java.lang.Object
- org.threeten.bp.jdk8.DefaultInterfaceTemporalAccessor
- - org.threeten.bp.jdk8.DefaultInterfaceEra
  - - org.threeten.bp.chrono.JapaneseEra

All Implemented Interfaces:

java.io.Serializable, Era, TemporalAccessor, TemporalAdjuster
```
public final class JapaneseEra
extends DefaultInterfaceEra
implements java.io.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

Field Summary

Fields
Modifier and Type	Field	Description
`private static int`	`ADDITIONAL_VALUE`	The value of the additional era.
`(package private) static int`	`ERA_OFFSET`
`private int`	`eraValue`	The era value.
`static JapaneseEra`	`HEISEI`	The singleton instance for the 'Heisei' era (1989-01-08 - 2019-04-30) which has the value 2.
`private static java.util.concurrent.atomic.AtomicReference<JapaneseEra[]>`	`KNOWN_ERAS`
`static JapaneseEra`	`MEIJI`	The singleton instance for the 'Meiji' era (1868-09-08 - 1912-07-29) which has the value -1.
`private java.lang.String`	`name`
`static JapaneseEra`	`REIWA`	The singleton instance for the 'Reiwa' era (2019-05-01 - current) which has the value 3.
`private static long`	`serialVersionUID`	Serialization version.
`static JapaneseEra`	`SHOWA`	The singleton instance for the 'Showa' era (1926-12-25 - 1989-01-07) which has the value 1.
`private LocalDate`	`since`
`static JapaneseEra`	`TAISHO`	The singleton instance for the 'Taisho' era (1912-07-30 - 1926-12-24) which has the value 0.

Constructor Summary

Constructors
Modifier Constructor Description

private JapaneseEra(int eraValue, LocalDate since, java.lang.String name)
Creates an instance.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`(package private) LocalDate`	`endDate()`	Returns the end date of the era.
`(package private) static JapaneseEra`	`from(LocalDate date)`	Obtains an instance of `JapaneseEra` from a date.
`int`	`getValue()`	Returns the numeric value of this `JapaneseEra`.
`static JapaneseEra`	`of(int japaneseEra)`	Obtains an instance of `JapaneseEra` from an `int` value.
`private static int`	`ordinal(int eraValue)`	Returns the index into the arrays from the Era value.
`ValueRange`	`range(TemporalField field)`	Gets the range of valid values for the specified field.
`(package private) static JapaneseEra`	`readExternal(java.io.DataInput in)`
`private java.lang.Object`	`readResolve()`	Returns the singleton `JapaneseEra` corresponding to this object.
`static JapaneseEra`	`registerEra(LocalDate since, java.lang.String name)`	Registers an additional instance of `JapaneseEra`.
`(package private) LocalDate`	`startDate()`	Returns the start date of the era.
`java.lang.String`	`toString()`
`static JapaneseEra`	`valueOf(java.lang.String japaneseEra)`	Returns the `JapaneseEra` with the name.
`static JapaneseEra[]`	`values()`	Returns an array of JapaneseEras.
`(package private) void`	`writeExternal(java.io.DataOutput out)`
`private java.lang.Object`	`writeReplace()`

Methods inherited from class org.threeten.bp.jdk8.DefaultInterfaceEra
adjustInto, get, getDisplayName, getLong, isSupported, query

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

- Field Detail
  - ERA_OFFSET
```
static final int ERA_OFFSET
```
    See Also:
    
    Constant Field Values
  - MEIJI
```
public static final JapaneseEra MEIJI
```
    The singleton instance for the 'Meiji' era (1868-09-08 - 1912-07-29) which has the value -1.
  - TAISHO
```
public static final JapaneseEra TAISHO
```
    The singleton instance for the 'Taisho' era (1912-07-30 - 1926-12-24) which has the value 0.
  - SHOWA
```
public static final JapaneseEra SHOWA
```
    The singleton instance for the 'Showa' era (1926-12-25 - 1989-01-07) which has the value 1.
  - HEISEI
```
public static final JapaneseEra HEISEI
```
    The singleton instance for the 'Heisei' era (1989-01-08 - 2019-04-30) which has the value 2.
  - REIWA
```
public static final JapaneseEra REIWA
```
    The singleton instance for the 'Reiwa' era (2019-05-01 - current) which has the value 3.
  - ADDITIONAL_VALUE
```
private static final int ADDITIONAL_VALUE
```
    The value of the additional era.
    
    See Also:
    
    Constant Field Values
  - serialVersionUID
```
private static final long serialVersionUID
```
    Serialization version.
    
    See Also:
    
    Constant Field Values
  - KNOWN_ERAS
```
private static final java.util.concurrent.atomic.AtomicReference<JapaneseEra[]> KNOWN_ERAS
```
  - eraValue
```
private final int eraValue
```
    The era value.
  - since
```
private final transient LocalDate since
```
  - name
```
private final transient java.lang.String name
```
- Constructor Detail
  - JapaneseEra
```
private JapaneseEra(int eraValue,
                    LocalDate since,
                    java.lang.String name)
```
    Creates an instance.
    
    Parameters:
    
    eraValue - the era value, validated
    
    since - the date representing the first date of the era, validated not null
    
    name - the name
- Method Detail
  - readResolve
```
private java.lang.Object readResolve()
                              throws java.io.ObjectStreamException
```
    Returns the singleton JapaneseEra corresponding to this object. It's possible that this version of JapaneseEra doesn't support the latest era value. In that case, this method throws an ObjectStreamException.
    
    Returns:
    
    the singleton JapaneseEra for this object
    
    Throws:
    
    java.io.ObjectStreamException - if the deserialized object has any unknown numeric era value.
  - registerEra
```
public static JapaneseEra registerEra(LocalDate since,
                                      java.lang.String name)
```
    Registers an additional instance of JapaneseEra.
    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 null
    
    name - the name
    
    Returns:
    
    the JapaneseEra singleton, not null
    
    Throws:
    
    DateTimeException - if an additional era has already been registered
  - of
```
public static JapaneseEra of(int japaneseEra)
```
    Obtains an instance of JapaneseEra from an int 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
  - valueOf
```
public static JapaneseEra valueOf(java.lang.String japaneseEra)
```
    Returns the JapaneseEra 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:
    
    java.lang.IllegalArgumentException - if there is not JapaneseEra with the specified name
  - 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
  - from
```
static JapaneseEra from(LocalDate date)
```
    Obtains an instance of JapaneseEra from a date.
    
    Parameters:
    
    date - the date, not null
    
    Returns:
    
    the Era singleton, never null
  - ordinal
```
private static int ordinal(int eraValue)
```
    Returns the index into the arrays from the Era value. the eraValue is a valid Era number, -999, -1..2.
    
    Parameters:
    
    eraValue - the era value to convert to the index
    
    Returns:
    
    the index of the current Era
  - startDate
```
LocalDate startDate()
```
    Returns the start date of the era.
    
    Returns:
    
    the start date
  - endDate
```
LocalDate endDate()
```
    Returns the end date of the era.
    
    Returns:
    
    the end date
  - getValue
```
public int getValue()
```
    Returns the numeric value of this JapaneseEra.
    The SHOWA era that contains 1970-01-01 (ISO calendar system) has the value 1. Later eras are numbered from 2 (HEISEI). Earlier eras are numbered 0 (TAISHO) and -1 (MEIJI).
    
    Specified by:
    
    getValue in interface Era
    
    Returns:
    
    the era value
  - 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 in ChronoField. If the field is supported, then the range of the field must be returned. If unsupported, then a DateTimeException must be thrown.
    If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.rangeRefinedBy(TemporalAccessorl) passing this as the argument.
    Implementations must not alter either this object.
    
    Specified by:
    
    range in interface TemporalAccessor
    
    Overrides:
    
    range in class DefaultInterfaceTemporalAccessor
    
    Parameters:
    
    field - the field to query the range for, not null
    
    Returns:
    
    the range of valid values for the field, not null
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object
  - writeReplace
```
private java.lang.Object writeReplace()
```
  - writeExternal
```
void writeExternal(java.io.DataOutput out)
            throws java.io.IOException
```
    Throws:
    
    java.io.IOException
  - readExternal
```
static JapaneseEra readExternal(java.io.DataInput in)
                         throws java.io.IOException
```
    Throws:
    
    java.io.IOException

Class JapaneseEra

Specification for implementors

Field Summary

Constructor Summary

Method Summary

Methods inherited from class org.threeten.bp.jdk8.DefaultInterfaceEra

Methods inherited from class java.lang.Object

Field Detail

ERA_OFFSET

MEIJI

TAISHO

SHOWA

HEISEI

REIWA

ADDITIONAL_VALUE

serialVersionUID

KNOWN_ERAS

eraValue

since

name

Constructor Detail

JapaneseEra

Method Detail

readResolve

registerEra

of

valueOf

values

from

ordinal

startDate

endDate

getValue

range

Specification for implementors

toString

writeReplace

writeExternal

readExternal