Module java.base
Package java.util.spi

## Class TimeZoneNameProvider

- java.lang.Object
- - java.util.spi.LocaleServiceProvider
  - - java.util.spi.TimeZoneNameProvider

-     public abstract class TimeZoneNameProvider
      extends LocaleServiceProvider

  An abstract class for service providers that provide localized time zone names for the `TimeZone` class. The localized time zone names available from the implementations of this class are also the source for the `DateFormatSymbols.getZoneStrings()` method.
  Since:
    1.6

- - ### Constructor Summary

    Constructors
    Modifier | Constructor | Description
    --- | --- | ---
    `protected` | `TimeZoneNameProvider​()` | Sole constructor.

  - ### Method Summary

    All Methods Instance Methods Abstract Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `abstract String` | `getDisplayName​(String ID, boolean daylight, int style, Locale locale)` | Returns a name for the given time zone ID that's suitable for presentation to the user in the specified locale.
    `String` | `getGenericDisplayName​(String ID, int style, Locale locale)` | Returns a generic name for the given time zone `ID` that's suitable for presentation to the user in the specified `locale`.

    - ### Methods inherited from class java.util.spi.LocaleServiceProvider

      `getAvailableLocales, isSupportedLocale`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### TimeZoneNameProvider

          protected TimeZoneNameProvider​()

      Sole constructor. (For invocation by subclass constructors, typically implicit.)

  - ### Method Detail

    - #### getDisplayName

          public abstract String getDisplayName​(String ID,
                                                boolean daylight,
                                                int style,
                                                Locale locale)

      Returns a name for the given time zone ID that's suitable for presentation to the user in the specified locale. The given time zone ID is "GMT" or one of the names defined using "Zone" entries in the "tz database", a public domain time zone database at ftp://elsie.nci.nih.gov/pub/. The data of this database is contained in a file whose name starts with "tzdata", and the specification of the data format is part of the zic.8 man page, which is contained in a file whose name starts with "tzcode".

      If `daylight` is true, the method should return a name appropriate for daylight saving time even if the specified time zone has not observed daylight saving time in the past.

      Parameters:
        `ID` - a time zone ID string
        `daylight` - if true, return the daylight saving name.
        `style` - either `TimeZone.LONG` or `TimeZone.SHORT`
        `locale` - the desired locale
      Returns:
        the human-readable name of the given time zone in the given locale, or null if it's not available.
      Throws:
        `IllegalArgumentException` - if `style` is invalid, or `locale` isn't one of the locales returned from `getAvailableLocales()`.
        `NullPointerException` - if `ID` or `locale` is null
      See Also:
        `TimeZone.getDisplayName(boolean, int, java.util.Locale)`

    - #### getGenericDisplayName

          public String getGenericDisplayName​(String ID,
                                              int style,
                                              Locale locale)

      Returns a generic name for the given time zone `ID` that's suitable for presentation to the user in the specified `locale`. Generic time zone names are neutral from standard time and daylight saving time. For example, "PT" is the short generic name of time zone ID `America/Los_Angeles`, while its short standard time and daylight saving time names are "PST" and "PDT", respectively. Refer to `getDisplayName` for valid time zone IDs.

      The default implementation of this method returns `null`.

      Parameters:
        `ID` - a time zone ID string
        `style` - either `TimeZone.LONG` or `TimeZone.SHORT`
        `locale` - the desired locale
      Returns:
        the human-readable generic name of the given time zone in the given locale, or `null` if it's not available.
      Throws:
        `IllegalArgumentException` - if `style` is invalid, or `locale` isn't one of the locales returned from `getAvailableLocales()`.
        `NullPointerException` - if `ID` or `locale` is `null`
      Since:
        1.8