public final class JapaneseEra extends Object implements Era, Serializable
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
methods may be used to obtain a singleton instance of JapaneseEra for each
values() method returns the singleton instances of all
For convenience, this class declares a number of public static final fields that refer to singleton instances returned by the values() method.
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.
|Modifier and Type||Field and Description|
The singleton instance for the 'Heisei' era (1989-01-08 - 2019-04-30) which has the value 2.
The singleton instance for the 'Meiji' era (1868-01-01 - 1912-07-29) which has the value -1.
The singleton instance for the 'Showa' era (1926-12-25 - 1989-01-07) which has the value 1.
The singleton instance for the 'Taisho' era (1912-07-30 - 1926-12-24) which has the value 0.
|Modifier and Type||Method and Description|
Gets the textual representation of this era.
Gets the numeric era
Obtains an instance of
Gets the range of valid values for the specified field.
Returns a string representation of the object.
Returns an array of JapaneseEras.
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
public static final JapaneseEra MEIJI
public static final JapaneseEra TAISHO
public static final JapaneseEra SHOWA
public static final JapaneseEra HEISEI
public static JapaneseEra of(int japaneseEra)
1is associated with the 'Showa' era, because it contains 1970-01-01 (ISO calendar system).
0are associated with two earlier eras, Meiji and Taisho, respectively.
1is associated with a later era, beginning with Heisei (
japaneseEra- the era to represent
JapaneseErasingleton, not null
DateTimeException- if the value is invalid
public static JapaneseEra valueOf(String japaneseEra)
JapaneseErawith the name.
The string must match exactly the name of the era. (Extraneous whitespace characters are not permitted.)
japaneseEra- the japaneseEra name; non-null
JapaneseErasingleton, never null
IllegalArgumentException- if there is not JapaneseEra with the specified name
public static JapaneseEra values()
This method may be used to iterate over the JapaneseEras as follows:
for (JapaneseEra c : JapaneseEra.values()) System.out.println(c);
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.
public int getValue()
public ValueRange range(TemporalField 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.
ERA field returns the range.
ChronoField instances will throw an
If the field is not a
ChronoField, then the result of this method
is obtained by invoking
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.
field- the field to query the range for, not null
DateTimeException- if the range for the field cannot be obtained
UnsupportedTemporalTypeException- if the unit is not supported
public String toString()
toStringmethod returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.
toString method for class
returns a string consisting of the name of the class of which the
object is an instance, the at-sign character `
the unsigned hexadecimal representation of the hash code of the
object. In other words, this method returns a string equal to the
getClass().getName() + '@' + Integer.toHexString(hashCode())
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