Enum JulianEra

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<JulianEra>, java.time.chrono.Era, java.time.temporal.TemporalAccessor, java.time.temporal.TemporalAdjuster

    public enum JulianEra
    extends java.lang.Enum<JulianEra>
    implements java.time.chrono.Era
    An era in the Julian calendar system.

    The Julian calendar system has two eras. The current era, for years from 1 onwards, is known as 'Anno Domini'. All previous years, zero or earlier in the proleptic count or one and greater in the year-of-era count, are part of the 'Before Christ' era.

    The start of the Julian epoch 0001-01-01 (Julian) is 0000-12-30 (ISO).

    Do not use ordinal() to obtain the numeric representation of JulianEra. Use getValue() instead.

    Implementation Requirements:

    This is an immutable and thread-safe enum.
    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      AD
      The singleton instance for the current era, 'Anno Domini', which has the numeric value 1.
      BC
      The singleton instance for the era before the current one, 'Before Christ', which has the numeric value 0.
    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int getValue()
      Gets the numeric era int value.
      static JulianEra of​(int era)
      Obtains an instance of JulianEra from an int value.
      static JulianEra valueOf​(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static JulianEra[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.
      • Methods inherited from class java.lang.Enum

        clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait
      • Methods inherited from interface java.time.chrono.Era

        adjustInto, get, getDisplayName, getLong, isSupported, query, range
    • Enum Constant Detail

      • BC

        public static final JulianEra BC
        The singleton instance for the era before the current one, 'Before Christ', which has the numeric value 0.
      • AD

        public static final JulianEra AD
        The singleton instance for the current era, 'Anno Domini', which has the numeric value 1.
    • Method Detail

      • values

        public static JulianEra[] 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 (JulianEra c : JulianEra.values())
            System.out.println(c);
        
        Returns:
        an array containing the constants of this enum type, in the order they are declared
      • valueOf

        public static JulianEra valueOf​(java.lang.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:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null
      • of

        public static JulianEra of​(int era)
        Obtains an instance of JulianEra from an int value.

        JulianEra is an enum representing the Julian eras of BC/AD. This factory allows the enum to be obtained from the int value.

        Parameters:
        era - the BC/AD value to represent, from 0 (BC) to 1 (AD)
        Returns:
        the era singleton, not null
        Throws:
        java.time.DateTimeException - if the value is invalid
      • getValue

        public int getValue()
        Gets the numeric era int value.

        The era BC has the value 0, while the era AD has the value 1.

        Specified by:
        getValue in interface java.time.chrono.Era
        Returns:
        the era value, from 0 (BC) to 1 (AD)