Class JapaneseEra
- java.lang.Object
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- org.threeten.bp.jdk8.DefaultInterfaceTemporalAccessor
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- org.threeten.bp.jdk8.DefaultInterfaceEra
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- org.threeten.bp.chrono.JapaneseEra
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- All Implemented Interfaces:
Serializable
,Era
,TemporalAccessor
,TemporalAdjuster
public final class JapaneseEra extends DefaultInterfaceEra implements Serializable
An era in the Japanese Imperial calendar system.This class defines the valid eras for the Japanese chronology. Japan introduced the Gregorian calendar starting with Meiji 6. Only Meiji and later eras are supported; dates before Meiji 6, January 1 are not supported.
The four supported eras are hard-coded. A single additional era may be registered using
registerEra(LocalDate, String)
.Specification for implementors
This class is immutable and thread-safe.- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description static JapaneseEra
HEISEI
The singleton instance for the 'Heisei' era (1989-01-08 - 2019-04-30) which has the value 2.static JapaneseEra
MEIJI
The singleton instance for the 'Meiji' era (1868-09-08 - 1912-07-29) which has the value -1.static JapaneseEra
REIWA
The singleton instance for the 'Reiwa' era (2019-05-01 - current) which has the value 3.static JapaneseEra
SHOWA
The singleton instance for the 'Showa' era (1926-12-25 - 1989-01-07) which has the value 1.static JapaneseEra
TAISHO
The singleton instance for the 'Taisho' era (1912-07-30 - 1926-12-24) which has the value 0.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description int
getValue()
Returns the numeric value of thisJapaneseEra
.static JapaneseEra
of(int japaneseEra)
Obtains an instance ofJapaneseEra
from anint
value.ValueRange
range(TemporalField field)
Gets the range of valid values for the specified field.static JapaneseEra
registerEra(LocalDate since, String name)
Registers an additional instance ofJapaneseEra
.String
toString()
static JapaneseEra
valueOf(String japaneseEra)
Returns theJapaneseEra
with the name.static JapaneseEra[]
values()
Returns an array of JapaneseEras.-
Methods inherited from class org.threeten.bp.jdk8.DefaultInterfaceEra
adjustInto, get, getDisplayName, getLong, isSupported, query
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Field Detail
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MEIJI
public static final JapaneseEra MEIJI
The singleton instance for the 'Meiji' era (1868-09-08 - 1912-07-29) which has the value -1.
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TAISHO
public static final JapaneseEra TAISHO
The singleton instance for the 'Taisho' era (1912-07-30 - 1926-12-24) which has the value 0.
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SHOWA
public static final JapaneseEra SHOWA
The singleton instance for the 'Showa' era (1926-12-25 - 1989-01-07) which has the value 1.
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HEISEI
public static final JapaneseEra HEISEI
The singleton instance for the 'Heisei' era (1989-01-08 - 2019-04-30) which has the value 2.
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REIWA
public static final JapaneseEra REIWA
The singleton instance for the 'Reiwa' era (2019-05-01 - current) which has the value 3.
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Method Detail
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registerEra
public static JapaneseEra registerEra(LocalDate since, String name)
Registers an additional instance ofJapaneseEra
.A new Japanese era can begin at any time. This method allows one new era to be registered without the need for a new library version. If needed, callers should assign the result to a static variable accessible across the application. This must be done once, in early startup code.
NOTE: This method does not exist in Java SE 8.
- Parameters:
since
- the date representing the first date of the era, validated not nullname
- the name- Returns:
- the
JapaneseEra
singleton, not null - Throws:
DateTimeException
- if an additional era has already been registered
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of
public static JapaneseEra of(int japaneseEra)
Obtains an instance ofJapaneseEra
from anint
value.The
SHOWA
era that contains 1970-01-01 (ISO calendar system) has the value 1 Later era is numbered 2 (HEISEI
). Earlier eras are numbered 0 (TAISHO
), -1 (MEIJI
), only Meiji and later eras are supported.- Parameters:
japaneseEra
- the era to represent- Returns:
- the
JapaneseEra
singleton, not null - Throws:
DateTimeException
- if the value is invalid
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valueOf
public static JapaneseEra valueOf(String japaneseEra)
Returns theJapaneseEra
with the name.The string must match exactly the name of the era. (Extraneous whitespace characters are not permitted.)
- Parameters:
japaneseEra
- the japaneseEra name; non-null- Returns:
- the
JapaneseEra
singleton, never null - Throws:
IllegalArgumentException
- if there is not JapaneseEra with the specified name
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values
public static JapaneseEra[] values()
Returns an array of JapaneseEras.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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getValue
public int getValue()
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range
public ValueRange range(TemporalField field)
Description copied from interface:TemporalAccessor
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. The value of this temporal object is used to enhance the accuracy of the returned range. If the date-time cannot return the range, because the field is unsupported or for some other reason, an exception will be thrown.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.
Specification for implementors
Implementations must check and handle all fields defined inChronoField
. If the field is supported, then the range of the field must be returned. If unsupported, then aDateTimeException
must be thrown.If the field is not a
ChronoField
, then the result of this method is obtained by invokingTemporalField.rangeRefinedBy(TemporalAccessorl)
passingthis
as the argument.Implementations must not alter either this object.
- Specified by:
range
in interfaceTemporalAccessor
- Overrides:
range
in classDefaultInterfaceTemporalAccessor
- Parameters:
field
- the field to query the range for, not null- Returns:
- the range of valid values for the field, not null
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