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# ULocale

`public final class ULocale`
`extends Object` `implements Serializable, Comparable<ULocale>`

java.lang.Object
↳ | android.icu.util.ULocale

[icu enhancement] ICU's replacement for `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
- Legacy language tags (marked as “Type: grandfathered” in BCP 47) are converted to ICU standard form

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.

Note: The actual locale is returned correctly, but the valid locale is not, in most cases.

See also:

- `Locale`

## Summary

### Nested classes
`enum` | `ULocale.AvailableType` Types for `ULocale#getAvailableLocalesByType`
`class` | `ULocale.Builder` `Builder` is used to build instances of `ULocale` from values configured by the setters.
`enum` | `ULocale.Category` Enum for locale categories.

### Constants
`char` | `PRIVATE_USE_EXTENSION` The key for the private use locale extension ('x').
`char` | `UNICODE_LOCALE_EXTENSION` The key for Unicode locale extension ('u').

### Fields
`public static final ULocale` | `CANADA` Useful constant for country/region.
`public static final ULocale` | `CANADA_FRENCH` Useful constant for country/region.
`public static final ULocale` | `CHINA` Useful constant for country/region.
`public static final ULocale` | `CHINESE` Useful constant for language.
`public static final ULocale` | `ENGLISH` Useful constant for language.
`public static final ULocale` | `FRANCE` Useful constant for country/region.
`public static final ULocale` | `FRENCH` Useful constant for language.
`public static final ULocale` | `GERMAN` Useful constant for language.
`public static final ULocale` | `GERMANY` Useful constant for country/region.
`public static final ULocale` | `ITALIAN` Useful constant for language.
`public static final ULocale` | `ITALY` Useful constant for country/region.
`public static final ULocale` | `JAPAN` Useful constant for country/region.
`public static final ULocale` | `JAPANESE` Useful constant for language.
`public static final ULocale` | `KOREA` Useful constant for country/region.
`public static final ULocale` | `KOREAN` Useful constant for language.
`public static final ULocale` | `PRC` Useful constant for country/region.
`public static final ULocale` | `ROOT` The root ULocale.
`public static final ULocale` | `SIMPLIFIED_CHINESE` Useful constant for language.
`public static final ULocale` | `TAIWAN` Useful constant for country/region.
`public static final ULocale` | `TRADITIONAL_CHINESE` Useful constant for language.
`public static final ULocale` | `UK` Useful constant for country/region.
`public static final ULocale` | `US` Useful constant for country/region.

### Public constructors
`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.

### Public methods
`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(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, ULocale[] availableLocales, boolean[] fallback)` [icu] Based on a list of acceptable locales, determine an available locale for the user.
`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` | `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 according to CLDR 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'.
`int` | `compareTo(ULocale other)` Compares two ULocale for ordering.
`static ULocale` | `createCanonical(String nonCanonicalID)` [icu] Creates a ULocale from the id by first canonicalizing the id according to CLDR.
`boolean` | `equals(Object obj)` Returns true if the other object is another ULocale with the same full name.
`static ULocale` | `forLanguageTag(String languageTag)` 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`.
`static Collection<ULocale>` | `getAvailableLocalesByType(ULocale.AvailableType type)` Returns a list of all installed locales according to the specified type.
`String` | `getBaseName()` [icu] Returns the (normalized) base name for this locale, like `getName()`, but without keywords.
`static String` | `getBaseName(String localeID)` [icu] Returns the (normalized) base name for the specified locale, like `getName(java.lang.String)`, but without keywords.
`String` | `getCharacterOrientation()` [icu] Returns this locale's layout orientation for characters.
`static String` | `getCountry(String localeID)` [icu] Returns the country/region code for this locale, which will either be the empty string or an uppercase ISO 3166 2-letter code.
`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 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)` [icu] 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` | `getDisplayCountry(String localeID, ULocale displayLocale)` [icu] Returns a locale's country localized for display in the provided locale.
`static String` | `getDisplayKeyword(String keyword, ULocale displayLocale)` [icu] Returns a keyword localized for display in the specified locale.
`static String` | `getDisplayKeyword(String keyword, String displayLocaleID)` [icu] Returns a keyword localized for display in the specified locale.
`static String` | `getDisplayKeyword(String keyword)` [icu] Returns a keyword 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)` [icu] Returns a keyword value localized for display in the default `DISPLAY` locale.
`String` | `getDisplayKeywordValue(String keyword, ULocale displayLocale)` [icu] Returns a keyword value localized for display in the specified locale.
`String` | `getDisplayLanguage(ULocale displayLocale)` Returns this locale's language localized for display in the provided locale.
`static String` | `getDisplayLanguage(String localeID, ULocale displayLocale)` [icu] Returns a locale's language localized for display in the provided locale.
`static String` | `getDisplayLanguage(String localeID, String displayLocaleID)` [icu] Returns a locale's language localized for display in the provided locale.
`String` | `getDisplayLanguage()` Returns this locale's language localized for display in the default `DISPLAY` locale.
`String` | `getDisplayLanguageWithDialect(ULocale displayLocale)` [icu] Returns this locale's language localized for display in the provided 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()` [icu] Returns this locale's language localized for display in the default `DISPLAY` locale.
`String` | `getDisplayName()` Returns this locale name localized for display in the default `DISPLAY` locale.
`String` | `getDisplayName(ULocale displayLocale)` Returns this locale name localized for display in the provided locale.
`static String` | `getDisplayName(String localeID, String displayLocaleID)` [icu] Returns the locale ID localized for display in the provided locale.
`static String` | `getDisplayName(String localeID, ULocale displayLocale)` [icu] Returns the locale ID localized for display in the provided 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` | `getDisplayNameWithDialect()` [icu] Returns this locale name 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()` Returns this locale's script localized for display in the default `DISPLAY` locale.
`String` | `getDisplayScript(ULocale displayLocale)` Returns this locale's script localized for display in the provided locale.
`static String` | `getDisplayVariant(String localeID, String displayLocaleID)` [icu] Returns a locale's variant localized for display in the provided locale.
`String` | `getDisplayVariant()` Returns this locale's variant localized for display in the default `DISPLAY` locale.
`String` | `getDisplayVariant(ULocale displayLocale)` Returns this locale's variant localized for display in the provided locale.
`static String` | `getDisplayVariant(String localeID, ULocale displayLocale)` [icu] Returns a locale's variant localized for display in the provided locale.
`String` | `getExtension(char key)` 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()` 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)` [icu] 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)` [icu] 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.
`static String` | `getKeywordValue(String localeID, String keywordName)` [icu] Returns the value for a keyword in the specified locale.
`String` | `getKeywordValue(String keywordName)` [icu] Returns the value for a keyword in this locale.
`static Iterator<String>` | `getKeywords(String localeID)` [icu] Returns an iterator over keywords for the specified locale.
`Iterator<String>` | `getKeywords()` [icu] Returns an iterator over keywords for this locale.
`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` | `getLanguage()` Returns the language code for this locale, 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()` 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()` Returns the set of unicode locale attributes associated with this locale, or the empty set if it has no attributes.
`Set<String>` | `getUnicodeLocaleKeys()` Returns the set of Unicode locale keys defined by this locale, or the empty set if this locale has none.
`String` | `getUnicodeLocaleType(String key)` 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)` [icu] Returns the variant code for the specified locale, which might be the empty string.
`int` | `hashCode()` Returns the hashCode.
`boolean` | `isRightToLeft()` [icu] Returns whether this locale's script is written right-to-left.
`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.
`ULocale` | `setKeywordValue(String keyword, String value)` [icu] 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()` Returns a well-formed IETF BCP 47 language tag representing this locale.
`static String` | `toLegacyKey(String keyword)` [icu] Converts the specified keyword (BCP 47 Unicode locale extension key, or legacy key) to the legacy key.
`static String` | `toLegacyType(String keyword, String value)` [icu] Converts the specified keyword value (BCP 47 Unicode locale extension type, or legacy type or type alias) to the canonical legacy type.
`Locale` | `toLocale()` [icu] Converts this ULocale object to a `Locale`.
`String` | `toString()` Returns a string representation of this object.
`static String` | `toUnicodeLocaleKey(String keyword)` [icu] Converts the specified keyword (legacy key, or BCP 47 Unicode locale extension key) to the equivalent BCP 47 Unicode locale extension key.
`static String` | `toUnicodeLocaleType(String keyword, String value)` [icu] Converts the specified keyword value (legacy type, or BCP 47 Unicode locale extension type) to the well-formed BCP 47 Unicode locale extension type for the specified keyword (category).

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `java.lang.Comparable`
`abstract int` | `compareTo(ULocale o)` Compares this object with the specified object for order.

## Constants

### PRIVATE_USE_EXTENSION

    public static final char PRIVATE_USE_EXTENSION

The key for the private use locale extension ('x').

See also:

- `getExtension(char)`
- `ULocale.Builder.setExtension(char, String)`

Constant Value: 120 (0x00000078)

### UNICODE_LOCALE_EXTENSION

    public static final char UNICODE_LOCALE_EXTENSION

The key for Unicode locale extension ('u').

See also:

- `getExtension(char)`
- `ULocale.Builder.setExtension(char, String)`

Constant Value: 117 (0x00000075)

## Fields

### CANADA

    public static final ULocale CANADA

Useful constant for country/region.

### CANADA_FRENCH

    public static final ULocale CANADA_FRENCH

Useful constant for country/region.

### CHINA

    public static final ULocale CHINA

Useful constant for country/region.

### CHINESE

    public static final ULocale CHINESE

Useful constant for language.

### ENGLISH

    public static final ULocale ENGLISH

Useful constant for language.

### FRANCE

    public static final ULocale FRANCE

Useful constant for country/region.

### FRENCH

    public static final ULocale FRENCH

Useful constant for language.

### GERMAN

    public static final ULocale GERMAN

Useful constant for language.

### GERMANY

    public static final ULocale GERMANY

Useful constant for country/region.

### ITALIAN

    public static final ULocale ITALIAN

Useful constant for language.

### ITALY

    public static final ULocale ITALY

Useful constant for country/region.

### JAPAN

    public static final ULocale JAPAN

Useful constant for country/region.

### JAPANESE

    public static final ULocale JAPANESE

Useful constant for language.

### KOREA

    public static final ULocale KOREA

Useful constant for country/region.

### KOREAN

    public static final ULocale KOREAN

Useful constant for language.

### PRC

    public static final ULocale PRC

Useful constant for country/region.

### ROOT

    public static final ULocale ROOT

The root ULocale.

### SIMPLIFIED_CHINESE

    public static final ULocale SIMPLIFIED_CHINESE

Useful constant for language.

### TAIWAN

    public static final ULocale TAIWAN

Useful constant for country/region.

### TRADITIONAL_CHINESE

    public static final ULocale TRADITIONAL_CHINESE

Useful constant for language.

### UK

    public static final ULocale UK

Useful constant for country/region.

### US

    public static final ULocale US

Useful constant for country/region.

## Public constructors

### 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(String)` or `canonicalize(String)` if you need to canonicalize the localeID.

Parameters
`localeID` | `String`: string representation of the locale, e.g: "en_US", "sy_Cyrl_YU", "zh__pinyin", "es_ES@currency=EUR;collation=traditional"

### ULocale

    public ULocale (String a,
                    String b)

Convenience overload of ULocale(String, String, String) for compatibility with java.util.Locale.

Parameters
`a` | `String`
`b` | `String`

See also:

- `ULocale(String, String, String)`

### 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` | `String`: first component of the locale id
`b` | `String`: second component of the locale id
`c` | `String`: third component of the locale id

See also:

- `ULocale(String)`

## Public methods

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

Returns
`ULocale` | one of the locales from the ULocale.getAvailableLocales() list, or null if none match

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

Returns
`ULocale` | one of the locales from the availableLocales list, or null if none match

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

Returns
`ULocale` | one of the locales from the availableLocales list, or null if none match

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

Returns
`ULocale` | one of the locales from the ULocale.getAvailableLocales() list, or null if none match

### 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` | `ULocale`: The ULocale to maximize

Returns
`ULocale` | The maximized ULocale instance.

### canonicalize

    public static String canonicalize (String localeID)

[icu] Returns the canonical name according to CLDR for the specified locale ID. This is used to convert POSIX and other legacy IDs to standard ICU form.

Parameters
`localeID` | `String`: the locale id

Returns
`String` | the canonicalized id

### 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'.

Returns
`Object` | a clone of this instance.

### compareTo

    public int compareTo (ULocale other)

Compares two ULocale for ordering.

Note: The order might change in future.

Parameters
`other` | `ULocale`: the ULocale to be compared.

Returns
`int` | a negative integer, zero, or a positive integer as this ULocale is less than, equal to, or greater than the specified ULocale.

Throws
`NullPointerException` | if `other` is null.

### createCanonical

    public static ULocale createCanonical (String nonCanonicalID)

[icu] Creates a ULocale from the id by first canonicalizing the id according to CLDR.

Parameters
`nonCanonicalID` | `String`: the locale id to canonicalize

Returns
`ULocale` | the locale created from the canonical version of the ID.

### 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.

Parameters
`obj` | `Object`: the reference object with which to compare.

Returns
`boolean` | true if this Locale is equal to the specified object.

### forLanguageTag

    public static ULocale forLanguageTag (String languageTag)

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` 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 BCP 47, and so supports legacy language tags (marked as “Type: grandfathered” in BCP 47) (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 legacy tags are converted to their canonical replacements where they exist.

Note that a few legacy tags have no modern replacement; these will be converted using the fallback described in the first paragraph, so some information might be lost.

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

Parameters
`languageTag` | `String`: the language tag

Returns
`ULocale` | The locale that best represents the language tag.

Throws
`NullPointerException` | if `languageTag` is `null`

See also:

- `toLanguageTag()`
- `ULocale.Builder.setLanguageTag(String)`

### forLocale

    public static ULocale forLocale (Locale loc)

[icu] Returns a ULocale object for a `Locale`. The ULocale is canonicalized.

Parameters
`loc` | `Locale`: a `Locale`

Returns
`ULocale` |

### 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.

Returns
`ULocale[]` |

### getAvailableLocalesByType

    public static Collection<ULocale> getAvailableLocalesByType (ULocale.AvailableType type)

Returns a list of all installed locales according to the specified type.

Parameters
`type` | `ULocale.AvailableType`

Returns
`Collection<ULocale>` |

### getBaseName

    public String getBaseName ()

[icu] Returns the (normalized) base name for this locale, like `getName()`, but without keywords.

Returns
`String` | the base name as a String.

### getBaseName

    public static String getBaseName (String localeID)

[icu] Returns the (normalized) base name for the specified locale, like `getName(java.lang.String)`, but without keywords.

Parameters
`localeID` | `String`: the locale ID as a string

Returns
`String` | the base name as a String.

### 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
`String` | The locale's layout orientation for characters.

### getCountry

    public static String getCountry (String localeID)

[icu] 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` | `String`: The locale identification string.

Returns
`String` |

See also:

- `getDisplayCountry()`
- `getDisplayCountry(ULocale)`

### 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.

Returns
`String` |

See also:

- `getDisplayCountry()`
- `getDisplayCountry(ULocale)`

### 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.

Returns
`ULocale` | the default ULocale.

### getDefault

    public static ULocale getDefault (ULocale.Category category)

Returns the current default ULocale for the specified category.

Parameters
`category` | `ULocale.Category`: the category

Returns
`ULocale` | the default ULocale for the specified category.

### getDisplayCountry

    public String getDisplayCountry ()

Returns this locale's country localized for display in the default `DISPLAY` locale. Warning: this is for the region part of a valid locale ID; it cannot just be the region code (like "FR"). To get the display name for a region alone, or for other options, use `LocaleDisplayNames` instead.

Returns
`String` | the localized country name.

See also:

- `ULocale.Category.DISPLAY`

### getDisplayCountry

    public static String getDisplayCountry (String localeID,
                    String displayLocaleID)

[icu] Returns a locale's country localized for display in the provided locale. Warning: this is for the region part of a valid locale ID; it cannot just be the region code (like "FR"). To get the display name for a region alone, or for other options, use `LocaleDisplayNames` instead. This is a cover for the ICU4C API.

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

Returns
`String` | the localized country name.

### getDisplayCountry

    public String getDisplayCountry (ULocale displayLocale)

Returns this locale's country localized for display in the provided locale. Warning: this is for the region part of a valid locale ID; it cannot just be the region code (like "FR"). To get the display name for a region alone, or for other options, use `LocaleDisplayNames` instead.

Parameters
`displayLocale` | `ULocale`: the locale in which to display the name.

Returns
`String` | the localized country name.

### getDisplayCountry

    public static String getDisplayCountry (String localeID,
                    ULocale displayLocale)

[icu] Returns a locale's country localized for display in the provided locale. Warning: this is for the region part of a valid locale ID; it cannot just be the region code (like "FR"). To get the display name for a region alone, or for other options, use `LocaleDisplayNames` instead. This is a cover for the ICU4C API.

Parameters
`localeID` | `String`: the id of the locale whose country will be displayed.
`displayLocale` | `ULocale`: the locale in which to display the name.

Returns
`String` | the localized country name.

### getDisplayKeyword

    public static String getDisplayKeyword (String keyword,
                    ULocale displayLocale)

[icu] Returns a keyword localized for display in the specified locale.

Parameters
`keyword` | `String`: the keyword to be displayed.
`displayLocale` | `ULocale`: the locale in which to display the keyword.

Returns
`String` | the localized keyword name.

See also:

- `getKeywords(String)`

### getDisplayKeyword

    public static String getDisplayKeyword (String keyword,
                    String displayLocaleID)

[icu] Returns a keyword localized for display in the specified locale.

Parameters
`keyword` | `String`: the keyword to be displayed.
`displayLocaleID` | `String`: the id of the locale in which to display the keyword.

Returns
`String` | the localized keyword name.

See also:

- `getKeywords(String)`

### getDisplayKeyword

    public static String getDisplayKeyword (String keyword)

[icu] Returns a keyword localized for display in the default `DISPLAY` locale.

Parameters
`keyword` | `String`: the keyword to be displayed.

Returns
`String` | the localized keyword name.

See also:

- `getKeywords()`
- `ULocale.Category.DISPLAY`

### 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` | `String`: the id of the locale whose keyword value is to be displayed.
`keyword` | `String`: the keyword whose value is to be displayed.
`displayLocaleID` | `String`: the id of the locale in which to display the value.

Returns
`String` | the localized value name.

### 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` | `String`: the id of the locale whose keyword value is to be displayed.
`keyword` | `String`: the keyword whose value is to be displayed.
`displayLocale` | `ULocale`: the id of the locale in which to display the value.

Returns
`String` | the localized value name.

### getDisplayKeywordValue

    public String getDisplayKeywordValue (String keyword)

[icu] Returns a keyword value localized for display in the default `DISPLAY` locale.

Parameters
`keyword` | `String`: the keyword whose value is to be displayed.

Returns
`String` | the localized value name.

See also:

- `ULocale.Category.DISPLAY`

### getDisplayKeywordValue

    public String getDisplayKeywordValue (String keyword,
                    ULocale displayLocale)

[icu] Returns a keyword value localized for display in the specified locale.

Parameters
`keyword` | `String`: the keyword whose value is to be displayed.
`displayLocale` | `ULocale`: the locale in which to display the value.

Returns
`String` | the localized value name.

### getDisplayLanguage

    public String getDisplayLanguage (ULocale displayLocale)

Returns this locale's language localized for display in the provided locale.

Parameters
`displayLocale` | `ULocale`: the locale in which to display the name.

Returns
`String` | the localized language name.

### getDisplayLanguage

    public static String getDisplayLanguage (String localeID,
                    ULocale displayLocale)

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

Parameters
`localeID` | `String`: the id of the locale whose language will be displayed.
`displayLocale` | `ULocale`: the locale in which to display the name.

Returns
`String` | the localized language name.

### getDisplayLanguage

    public static String getDisplayLanguage (String localeID,
                    String displayLocaleID)

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

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

Returns
`String` | the localized language name.

### getDisplayLanguage

    public String getDisplayLanguage ()

Returns this locale's language localized for display in the default `DISPLAY` locale.

Returns
`String` | the localized language name.

See also:

- `ULocale.Category.DISPLAY`

### 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` | `ULocale`: the locale in which to display the name.

Returns
`String` | the localized language name.

### 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` | `String`: the id of the locale whose language will be displayed
`displayLocaleID` | `String`: the id of the locale in which to display the name.

Returns
`String` | the localized language name.

### 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` | `String`: the id of the locale whose language will be displayed.
`displayLocale` | `ULocale`: the locale in which to display the name.

Returns
`String` | the localized language name.

### 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
`String` | the localized language name.

See also:

- `ULocale.Category.DISPLAY`

### getDisplayName

    public String getDisplayName ()

Returns this locale name localized for display in the default `DISPLAY` locale.

Returns
`String` | the localized locale name.

See also:

- `ULocale.Category.DISPLAY`

### getDisplayName

    public String getDisplayName (ULocale displayLocale)

Returns this locale name localized for display in the provided locale.

Parameters
`displayLocale` | `ULocale`: the locale in which to display the locale name.

Returns
`String` | the localized locale name.

### getDisplayName

    public static String getDisplayName (String localeID,
                    String displayLocaleID)

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

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

Returns
`String` | the localized locale name.

### getDisplayName

    public static String getDisplayName (String localeID,
                    ULocale displayLocale)

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

Parameters
`localeID` | `String`: the locale whose name is to be displayed.
`displayLocale` | `ULocale`: the locale in which to display the locale name.

Returns
`String` | the localized locale name.

### 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` | `String`: the locale whose name is to be displayed.
`displayLocaleID` | `String`: the id of the locale in which to display the locale name.

Returns
`String` | the localized locale name.

### 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` | `String`: the locale whose name is to be displayed.
`displayLocale` | `ULocale`: the locale in which to display the locale name.

Returns
`String` | the localized locale name.

### 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` | `ULocale`: the locale in which to display the locale name.

Returns
`String` | the localized locale name.

### 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
`String` | the localized locale name.

See also:

- `ULocale.Category.DISPLAY`

### 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` | `String`: the id of the locale whose script will be displayed
`displayLocaleID` | `String`: the id of the locale in which to display the name.

Returns
`String` | the localized script name.

### getDisplayScript

    public static String getDisplayScript (String localeID,
                    ULocale displayLocale)

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

Parameters
`localeID` | `String`: the id of the locale whose script will be displayed.
`displayLocale` | `ULocale`: the locale in which to display the name.

Returns
`String` | the localized script name.

### getDisplayScript

    public String getDisplayScript ()

Returns this locale's script localized for display in the default `DISPLAY` locale.

Returns
`String` | the localized script name.

See also:

- `ULocale.Category.DISPLAY`

### getDisplayScript

    public String getDisplayScript (ULocale displayLocale)

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

Parameters
`displayLocale` | `ULocale`: the locale in which to display the name.

Returns
`String` | the localized script name.

### getDisplayVariant

    public static String getDisplayVariant (String localeID,
                    String displayLocaleID)

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

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

Returns
`String` | the localized variant name.

### getDisplayVariant

    public String getDisplayVariant ()

Returns this locale's variant localized for display in the default `DISPLAY` locale.

Returns
`String` | the localized variant name.

See also:

- `ULocale.Category.DISPLAY`

### getDisplayVariant

    public String getDisplayVariant (ULocale displayLocale)

Returns this locale's variant localized for display in the provided locale.

Parameters
`displayLocale` | `ULocale`: the locale in which to display the name.

Returns
`String` | the localized variant name.

### getDisplayVariant

    public static String getDisplayVariant (String localeID,
                    ULocale displayLocale)

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

Parameters
`localeID` | `String`: the id of the locale whose variant will be displayed.
`displayLocale` | `ULocale`: the locale in which to display the name.

Returns
`String` | the localized variant name.

### getExtension

    public String getExtension (char key)

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` | `char`: the extension key

Returns
`String` | 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`

### getExtensionKeys

    public Set<Character> getExtensionKeys ()

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
`Set<Character>` | the set of extension keys, or the empty set if this locale has no extensions

### getFallback

    public ULocale getFallback ()

[icu] Returns the fallback locale for this locale. If this locale is root, returns null.

Returns
`ULocale` |

### getFallback

    public static String getFallback (String localeID)

[icu] Returns the fallback locale for the specified locale, which might be the empty string.

Parameters
`localeID` | `String`

Returns
`String` |

### 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.

Returns
`String` |

Throws
`MissingResourceException` | Throws MissingResourceException if the three-letter country abbreviation is not available for this locale.

### getISO3Country

    public static String getISO3Country (String localeID)

[icu] 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.

Parameters
`localeID` | `String`

Returns
`String` |

Throws
`MissingResourceException` | Throws MissingResourceException if the three-letter country abbreviation is not available for this locale.

### 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`

Returns
`String` |

Throws
`MissingResourceException` | Throws MissingResourceException if the three-letter language abbreviation is not available for this locale.

### getISO3Language

    public static String getISO3Language (String localeID)

[icu] 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`

Parameters
`localeID` | `String`

Returns
`String` |

Throws
`MissingResourceException` | Throws MissingResourceException if the three-letter language abbreviation is not available for this locale.

### getISOCountries

    public static String[] getISOCountries ()

Returns a list of all 2-letter country codes defined in ISO 3166. Can be used to create Locales.

Returns
`String[]` |

### 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.]

Returns
`String[]` |

### 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
`localeID` | `String`
`keywordName` | `String`: name of the keyword whose value is desired. Case insensitive.

Returns
`String` | String the value of the keyword as a string

### 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` | `String`: name of the keyword whose value is desired. Case insensitive.

Returns
`String` | the value of the keyword, or null.

### 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.

Parameters
`localeID` | `String`

Returns
`Iterator<String>` | an iterator over the keywords in the specified locale, or null if there are no keywords.

### getKeywords

    public Iterator<String> getKeywords ()

[icu] Returns an iterator over keywords for this locale. If there are no keywords, returns null.

Returns
`Iterator<String>` | iterator over keywords, or null if there are no keywords.

### 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.

Parameters
`localeID` | `String`

Returns
`String` |

See also:

- `getDisplayLanguage()`
- `getDisplayLanguage(ULocale)`

### getLanguage

    public String getLanguage ()

Returns the language code for this locale, which will either be the empty string or a lowercase ISO 639 code.

Returns
`String` |

See also:

- `getDisplayLanguage()`
- `getDisplayLanguage(ULocale)`

### 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
`String` | The locale's layout orientation for lines.

### getName

    public String getName ()

[icu] Returns the (normalized) full name for this locale.

Returns
`String` | String the full name of the localeID

### getName

    public static String getName (String localeID)

[icu] Returns the (normalized) full name for the specified locale.

Parameters
`localeID` | `String`: the localeID as a string

Returns
`String` | String the full name of the localeID

### getScript

    public String getScript ()

Returns the script code for this locale, which might be the empty string.

Returns
`String` |

See also:

- `getDisplayScript()`
- `getDisplayScript(ULocale)`

### getScript

    public static String getScript (String localeID)

[icu] Returns the script code for the specified locale, which might be the empty string.

Parameters
`localeID` | `String`

Returns
`String` |

See also:

- `getDisplayScript()`
- `getDisplayScript(ULocale)`

### getUnicodeLocaleAttributes

    public Set<String> getUnicodeLocaleAttributes ()

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
`Set<String>` | The set of attributes.

### getUnicodeLocaleKeys

    public Set<String> getUnicodeLocaleKeys ()

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
`Set<String>` | The set of Unicode locale keys, or the empty set if this locale has no Unicode locale keywords.

### getUnicodeLocaleType

    public String getUnicodeLocaleType (String key)

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` | `String`: the Unicode locale key

Returns
`String` | 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

### getVariant

    public String getVariant ()

Returns the variant code for this locale, which might be the empty string.

Returns
`String` |

See also:

- `getDisplayVariant()`
- `getDisplayVariant(ULocale)`

### getVariant

    public static String getVariant (String localeID)

[icu] Returns the variant code for the specified locale, which might be the empty string.

Parameters
`localeID` | `String`

Returns
`String` |

See also:

- `getDisplayVariant()`
- `getDisplayVariant(ULocale)`

### hashCode

    public int hashCode ()

Returns the hashCode.

Returns
`int` | a hash code value for this object.

### isRightToLeft

    public boolean isRightToLeft ()

[icu] Returns whether this locale's script is written right-to-left. If there is no script subtag, then the likely script is used, see `addLikelySubtags(android.icu.util.ULocale)`. If no likely script is known, then false is returned.

A script is right-to-left according to the CLDR script metadata which corresponds to whether the script's letters have Bidi_Class=R or AL.

Returns true for "ar" and "en-Hebr", false for "zh" and "fa-Cyrl".

Returns
`boolean` | true if the locale's script is written right-to-left

### 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` | `ULocale`: The ULocale to minimize

Returns
`ULocale` | The minimized ULocale instance.

### setKeywordValue

    public ULocale setKeywordValue (String keyword,
                    String value)

[icu] Given a keyword and a value, return a new locale with an updated keyword and value. If the 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.

Related: `getBaseName()` returns the locale ID string with all keywords removed.

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

Returns
`ULocale` | the updated locale

### 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 the 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.

Related: `getBaseName(java.lang.String)` returns the locale ID string with all keywords removed.

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

Returns
`String` | the updated locale id

### toLanguageTag

    public String toLanguageTag ()

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
`String` | a BCP47 language tag representing the locale

See also:

- `forLanguageTag(String)`

### toLegacyKey

    public static String toLegacyKey (String keyword)

[icu] Converts the specified keyword (BCP 47 Unicode locale extension key, or legacy key) to the legacy key. For example, legacy key "collation" is returned for the input BCP 47 Unicode locale extension key "co".

Parameters
`keyword` | `String`: the input locale keyword (either BCP 47 Unicode locale extension key or legacy key).

Returns
`String` | the well-formed legacy key, or null if the specified keyword cannot be mapped to a well-formed legacy key.

See also:

- `toUnicodeLocaleKey(String)`

### toLegacyType

    public static String toLegacyType (String keyword,
                    String value)

[icu] Converts the specified keyword value (BCP 47 Unicode locale extension type, or legacy type or type alias) to the canonical legacy type. For example, the legacy type "phonebook" is returned for the input BCP 47 Unicode locale extension type "phonebk" with the keyword "collation" (or "co").

When the specified keyword is not recognized, but the specified value satisfies the syntax of legacy key, or when the specified keyword allows 'variable' type and the specified value satisfies the syntax, the lower-case version of the input value will be returned. For example, `toLegacyType("Foo", "Bar")` returns "bar", `toLegacyType("vt", "00A4")` returns "00a4".

Parameters
`keyword` | `String`: the locale keyword (either legacy keyword such as "collation" or BCP 47 Unicode locale extension key such as "co").
`value` | `String`: the locale keyword value (either BCP 47 Unicode locale extension type such as "phonebk" or legacy keyword value such as "phonebook").

Returns
`String` | the well-formed legacy type, or null if the specified keyword value cannot be mapped to a well-formed legacy type.

See also:

- `toUnicodeLocaleType(String, String)`

### toLocale

    public Locale toLocale ()

[icu] Converts this ULocale object to a `Locale`.

Returns
`Locale` | a `Locale` that either exactly represents this object or is the closest approximation.

### toString

    public String toString ()

Returns a string representation of this object.

Returns
`String` | a string representation of the object.

### toUnicodeLocaleKey

    public static String toUnicodeLocaleKey (String keyword)

[icu] Converts the specified keyword (legacy key, or BCP 47 Unicode locale extension key) to the equivalent BCP 47 Unicode locale extension key. For example, BCP 47 Unicode locale extension key "co" is returned for the input keyword "collation".

When the specified keyword is unknown, but satisfies the BCP syntax, then the lower-case version of the input keyword will be returned. For example, `toUnicodeLocaleKey("ZZ")` returns "zz".

Parameters
`keyword` | `String`: the input locale keyword (either legacy key such as "collation" or BCP 47 Unicode locale extension key such as "co").

Returns
`String` | the well-formed BCP 47 Unicode locale extension key, or null if the specified locale keyword cannot be mapped to a well-formed BCP 47 Unicode locale extension key.

See also:

- `toLegacyKey(String)`

### toUnicodeLocaleType

    public static String toUnicodeLocaleType (String keyword,
                    String value)

[icu] Converts the specified keyword value (legacy type, or BCP 47 Unicode locale extension type) to the well-formed BCP 47 Unicode locale extension type for the specified keyword (category). For example, BCP 47 Unicode locale extension type "phonebk" is returned for the input keyword value "phonebook", with the keyword "collation" (or "co").

When the specified keyword is not recognized, but the specified value satisfies the syntax of the BCP 47 Unicode locale extension type, or when the specified keyword allows 'variable' type and the specified value satisfies the syntax, the lower-case version of the input value will be returned. For example, `toUnicodeLocaleType("Foo", "Bar")` returns "bar", `toUnicodeLocaleType("variableTop", "00A4")` returns "00a4".

Parameters
`keyword` | `String`: the locale keyword (either legacy key such as "collation" or BCP 47 Unicode locale extension key such as "co").
`value` | `String`: the locale keyword value (either legacy type such as "phonebook" or BCP 47 Unicode locale extension type such as "phonebk").

Returns
`String` | the well-formed BCP47 Unicode locale extension type, or null if the locale keyword value cannot be mapped to a well-formed BCP 47 Unicode locale extension type.

See also:

- `toLegacyType(String, String)`

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