Class JapaneseEra
- All Implemented Interfaces:
Serializable,Era,TemporalAccessor,TemporalAdjuster
The Japanese government defines the official name and start date of each era. Eras are consecutive and their date ranges do not overlap, so the end date of one era is always the day before the start date of the next era.
The Java SE Platform supports all eras defined by the Japanese government,
beginning with the Meiji era. Each era is identified in the Platform by an
integer value and a name. The of(int) and valueOf(String)
methods may be used to obtain a singleton instance of JapaneseEra
for each era. The values() method returns the singleton instances
of all supported eras.
For convenience, this class declares a number of public static final fields
that refer to singleton instances returned by the values() method.
- API Note:
- The fields declared in this class may evolve over time, in line with the
results of the
values()method. However, there is not necessarily a 1:1 correspondence between the fields and the singleton instances., The Japanese government may announce a new era and define its start date but not its official name. In this scenario, the singleton instance that represents the new era may return a name that is not stable until the official name is defined. Developers should exercise caution when relying on the name returned by any singleton instance that does not correspond to a public static final field. - Implementation Requirements:
- This class is immutable and thread-safe.
- Since:
- 1.8
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final JapaneseEraThe singleton instance for the 'Heisei' era (1989-01-08 - 2019-04-30) which has the value 2.static final JapaneseEraThe singleton instance for the 'Meiji' era (1868-01-01 - 1912-07-29) which has the value -1.static final JapaneseEraThe singleton instance for the 'Reiwa' era (2019-05-01 - ) which has the value 3.static final JapaneseEraThe singleton instance for the 'Showa' era (1926-12-25 - 1989-01-07) which has the value 1.static final JapaneseEraThe singleton instance for the 'Taisho' era (1912-07-30 - 1926-12-24) which has the value 0. -
Method Summary
Modifier and TypeMethodDescriptiongetDisplayName(TextStyle style, Locale locale) Gets the textual representation of this era.intgetValue()Gets the numeric eraintvalue.static JapaneseEraof(int japaneseEra) Obtains an instance ofJapaneseErafrom anintvalue.range(TemporalField field) Gets the range of valid values for the specified field.static JapaneseEraReturns theJapaneseErawith the name.static JapaneseEra[]values()Returns an array of JapaneseEras.Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitMethods declared in interface java.time.chrono.Era
adjustInto, get, getLong, isSupported, query
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Field Details
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MEIJI
The singleton instance for the 'Meiji' era (1868-01-01 - 1912-07-29) which has the value -1. -
TAISHO
The singleton instance for the 'Taisho' era (1912-07-30 - 1926-12-24) which has the value 0. -
SHOWA
The singleton instance for the 'Showa' era (1926-12-25 - 1989-01-07) which has the value 1. -
HEISEI
The singleton instance for the 'Heisei' era (1989-01-08 - 2019-04-30) which has the value 2. -
REIWA
The singleton instance for the 'Reiwa' era (2019-05-01 - ) which has the value 3. The end date of this era is not specified, unless the Japanese Government defines it.- Since:
- 13
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Method Details
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of
Obtains an instance ofJapaneseErafrom anintvalue.- The value
1is associated with the 'Showa' era, because it contains 1970-01-01 (ISO calendar system). - The values
-1and0are associated with two earlier eras, Meiji and Taisho, respectively. - A value greater than
1is associated with a later era, beginning with Heisei (2).
Every instance of
JapaneseErathat is returned from thevalues()method has an int value (available viaEra.getValue()which is accepted by this method.- Parameters:
japaneseEra- the era to represent- Returns:
- the
JapaneseErasingleton, not null - Throws:
DateTimeException- if the value is invalid
- The value
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valueOf
Returns theJapaneseErawith the name.The string must match exactly the name of the era. (Extraneous whitespace characters are not permitted.)
Valid era names are the names of eras returned from
values().- Parameters:
japaneseEra- the japaneseEra name; non-null- Returns:
- the
JapaneseErasingleton, never null - Throws:
IllegalArgumentException- if there is not JapaneseEra with the specified name
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values
Returns an array of JapaneseEras. The array may contain eras defined by the Japanese government beyond the known era singletons.This method may be used to iterate over the JapaneseEras as follows:
for (JapaneseEra c : JapaneseEra.values()) System.out.println(c);- Returns:
- an array of JapaneseEras
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getDisplayName
Gets the textual representation of this era.This returns the textual name used to identify the era, suitable for presentation to the user. The parameters control the style of the returned text and the locale.
If no textual mapping is found then the
numeric valueis returned.- Specified by:
getDisplayNamein interfaceEra- Parameters:
style- the style of the text required, not nulllocale- the locale to use, not null- Returns:
- the text value of the era, not null
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getValue
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range
Gets the range of valid values for the specified field.The range object expresses the minimum and maximum valid values for a field. This era is used to enhance the accuracy of the returned range. If it is not possible to return the range, because the field is not supported or for some other reason, an exception is thrown.
If the field is a
ChronoFieldthen the query is implemented here. TheERAfield returns the range. All otherChronoFieldinstances will throw anUnsupportedTemporalTypeException.If the field is not a
ChronoField, then the result of this method is obtained by invokingTemporalField.rangeRefinedBy(TemporalAccessor)passingthisas the argument. Whether the range can be obtained is determined by the field.The range of valid Japanese eras can change over time due to the nature of the Japanese calendar system.
- Specified by:
rangein interfaceEra- Specified by:
rangein interfaceTemporalAccessor- Parameters:
field- the field to query the range for, not null- Returns:
- the range of valid values for the field, not null
- Throws:
DateTimeException- if the range for the field cannot be obtainedUnsupportedTemporalTypeException- if the unit is not supported
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