IsoEra

java.lang.Object
- java.lang.Enum<IsoEra>
- - java.time.chrono.IsoEra

All Implemented Interfaces:

Serializable, Comparable<IsoEra>, Era, TemporalAccessor, TemporalAdjuster
```
public enum IsoEra
extends Enum<IsoEra>
implements Era
```
An era in the ISO calendar system.
The ISO-8601 standard does not define eras. A definition has therefore been created with two eras - 'Current era' (CE) for years on or after 0001-01-01 (ISO), and 'Before current era' (BCE) for years before that.

year-of-era era proleptic-year

2 CE 2

1 CE 1

1 BCE 0

2 BCE -1

Do not use ordinal() to obtain the numeric representation of IsoEra. Use getValue() instead.
This is an immutable and thread-safe enum.

year-of-era	era	proleptic-year
2	CE	2
1	CE	1
1	BCE	0
2	BCE	-1

Enum Constant Summary

Enum Constants
Enum Constant and Description
`BCE` The singleton instance for the era before the current one, 'Before Current Era', which has the numeric value 0.
`CE` The singleton instance for the current era, 'Current Era', which has the numeric value 1.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Temporal`	`adjustInto(Temporal temporal)` Adjusts the specified temporal object to have the same era as this object.
`int`	`get(TemporalField field)` Gets the value of the specified field from this era as an `int`.
`long`	`getLong(TemporalField field)` Gets the value of the specified field from this era as a `long`.
`int`	`getValue()` Gets the numeric era `int` value.
`boolean`	`isSupported(TemporalField field)` Checks if the specified field is supported.
`static IsoEra`	`of(int isoEra)` Obtains an instance of `IsoEra` from an `int` value.
`<R> R`	`query(TemporalQuery<R> query)` Queries this era using the specified query.
`ValueRange`	`range(TemporalField field)` Gets the range of valid values for the specified field.
`static IsoEra`	`valueOf(String name)` Returns the enum constant of this type with the specified name.
`static IsoEra[]`	`values()` Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum
compareTo, equals, hashCode, name, ordinal, toString, valueOf

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

- Enum Constant Detail
  - BCE
```
public static final IsoEra BCE
```
    The singleton instance for the era before the current one, 'Before Current Era', which has the numeric value 0.
  - CE
```
public static final IsoEra CE
```
    The singleton instance for the current era, 'Current Era', which has the numeric value 1.
- Method Detail
  - adjustInto
```
public Temporal adjustInto(Temporal temporal)
```
    Adjusts the specified temporal object to have the same era as this object.
    This returns a temporal object of the same observable type as the input with the era changed to be the same as this.
    The adjustment is equivalent to using Temporal.with(TemporalField, long) passing ChronoField.ERA as the field.
    In most cases, it is clearer to reverse the calling pattern by using Temporal.with(TemporalAdjuster):
```
   // these two lines are equivalent, but the second approach is recommended
   temporal = thisEra.adjustInto(temporal);
   temporal = temporal.with(thisEra);
 
```
    This instance is immutable and unaffected by this method call.
    Specified by:
    
    adjustInto in interface Era
    
    Specified by:
    
    adjustInto in interface TemporalAdjuster
    
    Parameters:
    
    temporal - the target object to be adjusted, not null
    
    Returns:
    
    the adjusted object, not null
    
    Throws:
    
    DateTimeException - if unable to make the adjustment
  - get
```
public int get(TemporalField field)
```
    Gets the value of the specified field from this era as an int.
    This queries this era for the value of the specified field. The returned value will always be within the valid range of values for the field. If it is not possible to return the value, 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 value of the era. 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.getFrom(TemporalAccessor) passing this as the argument. Whether the value can be obtained, and what the value represents, is determined by the field.
    
    Specified by:
    
    get in interface Era
    
    Specified by:
    
    get in interface TemporalAccessor
    
    Parameters:
    
    field - the field to get, not null
    
    Returns:
    
    the value for the field
    
    Throws:
    
    DateTimeException - if a value for the field cannot be obtained or the value is outside the range of valid values for the field
    
    UnsupportedTemporalTypeException - if the field is not supported or the range of values exceeds an int
  - getLong
```
public long getLong(TemporalField field)
```
    Gets the value of the specified field from this era as a long.
    This queries this era for the value of the specified field. If it is not possible to return the value, 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 value of the era. 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.getFrom(TemporalAccessor) passing this as the argument. Whether the value can be obtained, and what the value represents, is determined by the field.
    
    Specified by:
    
    getLong in interface Era
    
    Specified by:
    
    getLong in interface TemporalAccessor
    
    Parameters:
    
    field - the field to get, not null
    
    Returns:
    
    the value for the field
    
    Throws:
    
    DateTimeException - if a value for the field cannot be obtained
    
    UnsupportedTemporalTypeException - if the field is not supported
  - getValue
```
public int getValue()
```
    Gets the numeric era int value.
    The era BCE has the value 0, while the era CE has the value 1.
    
    Specified by:
    
    getValue in interface Era
    
    Returns:
    
    the era value, from 0 (BCE) to 1 (CE)
  - isSupported
```
public boolean isSupported(@Nullable
                           TemporalField field)
```
    Checks if the specified field is supported.
    This checks if this era can be queried for the specified field. If false, then calling the range and get methods will throw an exception.
    If the field is a ChronoField then the query is implemented here. The ERA field returns true. All other ChronoField instances will return false.
    If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.isSupportedBy(TemporalAccessor) passing this as the argument. Whether the field is supported is determined by the field.
    
    Specified by:
    
    isSupported in interface Era
    
    Specified by:
    
    isSupported in interface TemporalAccessor
    
    Parameters:
    
    field - the field to check, null returns false
    
    Returns:
    
    true if the field is supported on this era, false if not
  - of
```
public static IsoEra of(int isoEra)
```
    Obtains an instance of IsoEra from an int value.
    IsoEra is an enum representing the ISO eras of BCE/CE. This factory allows the enum to be obtained from the int value.
    
    Parameters:
    
    isoEra - the BCE/CE value to represent, from 0 (BCE) to 1 (CE)
    
    Returns:
    
    the era singleton, not null
    
    Throws:
    
    DateTimeException - if the value is invalid
  - query
```
@Nullable
public <R> R query(TemporalQuery<R> query)
```
    Queries this era using the specified query.
    This queries this era using the specified query strategy object. The TemporalQuery object defines the logic to be used to obtain the result. Read the documentation of the query to understand what the result of this method will be.
    The result of this method is obtained by invoking the TemporalQuery.queryFrom(TemporalAccessor) method on the specified query passing this as the argument.
    
    Specified by:
    
    query in interface TemporalAccessor
    
    Type Parameters:
    
    R - the type of the result
    
    Parameters:
    
    query - the query to invoke, not null
    
    Returns:
    
    the query result, null may be returned (defined by the query)
    
    Throws:
    
    DateTimeException - if unable to query (defined by the query)
  - 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 default implementation must return a range for ERA from zero to one, suitable for two era calendar systems such as ISO.
    
    Specified by:
    
    range in interface Era
    
    Specified by:
    
    range in interface TemporalAccessor
    
    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 obtained
    
    UnsupportedTemporalTypeException - if the unit is not supported
  - valueOf
```
public static IsoEra valueOf(String name)
```
    Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
    
    Parameters:
    
    name - the name of the enum constant to be returned.
    
    Returns:
    
    the enum constant with the specified name
    
    Throws:
    
    IllegalArgumentException - if this enum type has no constant with the specified name
    
    NullPointerException - if the argument is null
  - values
```
public static IsoEra[] values()
```
    Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
```
for (IsoEra c : IsoEra.values())
    System.out.println(c);
```
    Returns:
    
    an array containing the constants of this enum type, in the order they are declared

Enum IsoEra

Enum Constant Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

BCE

CE

Method Detail

adjustInto

get

getLong

getValue

isSupported

of

query

range

valueOf

values