInstance

public static Currency getInstance(String currencyCode)

Returns the Currency instance for the given currency code.

参数:

currencyCode - the ISO 4217 code of the currency

返回:

the Currency instance for the given currency code

抛出:

NullPointerException - if currencyCode is null

IllegalArgumentException - if currencyCode is not a supported ISO 4217 code.

getInstance

public static Currency getInstance(Locale locale)

Returns the Currency instance for the country of the given locale. The language and variant components of the locale are ignored. The result may vary over time, as countries change their currencies. For example, for the original member countries of the European Monetary Union, the method returns the old national currencies until December 31, 2001, and the Euro from January 1, 2002, local time of the respective countries.

The method returns null for territories that don't have a currency, such as Antarctica.

参数:

locale - the locale for whose country a Currency instance is needed

返回:

the Currency instance for the country of the given locale, or null

抛出:

NullPointerException - if locale or its country code is null

IllegalArgumentException - if the country of the given locale is not a supported ISO 3166 country code.

getAvailableCurrencies

public static Set<Currency> getAvailableCurrencies()

Gets the set of available currencies. The returned set of currencies contains all of the available currencies, which may include currencies that represent obsolete ISO 4217 codes. The set can be modified without affecting the available currencies in the runtime.

返回:

the set of available currencies. If there is no currency available in the runtime, the returned set is empty.

从以下版本开始:

1.7

getCurrencyCode

public String getCurrencyCode()

Gets the ISO 4217 currency code of this currency.

返回:

the ISO 4217 currency code of this currency.

getSymbol

public String getSymbol()

Gets the symbol of this currency for the default Locale.Category#DISPLAY locale. For example, for the US Dollar, the symbol is "$" if the default locale is the US, while for other locales it may be "US$". If no symbol can be determined, the ISO 4217 currency code is returned.

This is equivalent to calling getSymbol(Locale.getDefault(Locale.Category.DISPLAY)).

返回:

the symbol of this currency for the default Locale.Category#DISPLAY locale

getSymbol

public String getSymbol(Locale locale)

Gets the symbol of this currency for the specified locale. For example, for the US Dollar, the symbol is "$" if the specified locale is the US, while for other locales it may be "US$". If no symbol can be determined, the ISO 4217 currency code is returned.

参数:

locale - the locale for which a display name for this currency is needed

返回:

the symbol of this currency for the specified locale

抛出:

NullPointerException - if locale is null

getDefaultFractionDigits

public int getDefaultFractionDigits()

Gets the default number of fraction digits used with this currency. For example, the default number of fraction digits for the Euro is 2, while for the Japanese Yen it's 0. In the case of pseudo-currencies, such as IMF Special Drawing Rights, -1 is returned.

返回:

the default number of fraction digits used with this currency

getNumericCode

public int getNumericCode()

Returns the ISO 4217 numeric code of this currency.

返回:

the ISO 4217 numeric code of this currency

从以下版本开始:

1.7

getDisplayName

public String getDisplayName()

Gets the name that is suitable for displaying this currency for the default Locale.Category#DISPLAY locale. If there is no suitable display name found for the default locale, the ISO 4217 currency code is returned.

This is equivalent to calling getDisplayName(Locale.getDefault(Locale.Category.DISPLAY)).

返回:

the display name of this currency for the default Locale.Category#DISPLAY locale

从以下版本开始:

1.7

getDisplayName

public String getDisplayName(Locale locale)

Gets the name that is suitable for displaying this currency for the specified locale. If there is no suitable display name found for the specified locale, the ISO 4217 currency code is returned.

参数:

locale - the locale for which a display name for this currency is needed

返回:

the display name of this currency for the specified locale

抛出:

NullPointerException - if locale is null

从以下版本开始:

1.7

toString

public String toString()

Returns the ISO 4217 currency code of this currency.

覆盖:

toString 在类中 Object

返回:

the ISO 4217 currency code of this currency