JapaneseChronology (Java Platform SE 8 b92)

java.lang.Object
- java.time.chrono.Chronology
- - java.time.chrono.JapaneseChronology

All Implemented Interfaces:

Serializable, Comparable<Chronology>
```
public final class JapaneseChronology
extends Chronology
implements Serializable
```
The Japanese Imperial calendar system.
This chronology defines the rules of the Japanese Imperial calendar system. This calendar system is primarily used in Japan. The Japanese Imperial calendar system is the same as the ISO calendar system apart from the era-based year numbering.
Only Meiji (1865-04-07 - 1868-09-07) and later eras are supported. Older eras are handled as an unknown era where the year-of-era is the ISO year.

Implementation Requirements:

This class is immutable and thread-safe.

Since:

1.8

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field and Description

static JapaneseChronology INSTANCE
Singleton instance for Japanese chronology.

Fields
Modifier and Type	Field and Description
`static JapaneseChronology`	`INSTANCE` Singleton instance for Japanese chronology.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`JapaneseDate`	`date(Era era, int yearOfEra, int month, int dayOfMonth)` Obtains a local date in Japanese calendar system from the era, year-of-era, month-of-year and day-of-month fields.
`JapaneseDate`	`date(int prolepticYear, int month, int dayOfMonth)` Obtains a local date in Japanese calendar system from the proleptic-year, month-of-year and day-of-month fields.
`JapaneseDate`	`date(TemporalAccessor temporal)` Obtains a local date in this chronology from another temporal object.
`JapaneseDate`	`dateEpochDay(long epochDay)` Obtains a local date in the Japanese calendar system from the epoch-day.
`JapaneseDate`	`dateNow()` Obtains the current local date in this chronology from the system clock in the default time-zone.
`JapaneseDate`	`dateNow(Clock clock)` Obtains the current local date in this chronology from the specified clock.
`JapaneseDate`	`dateNow(ZoneId zone)` Obtains the current local date in this chronology from the system clock in the specified time-zone.
`JapaneseDate`	`dateYearDay(Era era, int yearOfEra, int dayOfYear)` Obtains a local date in Japanese calendar system from the era, year-of-era and day-of-year fields.
`JapaneseDate`	`dateYearDay(int prolepticYear, int dayOfYear)` Obtains a local date in Japanese calendar system from the proleptic-year and day-of-year fields.
`Era`	`eraOf(int eraValue)` Returns the calendar system era object from the given numeric value.
`List<Era>`	`eras()` Gets the list of eras for the chronology.
`String`	`getCalendarType()` Gets the calendar type of the underlying calendar system - 'japanese'.
`String`	`getId()` Gets the ID of the chronology - 'Japanese'.
`boolean`	`isLeapYear(long prolepticYear)` Checks if the specified year is a leap year.
`ChronoLocalDateTime<JapaneseDate>`	`localDateTime(TemporalAccessor temporal)` Obtains a local date-time in this chronology from another temporal object.
`int`	`prolepticYear(Era era, int yearOfEra)` Calculates the proleptic-year given the era and year-of-era.
`ValueRange`	`range(ChronoField field)` Gets the range of valid values for the specified field.
`ChronoZonedDateTime<JapaneseDate>`	`zonedDateTime(Instant instant, ZoneId zone)` Obtains a `ChronoZonedDateTime` in this chronology from an `Instant`.
`ChronoZonedDateTime<JapaneseDate>`	`zonedDateTime(TemporalAccessor temporal)` Obtains a `ChronoZonedDateTime` in this chronology from another temporal object.

Methods inherited from class java.time.chrono.Chronology
compareTo, equals, from, getAvailableChronologies, getDisplayName, hashCode, of, ofLocale, resolveDate, toString, writeReplace

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

- Field Detail
  - INSTANCE
```
public static final JapaneseChronology INSTANCE
```
    Singleton instance for Japanese chronology.
- Method Detail
  - getId
```
public String getId()
```
    Gets the ID of the chronology - 'Japanese'.
    The ID uniquely identifies the Chronology. It can be used to lookup the Chronology using Chronology.of(String).
    
    Specified by:
    
    getId in class Chronology
    
    Returns:
    
    the chronology ID - 'Japanese'
    
    See Also:
    
    getCalendarType()
  - getCalendarType
```
public String getCalendarType()
```
    Gets the calendar type of the underlying calendar system - 'japanese'.
    The calendar type is an identifier defined by the Unicode Locale Data Markup Language (LDML) specification. It can be used to lookup the Chronology using Chronology.of(String). It can also be used as part of a locale, accessible via Locale.getUnicodeLocaleType(String) with the key 'ca'.
    
    Specified by:
    
    getCalendarType in class Chronology
    
    Returns:
    
    the calendar system type - 'japanese'
    
    See Also:
    
    getId()
  - date
```
public JapaneseDate date(Era era,
                         int yearOfEra,
                         int month,
                         int dayOfMonth)
```
    Obtains a local date in Japanese calendar system from the era, year-of-era, month-of-year and day-of-month fields.
    
    Overrides:
    
    date in class Chronology
    
    Parameters:
    
    era - the Japanese era, not null
    
    yearOfEra - the year-of-era
    
    month - the month-of-year
    
    dayOfMonth - the day-of-month
    
    Returns:
    
    the Japanese local date, not null
    
    Throws:
    
    DateTimeException - if unable to create the date
    
    ClassCastException - if the era is not a JapaneseEra
  - date
```
public JapaneseDate date(int prolepticYear,
                         int month,
                         int dayOfMonth)
```
    Obtains a local date in Japanese calendar system from the proleptic-year, month-of-year and day-of-month fields.
    
    Specified by:
    
    date in class Chronology
    
    Parameters:
    
    prolepticYear - the proleptic-year
    
    month - the month-of-year
    
    dayOfMonth - the day-of-month
    
    Returns:
    
    the Japanese local date, not null
    
    Throws:
    
    DateTimeException - if unable to create the date
  - dateYearDay
```
public JapaneseDate dateYearDay(Era era,
                                int yearOfEra,
                                int dayOfYear)
```
    Obtains a local date in Japanese calendar system from the era, year-of-era and day-of-year fields.
    
    Overrides:
    
    dateYearDay in class Chronology
    
    Parameters:
    
    era - the Japanese era, not null
    
    yearOfEra - the year-of-era
    
    dayOfYear - the day-of-year
    
    Returns:
    
    the Japanese local date, not null
    
    Throws:
    
    DateTimeException - if unable to create the date
    
    ClassCastException - if the era is not a JapaneseEra
  - dateYearDay
```
public JapaneseDate dateYearDay(int prolepticYear,
                                int dayOfYear)
```
    Obtains a local date in Japanese calendar system from the proleptic-year and day-of-year fields.
    
    Specified by:
    
    dateYearDay in class Chronology
    
    Parameters:
    
    prolepticYear - the proleptic-year
    
    dayOfYear - the day-of-year
    
    Returns:
    
    the Japanese local date, not null
    
    Throws:
    
    DateTimeException - if unable to create the date
  - dateEpochDay
```
public JapaneseDate dateEpochDay(long epochDay)
```
    Obtains a local date in the Japanese calendar system from the epoch-day.
    
    Specified by:
    
    dateEpochDay in class Chronology
    
    Parameters:
    
    epochDay - the epoch day
    
    Returns:
    
    the Japanese local date, not null
    
    Throws:
    
    DateTimeException - if unable to create the date
  - dateNow
```
public JapaneseDate dateNow()
```
    Description copied from class: Chronology
    
    Obtains the current local date in this chronology from the system clock in the default time-zone.
    This will query the system clock in the default time-zone to obtain the current date.
    Using this method will prevent the ability to use an alternate clock for testing because the clock is hard-coded.
    This implementation uses Chronology.dateNow(Clock).
    
    Overrides:
    
    dateNow in class Chronology
    
    Returns:
    
    the current local date using the system clock and default time-zone, not null
  - dateNow
```
public JapaneseDate dateNow(ZoneId zone)
```
    Description copied from class: Chronology
    
    Obtains the current local date in this chronology from the system clock in the specified time-zone.
    This will query the system clock to obtain the current date. Specifying the time-zone avoids dependence on the default time-zone.
    Using this method will prevent the ability to use an alternate clock for testing because the clock is hard-coded.
    
    Overrides:
    
    dateNow in class Chronology
    
    Parameters:
    
    zone - the zone ID to use, not null
    
    Returns:
    
    the current local date using the system clock, not null
  - dateNow
```
public JapaneseDate dateNow(Clock clock)
```
    Description copied from class: Chronology
    
    Obtains the current local date in this chronology from the specified clock.
    This will query the specified clock to obtain the current date - today. Using this method allows the use of an alternate clock for testing. The alternate clock may be introduced using dependency injection.
    
    Overrides:
    
    dateNow in class Chronology
    
    Parameters:
    
    clock - the clock to use, not null
    
    Returns:
    
    the current local date, not null
  - date
```
public JapaneseDate date(TemporalAccessor temporal)
```
    Description copied from class: Chronology
    
    Obtains a local date in this chronology from another temporal object.
    This obtains a date in this chronology based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of ChronoLocalDate.
    The conversion typically uses the EPOCH_DAY field, which is standardized across calendar systems.
    This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, aChronology::date.
    
    Specified by:
    
    date in class Chronology
    
    Parameters:
    
    temporal - the temporal object to convert, not null
    
    Returns:
    
    the local date in this chronology, not null
    
    See Also:
    
    ChronoLocalDate.from(TemporalAccessor)
  - localDateTime
```
public ChronoLocalDateTime<JapaneseDate> localDateTime(TemporalAccessor temporal)
```
    Description copied from class: Chronology
    
    Obtains a local date-time in this chronology from another temporal object.
    This obtains a date-time in this chronology based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of ChronoLocalDateTime.
    The conversion extracts and combines the ChronoLocalDate and the LocalTime from the temporal object. Implementations are permitted to perform optimizations such as accessing those fields that are equivalent to the relevant objects. The result uses this chronology.
    This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, aChronology::localDateTime.
    
    Overrides:
    
    localDateTime in class Chronology
    
    Parameters:
    
    temporal - the temporal object to convert, not null
    
    Returns:
    
    the local date-time in this chronology, not null
    
    See Also:
    
    ChronoLocalDateTime.from(TemporalAccessor)
  - zonedDateTime
```
public ChronoZonedDateTime<JapaneseDate> zonedDateTime(TemporalAccessor temporal)
```
    Description copied from class: Chronology
    
    Obtains a ChronoZonedDateTime in this chronology from another temporal object.
    This obtains a zoned date-time in this chronology based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of ChronoZonedDateTime.
    The conversion will first obtain a ZoneId from the temporal object, falling back to a ZoneOffset if necessary. It will then try to obtain an Instant, falling back to a ChronoLocalDateTime if necessary. The result will be either the combination of ZoneId or ZoneOffset with Instant or ChronoLocalDateTime. Implementations are permitted to perform optimizations such as accessing those fields that are equivalent to the relevant objects. The result uses this chronology.
    This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, aChronology::zonedDateTime.
    
    Overrides:
    
    zonedDateTime in class Chronology
    
    Parameters:
    
    temporal - the temporal object to convert, not null
    
    Returns:
    
    the zoned date-time in this chronology, not null
    
    See Also:
    
    ChronoZonedDateTime.from(TemporalAccessor)
  - zonedDateTime
```
public ChronoZonedDateTime<JapaneseDate> zonedDateTime(Instant instant,
                                                       ZoneId zone)
```
    Description copied from class: Chronology
    
    Obtains a ChronoZonedDateTime in this chronology from an Instant.
    This obtains a zoned date-time with the same instant as that specified.
    
    Overrides:
    
    zonedDateTime in class Chronology
    
    Parameters:
    
    instant - the instant to create the date-time from, not null
    
    zone - the time-zone, not null
    
    Returns:
    
    the zoned date-time, not null
  - isLeapYear
```
public boolean isLeapYear(long prolepticYear)
```
    Checks if the specified year is a leap year.
    Japanese calendar leap years occur exactly in line with ISO leap years. This method does not validate the year passed in, and only has a well-defined result for years in the supported range.
    
    Specified by:
    
    isLeapYear in class Chronology
    
    Parameters:
    
    prolepticYear - the proleptic-year to check, not validated for range
    
    Returns:
    
    true if the year is a leap year
  - prolepticYear
```
public int prolepticYear(Era era,
                         int yearOfEra)
```
    Description copied from class: Chronology
    
    Calculates the proleptic-year given the era and year-of-era.
    This combines the era and year-of-era into the single proleptic-year field.
    If the chronology makes active use of eras, such as JapaneseChronology then the year-of-era will be validated against the era. For other chronologies, validation is optional.
    
    Specified by:
    
    prolepticYear in class Chronology
    
    Parameters:
    
    era - the era of the correct type for the chronology, not null
    
    yearOfEra - the chronology year-of-era
    
    Returns:
    
    the proleptic-year
  - eraOf
```
public Era eraOf(int eraValue)
```
    Returns the calendar system era object from the given numeric value. See the description of each Era for the numeric values of: JapaneseEra.HEISEI, JapaneseEra.SHOWA,JapaneseEra.TAISHO, JapaneseEra.MEIJI), only Meiji and later eras are supported. Prior to Meiji JapaneseEra.SEIREKI is used.
    
    Specified by:
    
    eraOf in class Chronology
    
    Parameters:
    
    eraValue - the era value
    
    Returns:
    
    the Japanese Era for the given numeric era value
    
    Throws:
    
    DateTimeException - if eraValue is invalid
  - eras
```
public List<Era> eras()
```
    Description copied from class: Chronology
    
    Gets the list of eras for the chronology.
    Most calendar systems have an era, within which the year has meaning. If the calendar system does not support the concept of eras, an empty list must be returned.
    
    Specified by:
    
    eras in class Chronology
    
    Returns:
    
    the list of eras for the chronology, may be immutable, not null
  - range
```
public ValueRange range(ChronoField field)
```
    Description copied from class: Chronology
    
    Gets the range of valid values for the specified field.
    All fields can be expressed as a long integer. This method returns an object that describes the valid range for that value.
    Note that the result only describes the minimum and maximum valid values and it is important not to read too much into them. For example, there could be values within the range that are invalid for the field.
    This method will return a result whether or not the chronology supports the field.
    
    Specified by:
    
    range in class Chronology
    
    Parameters:
    
    field - the field to get the range for, not null
    
    Returns:
    
    the range of valid values for the field, not null

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DRAFT ea-b92

Class JapaneseChronology

Field Summary

Method Summary

Methods inherited from class java.time.chrono.Chronology

Methods inherited from class java.lang.Object

Field Detail

INSTANCE

Method Detail

getId

getCalendarType

date

date

dateYearDay

dateYearDay

dateEpochDay

dateNow

dateNow

dateNow

date

localDateTime

zonedDateTime

zonedDateTime

isLeapYear

prolepticYear

eraOf

eras

range