ULocale (ICU4J 51.2)

java.lang.Object
- com.ibm.icu.util.ULocale

All Implemented Interfaces:

Serializable
```
public final class ULocale
extends Object
implements Serializable
```
[icu enhancement] ICU's replacement for java.util.Locale. Methods, fields, and other functionality specific to ICU are labeled '[icu]'.
A class analogous to Locale that provides additional support for ICU protocol. In ICU 3.0 this class is enhanced to support RFC 3066 language identifiers.
Many classes and services in ICU follow a factory idiom, in which a factory method or object responds to a client request with an object. The request includes a locale (the requested locale), and the returned object is constructed using data for that locale. The system may lack data for the requested locale, in which case the locale fallback mechanism will be invoked until a populated locale is found (the valid locale). Furthermore, even when a populated locale is found (the valid locale), further fallback may be required to reach a locale containing the specific data required by the service (the actual locale).
ULocale performs 'normalization' and 'canonicalization' of locale ids. Normalization 'cleans up' ICU locale ids as follows:
- language, script, country, variant, and keywords are properly cased
  (lower, title, upper, upper, and lower case respectively)
- hyphens used as separators are converted to underscores
- three-letter language and country ids are converted to two-letter equivalents where available
- surrounding spaces are removed from keywords and values
- if there are multiple keywords, they are put in sorted order
Canonicalization additionally performs the following:
- POSIX ids are converted to ICU format IDs
- 'grandfathered' 3066 ids are converted to ICU standard form
- 'PREEURO' and 'EURO' variants are converted to currency keyword form, with the currency id appropriate to the country of the locale (for PREEURO) or EUR (for EURO).
All ULocale constructors automatically normalize the locale id. To handle POSIX ids, canonicalize can be called to convert the id to canonical form, or the canonicalInstance factory method can be called.

This class provides selectors VALID_LOCALE and ACTUAL_LOCALE intended for use in methods named getLocale(). These methods exist in several ICU classes, including Calendar, Currency, UFormat, BreakIterator, Collator, DateFormatSymbols, and DecimalFormatSymbols and their subclasses, if any. Once an object of one of these classes has been created, getLocale() may be called on it to determine the valid and actual locale arrived at during the object's construction.
Note: The actual locale is returned correctly, but the valid locale is not, in most cases.
Author:

weiv, Alan Liu, Ram Viswanadha

See Also:
Locale, Serialized Form
Status:
Stable ICU 2.8.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`ULocale.Builder` `Builder` is used to build instances of `ULocale` from values configured by the setters.
`static class`	`ULocale.Category` Enum for locale categories.
`static class`	`ULocale.Type` Opaque selector enum for `getLocale()`.

Field Summary

Fields
Modifier and Type	Field and Description
`static ULocale.Type`	`ACTUAL_LOCALE` [icu] Selector for `getLocale()` indicating the locale of the resource containing the data.
`static ULocale`	`CANADA` Useful constant for country/region.
`static ULocale`	`CANADA_FRENCH` Useful constant for country/region.
`static ULocale`	`CHINA` Useful constant for country/region.
`static ULocale`	`CHINESE` Useful constant for language.
`static ULocale`	`ENGLISH` Useful constant for language.
`static ULocale`	`FRANCE` Useful constant for country/region.
`static ULocale`	`FRENCH` Useful constant for language.
`static ULocale`	`GERMAN` Useful constant for language.
`static ULocale`	`GERMANY` Useful constant for country/region.
`static ULocale`	`ITALIAN` Useful constant for language.
`static ULocale`	`ITALY` Useful constant for country/region.
`static ULocale`	`JAPAN` Useful constant for country/region.
`static ULocale`	`JAPANESE` Useful constant for language.
`static ULocale`	`KOREA` Useful constant for country/region.
`static ULocale`	`KOREAN` Useful constant for language.
`static ULocale`	`PRC` Useful constant for country/region.
`static char`	`PRIVATE_USE_EXTENSION` [icu] The key for the private use locale extension ('x').
`static ULocale`	`ROOT` The root ULocale.
`static ULocale`	`SIMPLIFIED_CHINESE` Useful constant for language.
`static ULocale`	`TAIWAN` Useful constant for country/region.
`static ULocale`	`TRADITIONAL_CHINESE` Useful constant for language.
`static ULocale`	`UK` Useful constant for country/region.
`static char`	`UNICODE_LOCALE_EXTENSION` [icu] The key for Unicode locale extension ('u').
`static ULocale`	`US` Useful constant for country/region.
`static ULocale.Type`	`VALID_LOCALE` [icu] Selector for `getLocale()` indicating the most specific locale for which any data exists.

Constructor Summary

Constructors
Constructor and Description
`ULocale(String localeID)` [icu] Constructs a ULocale from a RFC 3066 locale ID.
`ULocale(String a, String b)` Convenience overload of ULocale(String, String, String) for compatibility with java.util.Locale.
`ULocale(String a, String b, String c)` Constructs a ULocale from a localeID constructed from the three 'fields' a, b, and c.

Method Summary

Methods
Modifier and Type	Method and Description
`static ULocale`	`acceptLanguage(String acceptLanguageList, boolean[] fallback)` [icu] Based on a HTTP formatted list of acceptable locales, determine an available locale for the user.
`static ULocale`	`acceptLanguage(String acceptLanguageList, ULocale[] availableLocales, boolean[] fallback)` [icu] Based on a HTTP formatted list of acceptable locales, determine an available locale for the user.
`static ULocale`	`acceptLanguage(ULocale[] acceptLanguageList, boolean[] fallback)` [icu] Based on an ordered array of acceptable locales, determine an available locale for the user.
`static ULocale`	`acceptLanguage(ULocale[] acceptLanguageList, ULocale[] availableLocales, boolean[] fallback)` [icu] Based on a list of acceptable locales, determine an available locale for the user.
`static ULocale`	`addLikelySubtags(ULocale loc)` [icu] Adds the likely subtags for a provided locale ID, per the algorithm described in the following CLDR technical report: http://www.unicode.org/reports/tr35/#Likely_Subtags If the provided ULocale instance is already in the maximal form, or there is no data available available for maximization, it will be returned.
`static String`	`canonicalize(String localeID)` [icu] Returns the canonical name for the specified locale ID.
`Object`	`clone()` This is for compatibility with Locale-- in actuality, since ULocale is immutable, there is no reason to clone it, so this API returns 'this'.
`static ULocale`	`createCanonical(String nonCanonicalID)` [icu] Creates a ULocale from the id by first canonicalizing the id.
`boolean`	`equals(Object obj)` Returns true if the other object is another ULocale with the same full name.
`static ULocale`	`forLanguageTag(String languageTag)` [icu] Returns a locale for the specified IETF BCP 47 language tag string.
`static ULocale`	`forLocale(Locale loc)` [icu] Returns a ULocale object for a `Locale`.
`static ULocale[]`	`getAvailableLocales()` [icu] Note: Unlike the Locale API, this returns an array of `ULocale`, not `Locale`.
`String`	`getBaseName()` [icu] Returns the (normalized) base name for this locale.
`static String`	`getBaseName(String localeID)` [icu] Returns the (normalized) base name for the specified locale.
`String`	`getCharacterOrientation()` [icu] Returns this locale's layout orientation for characters.
`String`	`getCountry()` Returns the country/region code for this locale, which will either be the empty string or an uppercase ISO 3166 2-letter code.
`static String`	`getCountry(String localeID)` Returns the country/region code for this locale, which will either be the empty string or an uppercase ISO 3166 2-letter code.
`static ULocale`	`getDefault()` Returns the current default ULocale.
`static ULocale`	`getDefault(ULocale.Category category)` Returns the current default ULocale for the specified category.
`String`	`getDisplayCountry()` Returns this locale's country localized for display in the default `DISPLAY` locale.
`static String`	`getDisplayCountry(String localeID, String displayLocaleID)` Returns a locale's country localized for display in the provided locale.
`static String`	`getDisplayCountry(String localeID, ULocale displayLocale)` Returns a locale's country localized for display in the provided locale.
`String`	`getDisplayCountry(ULocale displayLocale)` Returns this locale's country localized for display in the provided locale.
`static String`	`getDisplayKeyword(String keyword)` [icu] Returns a keyword localized for display in the default `DISPLAY` locale.
`static String`	`getDisplayKeyword(String keyword, String displayLocaleID)` [icu] Returns a keyword localized for display in the specified locale.
`static String`	`getDisplayKeyword(String keyword, ULocale displayLocale)` [icu] Returns a keyword localized for display in the specified locale.
`String`	`getDisplayKeywordValue(String keyword)` [icu] Returns a keyword value localized for display in the default `DISPLAY` locale.
`static String`	`getDisplayKeywordValue(String localeID, String keyword, String displayLocaleID)` [icu] Returns a keyword value localized for display in the specified locale.
`static String`	`getDisplayKeywordValue(String localeID, String keyword, ULocale displayLocale)` [icu] Returns a keyword value localized for display in the specified locale.
`String`	`getDisplayKeywordValue(String keyword, ULocale displayLocale)` [icu] Returns a keyword value localized for display in the specified locale.
`String`	`getDisplayLanguage()` Returns this locale's language localized for display in the default `DISPLAY` locale.
`static String`	`getDisplayLanguage(String localeID, String displayLocaleID)` Returns a locale's language localized for display in the provided locale.
`static String`	`getDisplayLanguage(String localeID, ULocale displayLocale)` Returns a locale's language localized for display in the provided locale.
`String`	`getDisplayLanguage(ULocale displayLocale)` [icu] Returns this locale's language localized for display in the provided locale.
`String`	`getDisplayLanguageWithDialect()` [icu] Returns this locale's language localized for display in the default `DISPLAY` locale.
`static String`	`getDisplayLanguageWithDialect(String localeID, String displayLocaleID)` [icu] Returns a locale's language localized for display in the provided locale.
`static String`	`getDisplayLanguageWithDialect(String localeID, ULocale displayLocale)` [icu] Returns a locale's language localized for display in the provided locale.
`String`	`getDisplayLanguageWithDialect(ULocale displayLocale)` [icu] Returns this locale's language localized for display in the provided locale.
`String`	`getDisplayName()` Returns this locale name localized for display in the default `DISPLAY` locale.
`static String`	`getDisplayName(String localeID, String displayLocaleID)` Returns the locale ID localized for display in the provided locale.
`static String`	`getDisplayName(String localeID, ULocale displayLocale)` Returns the locale ID localized for display in the provided locale.
`String`	`getDisplayName(ULocale displayLocale)` Returns this locale name localized for display in the provided locale.
`String`	`getDisplayNameWithDialect()` [icu] Returns this locale name localized for display in the default `DISPLAY` locale.
`static String`	`getDisplayNameWithDialect(String localeID, String displayLocaleID)` [icu] Returns the locale ID localized for display in the provided locale.
`static String`	`getDisplayNameWithDialect(String localeID, ULocale displayLocale)` [icu] Returns the locale ID localized for display in the provided locale.
`String`	`getDisplayNameWithDialect(ULocale displayLocale)` [icu] Returns this locale name localized for display in the provided locale.
`String`	`getDisplayScript()` [icu] Returns this locale's script localized for display in the default `DISPLAY` locale.
`static String`	`getDisplayScript(String localeID, String displayLocaleID)` [icu] Returns a locale's script localized for display in the provided locale.
`static String`	`getDisplayScript(String localeID, ULocale displayLocale)` [icu] Returns a locale's script localized for display in the provided locale.
`String`	`getDisplayScript(ULocale displayLocale)` [icu] Returns this locale's script localized for display in the provided locale.
`String`	`getDisplayScriptInContext()` Deprecated. This API is ICU internal only.
`static String`	`getDisplayScriptInContext(String localeID, String displayLocaleID)` Deprecated. This API is ICU internal only.
`static String`	`getDisplayScriptInContext(String localeID, ULocale displayLocale)` Deprecated. This API is ICU internal only.
`String`	`getDisplayScriptInContext(ULocale displayLocale)` Deprecated. This API is ICU internal only.
`String`	`getDisplayVariant()` Returns this locale's variant localized for display in the default `DISPLAY` locale.
`static String`	`getDisplayVariant(String localeID, String displayLocaleID)` Returns a locale's variant localized for display in the provided locale.
`static String`	`getDisplayVariant(String localeID, ULocale displayLocale)` Returns a locale's variant localized for display in the provided locale.
`String`	`getDisplayVariant(ULocale displayLocale)` Returns this locale's variant localized for display in the provided locale.
`String`	`getExtension(char key)` [icu] Returns the extension (or private use) value associated with the specified key, or null if there is no extension associated with the key.
`Set<Character>`	`getExtensionKeys()` [icu] Returns the set of extension keys associated with this locale, or the empty set if it has no extensions.
`ULocale`	`getFallback()` [icu] Returns the fallback locale for this locale.
`static String`	`getFallback(String localeID)` [icu] Returns the fallback locale for the specified locale, which might be the empty string.
`String`	`getISO3Country()` Returns a three-letter abbreviation for this locale's country/region.
`static String`	`getISO3Country(String localeID)` Returns a three-letter abbreviation for this locale's country/region.
`String`	`getISO3Language()` Returns a three-letter abbreviation for this locale's language.
`static String`	`getISO3Language(String localeID)` Returns a three-letter abbreviation for this locale's language.
`static String[]`	`getISOCountries()` Returns a list of all 2-letter country codes defined in ISO 3166.
`static String[]`	`getISOLanguages()` Returns a list of all 2-letter language codes defined in ISO 639.
`Iterator<String>`	`getKeywords()` [icu] Returns an iterator over keywords for this locale.
`static Iterator<String>`	`getKeywords(String localeID)` [icu] Returns an iterator over keywords for the specified locale.
`String`	`getKeywordValue(String keywordName)` [icu] Returns the value for a keyword in this locale.
`static String`	`getKeywordValue(String localeID, String keywordName)` [icu] Returns the value for a keyword in the specified locale.
`String`	`getLanguage()` Returns the language code for this locale, which will either be the empty string or a lowercase ISO 639 code.
`static String`	`getLanguage(String localeID)` Returns the language code for the locale ID, which will either be the empty string or a lowercase ISO 639 code.
`String`	`getLineOrientation()` [icu] Returns this locale's layout orientation for lines.
`String`	`getName()` [icu] Returns the (normalized) full name for this locale.
`static String`	`getName(String localeID)` [icu] Returns the (normalized) full name for the specified locale.
`String`	`getScript()` [icu] Returns the script code for this locale, which might be the empty string.
`static String`	`getScript(String localeID)` [icu] Returns the script code for the specified locale, which might be the empty string.
`Set<String>`	`getUnicodeLocaleAttributes()` [icu] Returns the set of unicode locale attributes associated with this locale, or the empty set if it has no attributes.
`Set<String>`	`getUnicodeLocaleKeys()` [icu] Returns the set of Unicode locale keys defined by this locale, or the empty set if this locale has none.
`String`	`getUnicodeLocaleType(String key)` [icu] Returns the Unicode locale type associated with the specified Unicode locale key for this locale.
`String`	`getVariant()` Returns the variant code for this locale, which might be the empty string.
`static String`	`getVariant(String localeID)` Returns the variant code for the specified locale, which might be the empty string.
`int`	`hashCode()` Returns the hashCode.
`static ULocale`	`minimizeSubtags(ULocale loc)` [icu] Minimizes the subtags for a provided locale ID, per the algorithm described in the following CLDR technical report: http://www.unicode.org/reports/tr35/#Likely_Subtags If the provided ULocale instance is already in the minimal form, or there is no data available for minimization, it will be returned.
`static void`	`setDefault(ULocale.Category category, ULocale newLocale)` Sets the default `ULocale` for the specified `Category`.
`static void`	`setDefault(ULocale newLocale)` [icu] Sets the default ULocale.
`ULocale`	`setKeywordValue(String keyword, String value)` Given a keyword and a value, return a new locale with an updated keyword and value.
`static String`	`setKeywordValue(String localeID, String keyword, String value)` Given a locale id, a keyword, and a value, return a new locale id with an updated keyword and value.
`String`	`toLanguageTag()` [icu] Returns a well-formed IETF BCP 47 language tag representing this locale.
`Locale`	`toLocale()` [icu] Converts this ULocale object to a `Locale`.
`String`	`toString()` Returns a string representation of this object.

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail
- ENGLISH
```
public static final ULocale ENGLISH
```
  Useful constant for language.
  
  Status:
  Stable ICU 3.0.
- FRENCH
```
public static final ULocale FRENCH
```
  Useful constant for language.
  
  Status:
  Stable ICU 3.0.
- GERMAN
```
public static final ULocale GERMAN
```
  Useful constant for language.
  
  Status:
  Stable ICU 3.0.
- ITALIAN
```
public static final ULocale ITALIAN
```
  Useful constant for language.
  
  Status:
  Stable ICU 3.0.
- JAPANESE
```
public static final ULocale JAPANESE
```
  Useful constant for language.
  
  Status:
  Stable ICU 3.0.
- KOREAN
```
public static final ULocale KOREAN
```
  Useful constant for language.
  
  Status:
  Stable ICU 3.0.
- CHINESE
```
public static final ULocale CHINESE
```
  Useful constant for language.
  
  Status:
  Stable ICU 3.0.
- SIMPLIFIED_CHINESE
```
public static final ULocale SIMPLIFIED_CHINESE
```
  Useful constant for language.
  
  Status:
  Stable ICU 3.0.
- TRADITIONAL_CHINESE
```
public static final ULocale TRADITIONAL_CHINESE
```
  Useful constant for language.
  
  Status:
  Stable ICU 3.0.
- FRANCE
```
public static final ULocale FRANCE
```
  Useful constant for country/region.
  
  Status:
  Stable ICU 3.0.
- GERMANY
```
public static final ULocale GERMANY
```
  Useful constant for country/region.
  
  Status:
  Stable ICU 3.0.
- ITALY
```
public static final ULocale ITALY
```
  Useful constant for country/region.
  
  Status:
  Stable ICU 3.0.
- JAPAN
```
public static final ULocale JAPAN
```
  Useful constant for country/region.
  
  Status:
  Stable ICU 3.0.
- KOREA
```
public static final ULocale KOREA
```
  Useful constant for country/region.
  
  Status:
  Stable ICU 3.0.
- CHINA
```
public static final ULocale CHINA
```
  Useful constant for country/region.
  
  Status:
  Stable ICU 3.0.
- PRC
```
public static final ULocale PRC
```
  Useful constant for country/region.
  
  Status:
  Stable ICU 3.0.
- TAIWAN
```
public static final ULocale TAIWAN
```
  Useful constant for country/region.
  
  Status:
  Stable ICU 3.0.
- UK
```
public static final ULocale UK
```
  Useful constant for country/region.
  
  Status:
  Stable ICU 3.0.
- US
```
public static final ULocale US
```
  Useful constant for country/region.
  
  Status:
  Stable ICU 3.0.
- CANADA
```
public static final ULocale CANADA
```
  Useful constant for country/region.
  
  Status:
  Stable ICU 3.0.
- CANADA_FRENCH
```
public static final ULocale CANADA_FRENCH
```
  Useful constant for country/region.
  
  Status:
  Stable ICU 3.0.
- ROOT
```
public static final ULocale ROOT
```
  The root ULocale.
  
  Status:
  Stable ICU 2.8.
- ACTUAL_LOCALE
```
public static ULocale.Type ACTUAL_LOCALE
```
  [icu] Selector for getLocale() indicating the locale of the resource containing the data. This is always at or above the valid locale. If the valid locale does not contain the specific data being requested, then the actual locale will be above the valid locale. If the object was not constructed from locale data, then the valid locale is null.
  
  Status:
  Draft ICU 2.8 (retain).
- VALID_LOCALE
```
public static ULocale.Type VALID_LOCALE
```
  [icu] Selector for getLocale() indicating the most specific locale for which any data exists. This is always at or above the requested locale, and at or below the actual locale. If the requested locale does not correspond to any resource data, then the valid locale will be above the requested locale. If the object was not constructed from locale data, then the actual locale is null.
  Note: The valid locale will be returned correctly in ICU 3.0 or later. In ICU 2.8, it is not returned correctly.
  
  Status:
  Draft ICU 2.8 (retain).
- PRIVATE_USE_EXTENSION
```
public static final char PRIVATE_USE_EXTENSION
```
  [icu] The key for the private use locale extension ('x').
  
  See Also:
  getExtension(char), ULocale.Builder.setExtension(char, String), Constant Field Values
  Status:
  Stable ICU 4.2.
- UNICODE_LOCALE_EXTENSION
```
public static final char UNICODE_LOCALE_EXTENSION
```
  [icu] The key for Unicode locale extension ('u').
  
  See Also:
  getExtension(char), ULocale.Builder.setExtension(char, String), Constant Field Values
  Status:
  Stable ICU 4.2.

Constructor Detail
- ULocale
```
public ULocale(String localeID)
```
  [icu] Constructs a ULocale from a RFC 3066 locale ID. The locale ID consists of optional language, script, country, and variant fields in that order, separated by underscores, followed by an optional keyword list. The script, if present, is four characters long-- this distinguishes it from a country code, which is two characters long. Other fields are distinguished by position as indicated by the underscores. The start of the keyword list is indicated by '@', and consists of two or more keyword/value pairs separated by semicolons(';').
  This constructor does not canonicalize the localeID. So, for example, "zh__pinyin" remains unchanged instead of converting to "zh@collation=pinyin". By default ICU only recognizes the latter as specifying pinyin collation. Use createCanonical(java.lang.String) or canonicalize(java.lang.String) if you need to canonicalize the localeID.
  
  Parameters:
  localeID - string representation of the locale, e.g: "en_US", "sy_Cyrl_YU", "zh__pinyin", "es_ES@currency=EUR;collation=traditional"
  Status:
  Stable ICU 2.8.
- ULocale
```
public ULocale(String a,
       String b)
```
  Convenience overload of ULocale(String, String, String) for compatibility with java.util.Locale.
  
  See Also:
  ULocale(String, String, String)
  Status:
  Stable ICU 3.4.
- ULocale
```
public ULocale(String a,
       String b,
       String c)
```
  Constructs a ULocale from a localeID constructed from the three 'fields' a, b, and c. These fields are concatenated using underscores to form a localeID of the form a_b_c, which is then handled like the localeID passed to ULocale(String localeID).
  Java locale strings consisting of language, country, and variant will be handled by this form, since the country code (being shorter than four letters long) will not be interpreted as a script code. If a script code is present, the final argument ('c') will be interpreted as the country code. It is recommended that this constructor only be used to ease porting, and that clients instead use the single-argument constructor when constructing a ULocale from a localeID.
  
  Parameters:
  a - first component of the locale id
  b - second component of the locale id
  c - third component of the locale id
  See Also:
  ULocale(String)
  Status:
  Stable ICU 3.0.

Method Detail

forLocale
```
public static ULocale forLocale(Locale loc)
```
[icu] Returns a ULocale object for a Locale. The ULocale is canonicalized.

Parameters:
loc - a JDK locale
Status:
Stable ICU 3.2.

createCanonical
```
public static ULocale createCanonical(String nonCanonicalID)
```
[icu] Creates a ULocale from the id by first canonicalizing the id.

Parameters:
nonCanonicalID - the locale id to canonicalize

Returns:
the locale created from the canonical version of the ID.
Status:
Stable ICU 3.0.

toLocale
```
public Locale toLocale()
```
[icu] Converts this ULocale object to a Locale.

Returns:
a JDK locale that either exactly represents this object or is the closest approximation.
Status:
Stable ICU 2.8.

getDefault
```
public static ULocale getDefault()
```
Returns the current default ULocale.
The default ULocale is synchronized to the default Java Locale. This method checks the current default Java Locale and returns an equivalent ULocale.
Note: Before Java 7, the JDK Locale was not able to represent a locale's script. Therefore, the script field in the default ULocale is always empty unless a ULocale with non-empty script is explicitly set by setDefault(ULocale) on Java 6 or older systems.
Note for ICU 49 or later: Some JRE implementations allow users to override the default JDK Locale using system properties - user.language, user.country and user.variant. In addition to these system properties, some Java 7 implementations support user.script for overriding the default Locale's script. ICU 49 and later versions use the user.script system property on Java 6 or older systems supporting other user.* system properties to initialize the default ULocale. The user.script override for default ULocale is not used on Java 7, or if the current Java default Locale is changed after start up.

Returns:
the default ULocale.
Status:
Stable ICU 2.8.

setDefault
```
public static void setDefault(ULocale newLocale)
```
[icu] Sets the default ULocale. This also sets the default Locale. If the caller does not have write permission to the user.language property, a security exception will be thrown, and the default ULocale will remain unchanged.
By setting the default ULocale with this method, all of the default categoy locales are also set to the specified default ULocale.

Parameters:
newLocale - the new default locale

Throws:

SecurityException - if a security manager exists and its checkPermission method doesn't allow the operation.

NullPointerException - if newLocale is null
See Also:
SecurityManager.checkPermission(java.security.Permission), PropertyPermission, setDefault(Category, ULocale)
Status:
Stable ICU 3.0.

getDefault
```
public static ULocale getDefault(ULocale.Category category)
```
Returns the current default ULocale for the specified category.

Parameters:
category - the category

Returns:
the default ULocale for the specified category.
Status:
Stable ICU 49.

setDefault
```
public static void setDefault(ULocale.Category category,
              ULocale newLocale)
```
Sets the default ULocale for the specified Category. This also sets the default Locale for the specified Category of the JVM. If the caller does not have write permission to the user.language property, a security exception will be thrown, and the default ULocale for the specified Category will remain unchanged.

Parameters:
category - the specified category to set the default locale
newLocale - the new default locale
See Also:
SecurityManager.checkPermission(java.security.Permission), PropertyPermission
Status:
Stable ICU 49.

clone
```
public Object clone()
```
This is for compatibility with Locale-- in actuality, since ULocale is immutable, there is no reason to clone it, so this API returns 'this'.

Overrides:

clone in class Object

Status:
Stable ICU 3.0.

hashCode
```
public int hashCode()
```
Returns the hashCode.

Overrides:

hashCode in class Object

Status:
Stable ICU 3.0.

equals
```
public boolean equals(Object obj)
```
Returns true if the other object is another ULocale with the same full name. Note that since names are not canonicalized, two ULocales that function identically might not compare equal.

Overrides:

equals in class Object

Returns:
true if this Locale is equal to the specified object.
Status:
Stable ICU 3.0.

getAvailableLocales
```
public static ULocale[] getAvailableLocales()
```
[icu] Note: Unlike the Locale API, this returns an array of ULocale, not Locale. Returns a list of all installed locales.

Status:
Stable ICU 3.0.

getISOCountries
```
public static String[] getISOCountries()
```
Returns a list of all 2-letter country codes defined in ISO 3166. Can be used to create Locales.

Status:
Stable ICU 3.0.

getISOLanguages
```
public static String[] getISOLanguages()
```
Returns a list of all 2-letter language codes defined in ISO 639. Can be used to create Locales. [NOTE: ISO 639 is not a stable standard-- some languages' codes have changed. The list this function returns includes both the new and the old codes for the languages whose codes have changed.]

Status:
Stable ICU 3.0.

getLanguage
```
public String getLanguage()
```
Returns the language code for this locale, which will either be the empty string or a lowercase ISO 639 code.

See Also:
getDisplayLanguage(), getDisplayLanguage(ULocale)
Status:
Stable ICU 3.0.

getLanguage
```
public static String getLanguage(String localeID)
```
Returns the language code for the locale ID, which will either be the empty string or a lowercase ISO 639 code.

See Also:
getDisplayLanguage(), getDisplayLanguage(ULocale)
Status:
Stable ICU 3.0.

getScript
```
public String getScript()
```
[icu] Returns the script code for this locale, which might be the empty string.

See Also:
getDisplayScript(), getDisplayScript(ULocale)
Status:
Stable ICU 3.0.

getScript
```
public static String getScript(String localeID)
```
[icu] Returns the script code for the specified locale, which might be the empty string.

See Also:
getDisplayScript(), getDisplayScript(ULocale)
Status:
Stable ICU 3.0.

getCountry
```
public String getCountry()
```
Returns the country/region code for this locale, which will either be the empty string or an uppercase ISO 3166 2-letter code.

See Also:
getDisplayCountry(), getDisplayCountry(ULocale)
Status:
Stable ICU 3.0.

getCountry
```
public static String getCountry(String localeID)
```
Returns the country/region code for this locale, which will either be the empty string or an uppercase ISO 3166 2-letter code.

Parameters:
localeID - The locale identification string.
See Also:
getDisplayCountry(), getDisplayCountry(ULocale)
Status:
Stable ICU 3.0.

getVariant
```
public String getVariant()
```
Returns the variant code for this locale, which might be the empty string.

See Also:
getDisplayVariant(), getDisplayVariant(ULocale)
Status:
Stable ICU 3.0.

getVariant
```
public static String getVariant(String localeID)
```
Returns the variant code for the specified locale, which might be the empty string.

See Also:
getDisplayVariant(), getDisplayVariant(ULocale)
Status:
Stable ICU 3.0.

getFallback
```
public static String getFallback(String localeID)
```
[icu] Returns the fallback locale for the specified locale, which might be the empty string.

Status:
Stable ICU 3.2.

getFallback
```
public ULocale getFallback()
```
[icu] Returns the fallback locale for this locale. If this locale is root, returns null.

Status:
Stable ICU 3.2.

getBaseName
```
public String getBaseName()
```
[icu] Returns the (normalized) base name for this locale.

Returns:
the base name as a String.
Status:
Stable ICU 3.0.

getBaseName
```
public static String getBaseName(String localeID)
```
[icu] Returns the (normalized) base name for the specified locale.

Parameters:
localeID - the locale ID as a string

Returns:
the base name as a String.
Status:
Stable ICU 3.0.

getName
```
public String getName()
```
[icu] Returns the (normalized) full name for this locale.

Returns:
String the full name of the localeID
Status:
Stable ICU 3.0.

getName
```
public static String getName(String localeID)
```
[icu] Returns the (normalized) full name for the specified locale.

Parameters:
localeID - the localeID as a string

Returns:
String the full name of the localeID
Status:
Stable ICU 3.0.

toString
```
public String toString()
```
Returns a string representation of this object.

Overrides:

toString in class Object

Status:
Stable ICU 3.0.

getKeywords
```
public Iterator<String> getKeywords()
```
[icu] Returns an iterator over keywords for this locale. If there are no keywords, returns null.

Returns:
iterator over keywords, or null if there are no keywords.
Status:
Stable ICU 3.0.

getKeywords
```
public static Iterator<String> getKeywords(String localeID)
```
[icu] Returns an iterator over keywords for the specified locale. If there are no keywords, returns null.

Returns:
an iterator over the keywords in the specified locale, or null if there are no keywords.
Status:
Stable ICU 3.0.

getKeywordValue
```
public String getKeywordValue(String keywordName)
```
[icu] Returns the value for a keyword in this locale. If the keyword is not defined, returns null.

Parameters:
keywordName - name of the keyword whose value is desired. Case insensitive.

Returns:
the value of the keyword, or null.
Status:
Stable ICU 3.0.

getKeywordValue
```
public static String getKeywordValue(String localeID,
                     String keywordName)
```
[icu] Returns the value for a keyword in the specified locale. If the keyword is not defined, returns null. The locale name does not need to be normalized.

Parameters:
keywordName - name of the keyword whose value is desired. Case insensitive.

Returns:
String the value of the keyword as a string
Status:
Stable ICU 3.0.

canonicalize
```
public static String canonicalize(String localeID)
```
[icu] Returns the canonical name for the specified locale ID. This is used to convert POSIX and other grandfathered IDs to standard ICU form.

Parameters:
localeID - the locale id

Returns:
the canonicalized id
Status:
Stable ICU 3.0.

setKeywordValue
```
public ULocale setKeywordValue(String keyword,
                      String value)
```
Given a keyword and a value, return a new locale with an updated keyword and value. If keyword is null, this removes all keywords from the locale id. Otherwise, if the value is null, this removes the value for this keyword from the locale id. Otherwise, this adds/replaces the value for this keyword in the locale id. The keyword and value must not be empty.

Parameters:
keyword - the keyword to add/remove, or null to remove all keywords.
value - the value to add/set, or null to remove this particular keyword.

Returns:
the updated locale
Status:
Stable ICU 3.2.

setKeywordValue
```
public static String setKeywordValue(String localeID,
                     String keyword,
                     String value)
```
Given a locale id, a keyword, and a value, return a new locale id with an updated keyword and value. If keyword is null, this removes all keywords from the locale id. Otherwise, if the value is null, this removes the value for this keyword from the locale id. Otherwise, this adds/replaces the value for this keyword in the locale id. The keyword and value must not be empty.

Parameters:
localeID - the locale id to modify
keyword - the keyword to add/remove, or null to remove all keywords.
value - the value to add/set, or null to remove this particular keyword.

Returns:
the updated locale id
Status:
Stable ICU 3.2.

getISO3Language
```
public String getISO3Language()
```
Returns a three-letter abbreviation for this locale's language. If the locale doesn't specify a language, returns the empty string. Otherwise, returns a lowercase ISO 639-2/T language code. The ISO 639-2 language codes can be found on-line at ftp://dkuug.dk/i18n/iso-639-2.txt

Throws:

MissingResourceException - Throws MissingResourceException if the three-letter language abbreviation is not available for this locale.
Status:
Stable ICU 3.0.

getISO3Language
```
public static String getISO3Language(String localeID)
```
Returns a three-letter abbreviation for this locale's language. If the locale doesn't specify a language, returns the empty string. Otherwise, returns a lowercase ISO 639-2/T language code. The ISO 639-2 language codes can be found on-line at ftp://dkuug.dk/i18n/iso-639-2.txt

Throws:

MissingResourceException - Throws MissingResourceException if the three-letter language abbreviation is not available for this locale.
Status:
Stable ICU 3.0.

getISO3Country
```
public String getISO3Country()
```
Returns a three-letter abbreviation for this locale's country/region. If the locale doesn't specify a country, returns the empty string. Otherwise, returns an uppercase ISO 3166 3-letter country code.

Throws:

MissingResourceException - Throws MissingResourceException if the three-letter country abbreviation is not available for this locale.
Status:
Stable ICU 3.0.

getISO3Country
```
public static String getISO3Country(String localeID)
```
Returns a three-letter abbreviation for this locale's country/region. If the locale doesn't specify a country, returns the empty string. Otherwise, returns an uppercase ISO 3166 3-letter country code.

Throws:

MissingResourceException - Throws MissingResourceException if the three-letter country abbreviation is not available for this locale.
Status:
Stable ICU 3.0.

getDisplayLanguage
```
public String getDisplayLanguage()
```
Returns this locale's language localized for display in the default DISPLAY locale.

Returns:
the localized language name.
See Also:
ULocale.Category.DISPLAY
Status:
Stable ICU 3.0.

getDisplayLanguage
```
public String getDisplayLanguage(ULocale displayLocale)
```
[icu] Returns this locale's language localized for display in the provided locale.

Parameters:
displayLocale - the locale in which to display the name.

Returns:
the localized language name.
Status:
Stable ICU 3.0.

getDisplayLanguage
```
public static String getDisplayLanguage(String localeID,
                        String displayLocaleID)
```
Returns a locale's language localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters:
localeID - the id of the locale whose language will be displayed
displayLocaleID - the id of the locale in which to display the name.

Returns:
the localized language name.
Status:
Stable ICU 3.0.

getDisplayLanguage
```
public static String getDisplayLanguage(String localeID,
                        ULocale displayLocale)
```
Returns a locale's language localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters:
localeID - the id of the locale whose language will be displayed.
displayLocale - the locale in which to display the name.

Returns:
the localized language name.
Status:
Stable ICU 3.0.

getDisplayLanguageWithDialect
```
public String getDisplayLanguageWithDialect()
```
[icu] Returns this locale's language localized for display in the default DISPLAY locale. If a dialect name is present in the data, then it is returned.

Returns:
the localized language name.
See Also:
ULocale.Category.DISPLAY
Status:
Stable ICU 4.4.

getDisplayLanguageWithDialect
```
public String getDisplayLanguageWithDialect(ULocale displayLocale)
```
[icu] Returns this locale's language localized for display in the provided locale. If a dialect name is present in the data, then it is returned.

Parameters:
displayLocale - the locale in which to display the name.

Returns:
the localized language name.
Status:
Stable ICU 4.4.

getDisplayLanguageWithDialect
```
public static String getDisplayLanguageWithDialect(String localeID,
                                   String displayLocaleID)
```
[icu] Returns a locale's language localized for display in the provided locale. If a dialect name is present in the data, then it is returned. This is a cover for the ICU4C API.

Parameters:
localeID - the id of the locale whose language will be displayed
displayLocaleID - the id of the locale in which to display the name.

Returns:
the localized language name.
Status:
Stable ICU 4.4.

getDisplayLanguageWithDialect
```
public static String getDisplayLanguageWithDialect(String localeID,
                                   ULocale displayLocale)
```
[icu] Returns a locale's language localized for display in the provided locale. If a dialect name is present in the data, then it is returned. This is a cover for the ICU4C API.

Parameters:
localeID - the id of the locale whose language will be displayed.
displayLocale - the locale in which to display the name.

Returns:
the localized language name.
Status:
Stable ICU 4.4.

getDisplayScript
```
public String getDisplayScript()
```
[icu] Returns this locale's script localized for display in the default DISPLAY locale.

Returns:
the localized script name.
See Also:
ULocale.Category.DISPLAY
Status:
Stable ICU 3.0.

getDisplayScriptInContext
```
public String getDisplayScriptInContext()
```
Deprecated. This API is ICU internal only.

[icu] Returns this locale's script localized for display in the default DISPLAY locale.

Returns:
the localized script name.
See Also:
ULocale.Category.DISPLAY
Status:
Internal. This API is ICU internal only.

getDisplayScript
```
public String getDisplayScript(ULocale displayLocale)
```
[icu] Returns this locale's script localized for display in the provided locale.

Parameters:
displayLocale - the locale in which to display the name.

Returns:
the localized script name.
Status:
Stable ICU 3.0.

getDisplayScriptInContext
```
public String getDisplayScriptInContext(ULocale displayLocale)
```
Deprecated. This API is ICU internal only.

[icu] Returns this locale's script localized for display in the provided locale.

Parameters:
displayLocale - the locale in which to display the name.

Returns:
the localized script name.
Status:
Internal. This API is ICU internal only.

getDisplayScript
```
public static String getDisplayScript(String localeID,
                      String displayLocaleID)
```
[icu] Returns a locale's script localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters:
localeID - the id of the locale whose script will be displayed
displayLocaleID - the id of the locale in which to display the name.

Returns:
the localized script name.
Status:
Stable ICU 3.0.

getDisplayScriptInContext
```
public static String getDisplayScriptInContext(String localeID,
                               String displayLocaleID)
```
Deprecated. This API is ICU internal only.

[icu] Returns a locale's script localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters:
localeID - the id of the locale whose script will be displayed
displayLocaleID - the id of the locale in which to display the name.

Returns:
the localized script name.
Status:
Internal. This API is ICU internal only.

getDisplayScript
```
public static String getDisplayScript(String localeID,
                      ULocale displayLocale)
```
[icu] Returns a locale's script localized for display in the provided locale.

Parameters:
localeID - the id of the locale whose script will be displayed.
displayLocale - the locale in which to display the name.

Returns:
the localized script name.
Status:
Stable ICU 3.0.

getDisplayScriptInContext
```
public static String getDisplayScriptInContext(String localeID,
                               ULocale displayLocale)
```
Deprecated. This API is ICU internal only.

[icu] Returns a locale's script localized for display in the provided locale.

Parameters:
localeID - the id of the locale whose script will be displayed.
displayLocale - the locale in which to display the name.

Returns:
the localized script name.
Status:
Internal. This API is ICU internal only.

getDisplayCountry
```
public String getDisplayCountry()
```
Returns this locale's country localized for display in the default DISPLAY locale.

Returns:
the localized country name.
See Also:
ULocale.Category.DISPLAY
Status:
Stable ICU 3.0.

getDisplayCountry
```
public String getDisplayCountry(ULocale displayLocale)
```
Returns this locale's country localized for display in the provided locale.

Parameters:
displayLocale - the locale in which to display the name.

Returns:
the localized country name.
Status:
Stable ICU 3.0.

getDisplayCountry
```
public static String getDisplayCountry(String localeID,
                       String displayLocaleID)
```
Returns a locale's country localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters:
localeID - the id of the locale whose country will be displayed
displayLocaleID - the id of the locale in which to display the name.

Returns:
the localized country name.
Status:
Stable ICU 3.0.

getDisplayCountry
```
public static String getDisplayCountry(String localeID,
                       ULocale displayLocale)
```
Returns a locale's country localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters:
localeID - the id of the locale whose country will be displayed.
displayLocale - the locale in which to display the name.

Returns:
the localized country name.
Status:
Stable ICU 3.0.

getDisplayVariant
```
public String getDisplayVariant()
```
Returns this locale's variant localized for display in the default DISPLAY locale.

Returns:
the localized variant name.
See Also:
ULocale.Category.DISPLAY
Status:
Stable ICU 3.0.

getDisplayVariant
```
public String getDisplayVariant(ULocale displayLocale)
```
Returns this locale's variant localized for display in the provided locale.

Parameters:
displayLocale - the locale in which to display the name.

Returns:
the localized variant name.
Status:
Stable ICU 3.0.

getDisplayVariant
```
public static String getDisplayVariant(String localeID,
                       String displayLocaleID)
```
Returns a locale's variant localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters:
localeID - the id of the locale whose variant will be displayed
displayLocaleID - the id of the locale in which to display the name.

Returns:
the localized variant name.
Status:
Stable ICU 3.0.

getDisplayVariant
```
public static String getDisplayVariant(String localeID,
                       ULocale displayLocale)
```
Returns a locale's variant localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters:
localeID - the id of the locale whose variant will be displayed.
displayLocale - the locale in which to display the name.

Returns:
the localized variant name.
Status:
Stable ICU 3.0.

getDisplayKeyword
```
public static String getDisplayKeyword(String keyword)
```
[icu] Returns a keyword localized for display in the default DISPLAY locale.

Parameters:
keyword - the keyword to be displayed.

Returns:
the localized keyword name.
See Also:
getKeywords(), ULocale.Category.DISPLAY
Status:
Stable ICU 3.0.

getDisplayKeyword
```
public static String getDisplayKeyword(String keyword,
                       String displayLocaleID)
```
[icu] Returns a keyword localized for display in the specified locale.

Parameters:
keyword - the keyword to be displayed.
displayLocaleID - the id of the locale in which to display the keyword.

Returns:
the localized keyword name.
See Also:
getKeywords(String)
Status:
Stable ICU 3.0.

getDisplayKeyword
```
public static String getDisplayKeyword(String keyword,
                       ULocale displayLocale)
```
[icu] Returns a keyword localized for display in the specified locale.

Parameters:
keyword - the keyword to be displayed.
displayLocale - the locale in which to display the keyword.

Returns:
the localized keyword name.
See Also:
getKeywords(String)
Status:
Stable ICU 3.0.

getDisplayKeywordValue
```
public String getDisplayKeywordValue(String keyword)
```
[icu] Returns a keyword value localized for display in the default DISPLAY locale.

Parameters:
keyword - the keyword whose value is to be displayed.

Returns:
the localized value name.
See Also:
ULocale.Category.DISPLAY
Status:
Stable ICU 3.0.

getDisplayKeywordValue
```
public String getDisplayKeywordValue(String keyword,
                            ULocale displayLocale)
```
[icu] Returns a keyword value localized for display in the specified locale.

Parameters:
keyword - the keyword whose value is to be displayed.
displayLocale - the locale in which to display the value.

Returns:
the localized value name.
Status:
Stable ICU 3.0.

getDisplayKeywordValue
```
public static String getDisplayKeywordValue(String localeID,
                            String keyword,
                            String displayLocaleID)
```
[icu] Returns a keyword value localized for display in the specified locale. This is a cover for the ICU4C API.

Parameters:
localeID - the id of the locale whose keyword value is to be displayed.
keyword - the keyword whose value is to be displayed.
displayLocaleID - the id of the locale in which to display the value.

Returns:
the localized value name.
Status:
Stable ICU 3.0.

getDisplayKeywordValue
```
public static String getDisplayKeywordValue(String localeID,
                            String keyword,
                            ULocale displayLocale)
```
[icu] Returns a keyword value localized for display in the specified locale. This is a cover for the ICU4C API.

Parameters:
localeID - the id of the locale whose keyword value is to be displayed.
keyword - the keyword whose value is to be displayed.
displayLocale - the id of the locale in which to display the value.

Returns:
the localized value name.
Status:
Stable ICU 3.0.

getDisplayName
```
public String getDisplayName()
```
Returns this locale name localized for display in the default DISPLAY locale.

Returns:
the localized locale name.
See Also:
ULocale.Category.DISPLAY
Status:
Stable ICU 3.0.

getDisplayName
```
public String getDisplayName(ULocale displayLocale)
```
Returns this locale name localized for display in the provided locale.

Parameters:
displayLocale - the locale in which to display the locale name.

Returns:
the localized locale name.
Status:
Stable ICU 3.0.

getDisplayName
```
public static String getDisplayName(String localeID,
                    String displayLocaleID)
```
Returns the locale ID localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters:
localeID - the locale whose name is to be displayed.
displayLocaleID - the id of the locale in which to display the locale name.

Returns:
the localized locale name.
Status:
Stable ICU 3.0.

getDisplayName
```
public static String getDisplayName(String localeID,
                    ULocale displayLocale)
```
Returns the locale ID localized for display in the provided locale. This is a cover for the ICU4C API.

Parameters:
localeID - the locale whose name is to be displayed.
displayLocale - the locale in which to display the locale name.

Returns:
the localized locale name.
Status:
Stable ICU 3.0.

getDisplayNameWithDialect
```
public String getDisplayNameWithDialect()
```
[icu] Returns this locale name localized for display in the default DISPLAY locale. If a dialect name is present in the locale data, then it is returned.

Returns:
the localized locale name.
See Also:
ULocale.Category.DISPLAY
Status:
Stable ICU 4.4.

getDisplayNameWithDialect
```
public String getDisplayNameWithDialect(ULocale displayLocale)
```
[icu] Returns this locale name localized for display in the provided locale. If a dialect name is present in the locale data, then it is returned.

Parameters:
displayLocale - the locale in which to display the locale name.

Returns:
the localized locale name.
Status:
Stable ICU 4.4.

getDisplayNameWithDialect
```
public static String getDisplayNameWithDialect(String localeID,
                               String displayLocaleID)
```
[icu] Returns the locale ID localized for display in the provided locale. If a dialect name is present in the locale data, then it is returned. This is a cover for the ICU4C API.

Parameters:
localeID - the locale whose name is to be displayed.
displayLocaleID - the id of the locale in which to display the locale name.

Returns:
the localized locale name.
Status:
Stable ICU 4.4.

getDisplayNameWithDialect
```
public static String getDisplayNameWithDialect(String localeID,
                               ULocale displayLocale)
```
[icu] Returns the locale ID localized for display in the provided locale. If a dialect name is present in the locale data, then it is returned. This is a cover for the ICU4C API.

Parameters:
localeID - the locale whose name is to be displayed.
displayLocale - the locale in which to display the locale name.

Returns:
the localized locale name.
Status:
Stable ICU 4.4.

getCharacterOrientation
```
public String getCharacterOrientation()
```
[icu] Returns this locale's layout orientation for characters. The possible values are "left-to-right", "right-to-left", "top-to-bottom" or "bottom-to-top".

Returns:
The locale's layout orientation for characters.
Status:
Stable ICU 4.0.

getLineOrientation
```
public String getLineOrientation()
```
[icu] Returns this locale's layout orientation for lines. The possible values are "left-to-right", "right-to-left", "top-to-bottom" or "bottom-to-top".

Returns:
The locale's layout orientation for lines.
Status:
Stable ICU 4.0.

acceptLanguage
```
public static ULocale acceptLanguage(String acceptLanguageList,
                     ULocale[] availableLocales,
                     boolean[] fallback)
```
[icu] Based on a HTTP formatted list of acceptable locales, determine an available locale for the user. NullPointerException is thrown if acceptLanguageList or availableLocales is null. If fallback is non-null, it will contain true if a fallback locale (one not in the acceptLanguageList) was returned. The value on entry is ignored. ULocale will be one of the locales in availableLocales, or the ROOT ULocale if if a ROOT locale was used as a fallback (because nothing else in availableLocales matched). No ULocale array element should be null; behavior is undefined if this is the case.

Parameters:
acceptLanguageList - list in HTTP "Accept-Language:" format of acceptable locales
availableLocales - list of available locales. One of these will be returned.
fallback - if non-null, a 1-element array containing a boolean to be set with the fallback status

Returns:
one of the locales from the availableLocales list, or null if none match
Status:
Stable ICU 3.4.

acceptLanguage
```
public static ULocale acceptLanguage(ULocale[] acceptLanguageList,
                     ULocale[] availableLocales,
                     boolean[] fallback)
```
[icu] Based on a list of acceptable locales, determine an available locale for the user. NullPointerException is thrown if acceptLanguageList or availableLocales is null. If fallback is non-null, it will contain true if a fallback locale (one not in the acceptLanguageList) was returned. The value on entry is ignored. ULocale will be one of the locales in availableLocales, or the ROOT ULocale if if a ROOT locale was used as a fallback (because nothing else in availableLocales matched). No ULocale array element should be null; behavior is undefined if this is the case.

Parameters:
acceptLanguageList - list of acceptable locales
availableLocales - list of available locales. One of these will be returned.
fallback - if non-null, a 1-element array containing a boolean to be set with the fallback status

Returns:
one of the locales from the availableLocales list, or null if none match
Status:
Stable ICU 3.4.

acceptLanguage
```
public static ULocale acceptLanguage(String acceptLanguageList,
                     boolean[] fallback)
```
[icu] Based on a HTTP formatted list of acceptable locales, determine an available locale for the user. NullPointerException is thrown if acceptLanguageList or availableLocales is null. If fallback is non-null, it will contain true if a fallback locale (one not in the acceptLanguageList) was returned. The value on entry is ignored. ULocale will be one of the locales in availableLocales, or the ROOT ULocale if if a ROOT locale was used as a fallback (because nothing else in availableLocales matched). No ULocale array element should be null; behavior is undefined if this is the case. This function will choose a locale from the ULocale.getAvailableLocales() list as available.

Parameters:
acceptLanguageList - list in HTTP "Accept-Language:" format of acceptable locales
fallback - if non-null, a 1-element array containing a boolean to be set with the fallback status

Returns:
one of the locales from the ULocale.getAvailableLocales() list, or null if none match
Status:
Stable ICU 3.4.

acceptLanguage
```
public static ULocale acceptLanguage(ULocale[] acceptLanguageList,
                     boolean[] fallback)
```
[icu] Based on an ordered array of acceptable locales, determine an available locale for the user. NullPointerException is thrown if acceptLanguageList or availableLocales is null. If fallback is non-null, it will contain true if a fallback locale (one not in the acceptLanguageList) was returned. The value on entry is ignored. ULocale will be one of the locales in availableLocales, or the ROOT ULocale if if a ROOT locale was used as a fallback (because nothing else in availableLocales matched). No ULocale array element should be null; behavior is undefined if this is the case. This function will choose a locale from the ULocale.getAvailableLocales() list as available.

Parameters:
acceptLanguageList - ordered array of acceptable locales (preferred are listed first)
fallback - if non-null, a 1-element array containing a boolean to be set with the fallback status

Returns:
one of the locales from the ULocale.getAvailableLocales() list, or null if none match
Status:
Stable ICU 3.4.

addLikelySubtags
```
public static ULocale addLikelySubtags(ULocale loc)
```
[icu] Adds the likely subtags for a provided locale ID, per the algorithm described in the following CLDR technical report: http://www.unicode.org/reports/tr35/#Likely_Subtags If the provided ULocale instance is already in the maximal form, or there is no data available available for maximization, it will be returned. For example, "und-Zzzz" cannot be maximized, since there is no reasonable maximization. Otherwise, a new ULocale instance with the maximal form is returned. Examples: "en" maximizes to "en_Latn_US" "de" maximizes to "de_Latn_US" "sr" maximizes to "sr_Cyrl_RS" "sh" maximizes to "sr_Latn_RS" (Note this will not reverse.) "zh_Hani" maximizes to "zh_Hans_CN" (Note this will not reverse.)

Parameters:
loc - The ULocale to maximize

Returns:
The maximized ULocale instance.
Status:
Stable ICU 4.0.

minimizeSubtags
```
public static ULocale minimizeSubtags(ULocale loc)
```
[icu] Minimizes the subtags for a provided locale ID, per the algorithm described in the following CLDR technical report:
http://www.unicode.org/reports/tr35/#Likely_Subtags
If the provided ULocale instance is already in the minimal form, or there is no data available for minimization, it will be returned. Since the minimization algorithm relies on proper maximization, see the comments for addLikelySubtags for reasons why there might not be any data. Examples:
```
 "en_Latn_US" minimizes to "en"

 "de_Latn_US" minimizes to "de"

 "sr_Cyrl_RS" minimizes to "sr"

 "zh_Hant_TW" minimizes to "zh_TW" (The region is preferred to the
 script, and minimizing to "zh" would imply "zh_Hans_CN".) 
```
Parameters:
loc - The ULocale to minimize

Returns:
The minimized ULocale instance.
Status:
Stable ICU 4.0.

getExtension
```
public String getExtension(char key)
```
[icu] Returns the extension (or private use) value associated with the specified key, or null if there is no extension associated with the key. To be well-formed, the key must be one of [0-9A-Za-z]. Keys are case-insensitive, so for example 'z' and 'Z' represent the same extension.

Parameters:
key - the extension key

Returns:
The extension, or null if this locale defines no extension for the specified key.

Throws:

IllegalArgumentException - if key is not well-formed
See Also:
PRIVATE_USE_EXTENSION, UNICODE_LOCALE_EXTENSION
Status:
Stable ICU 4.2.

getExtensionKeys
```
public Set<Character> getExtensionKeys()
```
[icu] Returns the set of extension keys associated with this locale, or the empty set if it has no extensions. The returned set is unmodifiable. The keys will all be lower-case.

Returns:
the set of extension keys, or the empty set if this locale has no extensions
Status:
Stable ICU 4.2.

getUnicodeLocaleAttributes
```
public Set<String> getUnicodeLocaleAttributes()
```
[icu] Returns the set of unicode locale attributes associated with this locale, or the empty set if it has no attributes. The returned set is unmodifiable.

Returns:
The set of attributes.
Status:
Stable ICU 4.6.

getUnicodeLocaleType
```
public String getUnicodeLocaleType(String key)
```
[icu] Returns the Unicode locale type associated with the specified Unicode locale key for this locale. Returns the empty string for keys that are defined with no type. Returns null if the key is not defined. Keys are case-insensitive. The key must be two alphanumeric characters ([0-9a-zA-Z]), or an IllegalArgumentException is thrown.

Parameters:
key - the Unicode locale key

Returns:
The Unicode locale type associated with the key, or null if the locale does not define the key.

Throws:

IllegalArgumentException - if the key is not well-formed

NullPointerException - if key is null
Status:
Stable ICU 4.4.

getUnicodeLocaleKeys
```
public Set<String> getUnicodeLocaleKeys()
```
[icu] Returns the set of Unicode locale keys defined by this locale, or the empty set if this locale has none. The returned set is immutable. Keys are all lower case.

Returns:
The set of Unicode locale keys, or the empty set if this locale has no Unicode locale keywords.
Status:
Stable ICU 4.4.

toLanguageTag
```
public String toLanguageTag()
```
[icu] Returns a well-formed IETF BCP 47 language tag representing this locale.
If this ULocale has a language, script, country, or variant that does not satisfy the IETF BCP 47 language tag syntax requirements, this method handles these fields as described below:
Language: If language is empty, or not well-formed (for example "a" or "e2"), it will be emitted as "und" (Undetermined).
Script: If script is not well-formed (for example "12" or "Latin"), it will be omitted.
Country: If country is not well-formed (for example "12" or "USA"), it will be omitted.
Variant: If variant is well-formed, each sub-segment (delimited by '-' or '_') is emitted as a subtag. Otherwise:
- if all sub-segments match [0-9a-zA-Z]{1,8} (for example "WIN" or "Oracle_JDK_Standard_Edition"), the first ill-formed sub-segment and all following will be appended to the private use subtag. The first appended subtag will be "lvariant", followed by the sub-segments in order, separated by hyphen. For example, "x-lvariant-WIN", "Oracle-x-lvariant-JDK-Standard-Edition".
- if any sub-segment does not match [0-9a-zA-Z]{1,8}, the variant will be truncated and the problematic sub-segment and all following sub-segments will be omitted. If the remainder is non-empty, it will be emitted as a private use subtag as above (even if the remainder turns out to be well-formed). For example, "Solaris_isjustthecoolestthing" is emitted as "x-lvariant-Solaris", not as "solaris".
Note: Although the language tag created by this method is well-formed (satisfies the syntax requirements defined by the IETF BCP 47 specification), it is not necessarily a valid BCP 47 language tag. For example,
```
   new Locale("xx", "YY").toLanguageTag();
```
will return "xx-YY", but the language subtag "xx" and the region subtag "YY" are invalid because they are not registered in the IANA Language Subtag Registry.
Returns:
a BCP47 language tag representing the locale
See Also:
forLanguageTag(String)
Status:
Stable ICU 4.2.

forLanguageTag

public static ULocale forLanguageTag(String languageTag)

[icu] Returns a locale for the specified IETF BCP 47 language tag string.

If the specified language tag contains any ill-formed subtags, the first such subtag and all following subtags are ignored. Compare to ULocale.Builder.setLanguageTag(java.lang.String) which throws an exception in this case.

The following conversions are performed:

The language code "und" is mapped to language "".

The portion of a private use subtag prefixed by "lvariant", if any, is removed and appended to the variant field in the result locale (without case normalization). If it is then empty, the private use subtag is discarded:

     ULocale loc;
     loc = ULocale.forLanguageTag("en-US-x-lvariant-icu4j);
     loc.getVariant(); // returns "ICU4J"
     loc.getExtension('x'); // returns null

     loc = Locale.forLanguageTag("de-icu4j-x-URP-lvariant-Abc-Def");
     loc.getVariant(); // returns "ICU4J_ABC_DEF"
     loc.getExtension('x'); // returns "urp"

When the languageTag argument contains an extlang subtag, the first such subtag is used as the language, and the primary language subtag and other extlang subtags are ignored:
```
     ULocale.forLanguageTag("ar-aao").getLanguage(); // returns "aao"
     ULocale.forLanguageTag("en-abc-def-us").toString(); // returns "abc_US"
 
```

Case is normalized. Language is normalized to lower case, script to title case, country to upper case, variant to upper case, and extensions to lower case.

This implements the 'Language-Tag' production of BCP47, and so supports grandfathered (regular and irregular) as well as private use language tags. Stand alone private use tags are represented as empty language and extension 'x-whatever', and grandfathered tags are converted to their canonical replacements where they exist.

Grandfathered tags with canonical replacements are as follows:

grandfathered tag		modern replacement
art-lojban		jbo
i-ami		ami
i-bnn		bnn
i-hak		hak
i-klingon		tlh
i-lux		lb
i-navajo		nv
i-pwn		pwn
i-tao		tao
i-tay		tay
i-tsu		tsu
no-bok		nb
no-nyn		nn
sgn-BE-FR		sfb
sgn-BE-NL		vgt
sgn-CH-DE		sgg
zh-guoyu		cmn
zh-hakka		hak
zh-min-nan		nan
zh-xiang		hsn

Grandfathered tags with no modern replacement will be converted as follows:

grandfathered tag		converts to
cel-gaulish		xtg-x-cel-gaulish
en-GB-oed		en-GB-x-oed
i-default		en-x-i-default
i-enochian		und-x-i-enochian
i-mingo		see-x-i-mingo
zh-min		nan-x-zh-min

For a list of all grandfathered tags, see the IANA Language Subtag Registry (search for "Type: grandfathered").

Note: there is no guarantee that toLanguageTag and forLanguageTag will round-trip.

Parameters:: languageTag - the language tag
Returns:: The locale that best represents the language tag.
Throws:: NullPointerException - if languageTag is null
See Also:: toLanguageTag(), ULocale.Builder.setLanguageTag(String)
Status:: Stable ICU 4.2.

Class ULocale

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

ENGLISH

FRENCH

GERMAN

ITALIAN

JAPANESE

KOREAN

CHINESE

SIMPLIFIED_CHINESE

TRADITIONAL_CHINESE

FRANCE

GERMANY

ITALY

JAPAN

KOREA

CHINA

PRC

TAIWAN

UK

US

CANADA

CANADA_FRENCH

ROOT

ACTUAL_LOCALE

VALID_LOCALE

PRIVATE_USE_EXTENSION

UNICODE_LOCALE_EXTENSION

Constructor Detail

ULocale

ULocale

ULocale

Method Detail

forLocale

createCanonical

toLocale

getDefault

setDefault

getDefault

setDefault

clone

hashCode

equals

getAvailableLocales

getISOCountries

getISOLanguages

getLanguage

getLanguage

getScript

getScript

getCountry

getCountry

getVariant

getVariant

getFallback

getFallback

getBaseName

getBaseName

getName

getName

toString

getKeywords

getKeywords

getKeywordValue

getKeywordValue

canonicalize

setKeywordValue

setKeywordValue

getISO3Language

getISO3Language

getISO3Country

getISO3Country

getDisplayLanguage

getDisplayLanguage

getDisplayLanguage