JapaneseEra
public
final
class
JapaneseEra
extends Object
implements
Era,
Serializable
java.lang.Object | |
↳ | java.time.chrono.JapaneseEra |
An era in the Japanese Imperial calendar system.
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(java.lang.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.
Summary
Fields | |
---|---|
public
static
final
JapaneseEra |
HEISEI
The singleton instance for the 'Heisei' era (1989-01-08 - 2019-04-30) which has the value 2. |
public
static
final
JapaneseEra |
MEIJI
The singleton instance for the 'Meiji' era (1868-01-01 - 1912-07-29) which has the value -1. |
public
static
final
JapaneseEra |
REIWA
The singleton instance for the 'Reiwa' era (2019-05-01 - ) which has the value 3. |
public
static
final
JapaneseEra |
SHOWA
The singleton instance for the 'Showa' era (1926-12-25 - 1989-01-07) which has the value 1. |
public
static
final
JapaneseEra |
TAISHO
The singleton instance for the 'Taisho' era (1912-07-30 - 1926-12-24) which has the value 0. |
Public methods | |
---|---|
String
|
getDisplayName(TextStyle style, Locale locale)
Gets the textual representation of this era. |
int
|
getValue()
Gets the numeric era |
static
JapaneseEra
|
of(int japaneseEra)
Obtains an instance of |
ValueRange
|
range(TemporalField field)
Gets the range of valid values for the specified field. |
String
|
toString()
Returns a string representation of the object. |
static
JapaneseEra
|
valueOf(String japaneseEra)
Returns the |
static
JapaneseEra[]
|
values()
Returns an array of JapaneseEras. |
Inherited methods | |
---|---|
Fields
HEISEI
public static final JapaneseEra HEISEI
The singleton instance for the 'Heisei' era (1989-01-08 - 2019-04-30) which has the value 2.
MEIJI
public static final JapaneseEra MEIJI
The singleton instance for the 'Meiji' era (1868-01-01 - 1912-07-29) which has the value -1.
REIWA
public static final JapaneseEra 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.
SHOWA
public static final JapaneseEra SHOWA
The singleton instance for the 'Showa' era (1926-12-25 - 1989-01-07) 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.
Public methods
getDisplayName
public String getDisplayName (TextStyle style, Locale locale)
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 value
is returned.
Parameters | |
---|---|
style |
TextStyle : |
locale |
Locale : |
Returns | |
---|---|
String |
the text value of the era, not null |
getValue
public int getValue ()
Gets the numeric era int
value.
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
), -1 (MEIJI
)).
Returns | |
---|---|
int |
the era value |
of
public static JapaneseEra of (int japaneseEra)
Obtains an instance of JapaneseEra
from an int
value.
- The value
1
is associated with the 'Showa' era, because it contains 1970-01-01 (ISO calendar system). - The values
-1
and0
are associated with two earlier eras, Meiji and Taisho, respectively. - A value greater than
1
is associated with a later era, beginning with Heisei (2
).
Every instance of JapaneseEra
that is returned from the values()
method has an int value (available via Era#getValue()
which is
accepted by this method.
Parameters | |
---|---|
japaneseEra |
int : the era to represent |
Returns | |
---|---|
JapaneseEra |
the JapaneseEra singleton, not null |
Throws | |
---|---|
DateTimeException |
if the value is invalid |
range
public ValueRange range (TemporalField field)
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 ChronoField
then the query is implemented here.
The ERA
field returns the range.
All other ChronoField
instances will throw an UnsupportedTemporalTypeException
.
If the field is not a ChronoField
, then the result of this method
is obtained by invoking TemporalField.rangeRefinedBy(TemporalAccessor)
passing this
as 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.
Parameters | |
---|---|
field |
TemporalField : the field to query the range for, not null |
Returns | |
---|---|
ValueRange |
the range of valid values for the field, not null |
Throws | |
---|---|
DateTimeException |
if the range for the field cannot be obtained |
UnsupportedTemporalTypeException |
if the unit is not supported |
toString
public String toString ()
Returns a string representation of the object.
Returns | |
---|---|
String |
a string representation of the object. |
valueOf
public static JapaneseEra valueOf (String japaneseEra)
Returns the JapaneseEra
with 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 |
String : the japaneseEra name; non-null |
Returns | |
---|---|
JapaneseEra |
the JapaneseEra singleton, never null |
Throws | |
---|---|
IllegalArgumentException |
if there is not JapaneseEra with the specified name |
values
public static JapaneseEra[] 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 | |
---|---|
JapaneseEra[] |
an array of JapaneseEras |