Module java.base
Package java.text

## Class DateFormatSymbols

- java.lang.Object
- - java.text.DateFormatSymbols

- All Implemented Interfaces:
    `Serializable`, `Cloneable`

      public class DateFormatSymbols
      extends Object
      implements Serializable, Cloneable

  `DateFormatSymbols` is a public class for encapsulating localizable date-time formatting data, such as the names of the months, the names of the days of the week, and the time zone data. `SimpleDateFormat` uses `DateFormatSymbols` to encapsulate this information.

  Typically you shouldn't use `DateFormatSymbols` directly. Rather, you are encouraged to create a date-time formatter with the `DateFormat` class's factory methods: `getTimeInstance`, `getDateInstance`, or `getDateTimeInstance`. These methods automatically create a `DateFormatSymbols` for the formatter so that you don't have to. After the formatter is created, you may modify its format pattern using the `setPattern` method. For more information about creating formatters using `DateFormat`'s factory methods, see `DateFormat`.

  If you decide to create a date-time formatter with a specific format pattern for a specific locale, you can do so with:

  >      new SimpleDateFormat(aPattern, DateFormatSymbols.getInstance(aLocale)).

  `DateFormatSymbols` objects are cloneable. When you obtain a `DateFormatSymbols` object, feel free to modify the date-time formatting data. For instance, you can replace the localized date-time format pattern characters with the ones that you feel easy to remember. Or you can change the representative cities to your favorite ones.

  New `DateFormatSymbols` subclasses may be added to support `SimpleDateFormat` for date-time formatting for additional locales.

  Since:
    1.1
  See Also:
    `DateFormat`, `SimpleDateFormat`, `SimpleTimeZone`, Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `DateFormatSymbols​()` | Construct a DateFormatSymbols object by loading format data from resources for the default `FORMAT` locale.
    `DateFormatSymbols​(Locale locale)` | Construct a DateFormatSymbols object by loading format data from resources for the given locale.

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `Object` | `clone​()` | Overrides Cloneable
    `boolean` | `equals​(Object obj)` | Override equals
    `String[]` | `getAmPmStrings​()` | Gets ampm strings.
    `static Locale[]` | `getAvailableLocales​()` | Returns an array of all locales for which the `getInstance` methods of this class can return localized instances.
    `String[]` | `getEras​()` | Gets era strings.
    `static DateFormatSymbols` | `getInstance​()` | Gets the `DateFormatSymbols` instance for the default locale.
    `static DateFormatSymbols` | `getInstance​(Locale locale)` | Gets the `DateFormatSymbols` instance for the specified locale.
    `String` | `getLocalPatternChars​()` | Gets localized date-time pattern characters.
    `String[]` | `getMonths​()` | Gets month strings.
    `String[]` | `getShortMonths​()` | Gets short month strings.
    `String[]` | `getShortWeekdays​()` | Gets short weekday strings.
    `String[]` | `getWeekdays​()` | Gets weekday strings.
    `String[][]` | `getZoneStrings​()` | Gets time zone strings.
    `int` | `hashCode​()` | Override hashCode.
    `void` | `setAmPmStrings​(String[] newAmpms)` | Sets ampm strings.
    `void` | `setEras​(String[] newEras)` | Sets era strings.
    `void` | `setLocalPatternChars​(String newLocalPatternChars)` | Sets localized date-time pattern characters.
    `void` | `setMonths​(String[] newMonths)` | Sets month strings.
    `void` | `setShortMonths​(String[] newShortMonths)` | Sets short month strings.
    `void` | `setShortWeekdays​(String[] newShortWeekdays)` | Sets short weekday strings.
    `void` | `setWeekdays​(String[] newWeekdays)` | Sets weekday strings.
    `void` | `setZoneStrings​(String[][] newZoneStrings)` | Sets time zone strings.

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

      `finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### DateFormatSymbols

          public DateFormatSymbols​()

      Construct a DateFormatSymbols object by loading format data from resources for the default `FORMAT` locale. This constructor can only construct instances for the locales supported by the Java runtime environment, not for those supported by installed `DateFormatSymbolsProvider` implementations. For full locale coverage, use the `getInstance` method.

      This is equivalent to calling `DateFormatSymbols(Locale.getDefault(Locale.Category.FORMAT))`.

      Throws:
        `MissingResourceException` - if the resources for the default locale cannot be found or cannot be loaded.
      See Also:
        `getInstance()`, `Locale.getDefault(java.util.Locale.Category)`, `Locale.Category.FORMAT`

    - #### DateFormatSymbols

          public DateFormatSymbols​(Locale locale)

      Construct a DateFormatSymbols object by loading format data from resources for the given locale. This constructor can only construct instances for the locales supported by the Java runtime environment, not for those supported by installed `DateFormatSymbolsProvider` implementations. For full locale coverage, use the `getInstance` method.
      Parameters:
        `locale` - the desired locale
      Throws:
        `MissingResourceException` - if the resources for the specified locale cannot be found or cannot be loaded.
      See Also:
        `getInstance(Locale)`

  - ### Method Detail

    - #### getAvailableLocales

          public static Locale[] getAvailableLocales​()

      Returns an array of all locales for which the `getInstance` methods of this class can return localized instances. The returned array represents the union of locales supported by the Java runtime and by installed `DateFormatSymbolsProvider` implementations. It must contain at least a `Locale` instance equal to `Locale.US`.
      Returns:
        An array of locales for which localized `DateFormatSymbols` instances are available.
      Since:
        1.6

    - #### getInstance

          public static final DateFormatSymbols getInstance​()

      Gets the `DateFormatSymbols` instance for the default locale. This method provides access to `DateFormatSymbols` instances for locales supported by the Java runtime itself as well as for those supported by installed `DateFormatSymbolsProvider` implementations.

      This is equivalent to calling `getInstance(Locale.getDefault(Locale.Category.FORMAT))`.

      Returns:
        a `DateFormatSymbols` instance.
      Since:
        1.6
      See Also:
        `Locale.getDefault(java.util.Locale.Category)`, `Locale.Category.FORMAT`

    - #### getInstance

          public static final DateFormatSymbols getInstance​(Locale locale)

      Gets the `DateFormatSymbols` instance for the specified locale. This method provides access to `DateFormatSymbols` instances for locales supported by the Java runtime itself as well as for those supported by installed `DateFormatSymbolsProvider` implementations.
      Parameters:
        `locale` - the given locale.
      Returns:
        a `DateFormatSymbols` instance.
      Throws:
        `NullPointerException` - if `locale` is null
      Since:
        1.6

    - #### getEras

          public String[] getEras​()

      Gets era strings. For example: "AD" and "BC".
      Returns:
        the era strings.

    - #### setEras

          public void setEras​(String[] newEras)

      Sets era strings. For example: "AD" and "BC".
      Parameters:
        `newEras` - the new era strings.

    - #### getMonths

          public String[] getMonths​()

      Gets month strings. For example: "January", "February", etc.

      If the language requires different forms for formatting and stand-alone usages, this method returns month names in the formatting form. For example, the preferred month name for January in the Czech language is ledna in the formatting form, while it is leden in the stand-alone form. This method returns `"ledna"` in this case. Refer to the Calendar Elements in the Unicode Locale Data Markup Language (LDML) specification for more details.

      Returns:
        the month strings. Use `Calendar.JANUARY`, `Calendar.FEBRUARY`, etc. to index the result array.

    - #### setMonths

          public void setMonths​(String[] newMonths)

      Sets month strings. For example: "January", "February", etc.
      Parameters:
        `newMonths` - the new month strings. The array should be indexed by `Calendar.JANUARY`, `Calendar.FEBRUARY`, etc.

    - #### getShortMonths

          public String[] getShortMonths​()

      Gets short month strings. For example: "Jan", "Feb", etc.

      If the language requires different forms for formatting and stand-alone usages, this method returns short month names in the formatting form. For example, the preferred abbreviation for January in the Catalan language is de gen. in the formatting form, while it is gen. in the stand-alone form. This method returns `"de gen."` in this case. Refer to the Calendar Elements in the Unicode Locale Data Markup Language (LDML) specification for more details.

      Returns:
        the short month strings. Use `Calendar.JANUARY`, `Calendar.FEBRUARY`, etc. to index the result array.

    - #### setShortMonths

          public void setShortMonths​(String[] newShortMonths)

      Sets short month strings. For example: "Jan", "Feb", etc.
      Parameters:
        `newShortMonths` - the new short month strings. The array should be indexed by `Calendar.JANUARY`, `Calendar.FEBRUARY`, etc.

    - #### getWeekdays

          public String[] getWeekdays​()

      Gets weekday strings. For example: "Sunday", "Monday", etc.
      Returns:
        the weekday strings. Use `Calendar.SUNDAY`, `Calendar.MONDAY`, etc. to index the result array.

    - #### setWeekdays

          public void setWeekdays​(String[] newWeekdays)

      Sets weekday strings. For example: "Sunday", "Monday", etc.
      Parameters:
        `newWeekdays` - the new weekday strings. The array should be indexed by `Calendar.SUNDAY`, `Calendar.MONDAY`, etc.

    - #### getShortWeekdays

          public String[] getShortWeekdays​()

      Gets short weekday strings. For example: "Sun", "Mon", etc.
      Returns:
        the short weekday strings. Use `Calendar.SUNDAY`, `Calendar.MONDAY`, etc. to index the result array.

    - #### setShortWeekdays

          public void setShortWeekdays​(String[] newShortWeekdays)

      Sets short weekday strings. For example: "Sun", "Mon", etc.
      Parameters:
        `newShortWeekdays` - the new short weekday strings. The array should be indexed by `Calendar.SUNDAY`, `Calendar.MONDAY`, etc.

    - #### getAmPmStrings

          public String[] getAmPmStrings​()

      Gets ampm strings. For example: "AM" and "PM".
      Returns:
        the ampm strings.

    - #### setAmPmStrings

          public void setAmPmStrings​(String[] newAmpms)

      Sets ampm strings. For example: "AM" and "PM".
      Parameters:
        `newAmpms` - the new ampm strings.

    - #### getZoneStrings

          public String[][] getZoneStrings​()

      Gets time zone strings. Use of this method is discouraged; use `TimeZone.getDisplayName()` instead.

      The value returned is a two-dimensional array of strings of size n by m, where m is at least 5. Each of the n rows is an entry containing the localized names for a single `TimeZone`. Each such row contains (with `i` ranging from 0..n-1):

      - `zoneStrings[i][0]` - time zone ID
      - `zoneStrings[i][1]` - long name of zone in standard time
      - `zoneStrings[i][2]` - short name of zone in standard time
      - `zoneStrings[i][3]` - long name of zone in daylight saving time
      - `zoneStrings[i][4]` - short name of zone in daylight saving time
      The zone ID is not localized; it's one of the valid IDs of the `TimeZone` class that are not custom IDs. All other entries are localized names. If a zone does not implement daylight saving time, the daylight saving time names should not be used.

      If `setZoneStrings` has been called on this `DateFormatSymbols` instance, then the strings provided by that call are returned. Otherwise, the returned array contains names provided by the Java runtime and by installed `TimeZoneNameProvider` implementations.

      Returns:
        the time zone strings.
      See Also:
        `setZoneStrings(String[][])`

    - #### setZoneStrings

          public void setZoneStrings​(String[][] newZoneStrings)

      Sets time zone strings. The argument must be a two-dimensional array of strings of size n by m, where m is at least 5. Each of the n rows is an entry containing the localized names for a single `TimeZone`. Each such row contains (with `i` ranging from 0..n-1):
      - `zoneStrings[i][0]` - time zone ID
      - `zoneStrings[i][1]` - long name of zone in standard time
      - `zoneStrings[i][2]` - short name of zone in standard time
      - `zoneStrings[i][3]` - long name of zone in daylight saving time
      - `zoneStrings[i][4]` - short name of zone in daylight saving time
      The zone ID is not localized; it's one of the valid IDs of the `TimeZone` class that are not custom IDs. All other entries are localized names.
      Parameters:
        `newZoneStrings` - the new time zone strings.
      Throws:
        `IllegalArgumentException` - if the length of any row in `newZoneStrings` is less than 5
        `NullPointerException` - if `newZoneStrings` is null
      See Also:
        `getZoneStrings()`

    - #### getLocalPatternChars

          public String getLocalPatternChars​()

      Gets localized date-time pattern characters. For example: 'u', 't', etc.
      Returns:
        the localized date-time pattern characters.

    - #### setLocalPatternChars

          public void setLocalPatternChars​(String newLocalPatternChars)

      Sets localized date-time pattern characters. For example: 'u', 't', etc.
      Parameters:
        `newLocalPatternChars` - the new localized date-time pattern characters.

    - #### clone

          public Object clone​()

      Overrides Cloneable
      Overrides:
        `clone` in class `Object`
      Returns:
        a clone of this instance.
      See Also:
        `Cloneable`

    - #### hashCode

          public int hashCode​()

      Override hashCode. Generates a hash code for the DateFormatSymbols object.
      Overrides:
        `hashCode` in class `Object`
      Returns:
        a hash code value for this object.
      See Also:
        `Object.equals(java.lang.Object)`, `System.identityHashCode(java.lang.Object)`

    - #### equals

          public boolean equals​(Object obj)

      Override equals
      Overrides:
        `equals` in class `Object`
      Parameters:
        `obj` - the reference object with which to compare.
      Returns:
        `true` if this object is the same as the obj argument; `false` otherwise.
      See Also:
        `Object.hashCode()`, `HashMap`