Class/Object

java.time

Year

Related Docs: object Year | package time

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final class Year extends TemporalAccessor with Temporal with TemporalAdjuster with Ordered[Year] with Serializable

A year in the ISO-8601 calendar system, such as 2007.

Year is an immutable date-time object that represents a year. Any field that can be derived from a year can be obtained.

Note that years in the ISO chronology only align with years in the Gregorian-Julian system for modern years. Parts of Russia did not switch to the modern Gregorian/ISO rules until 1920. As such, historical years must be treated with caution.

This class does not store or represent a month, day, time or time-zone. For example, the value "2007" can be stored in a Year.

Years represented by this class follow the ISO-8601 standard and use the proleptic numbering system. Year 1 is preceded by year 0, then by year -1.

The ISO-8601 calendar system is the modern civil calendar system used today in most of the world. It is equivalent to the proleptic Gregorian calendar system, in which today's rules for leap years are applied for all time. For most applications written today, the ISO-8601 rules are entirely suitable. However, any application that makes use of historical dates, and requires them to be accurate will find the ISO-8601 approach unsuitable.

Specification for implementors

This class is immutable and thread-safe.

Annotations
@SerialVersionUID()
Linear Supertypes
Serializable, Ordered[Year], Comparable[Year], TemporalAdjuster, Temporal, TemporalAccessor, AnyRef, Any
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Inherited
  1. Year
  2. Serializable
  3. Ordered
  4. Comparable
  5. TemporalAdjuster
  6. Temporal
  7. TemporalAccessor
  8. AnyRef
  9. Any
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Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any
  3. def <(that: Year): Boolean

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    Definition Classes
    Ordered
  4. def <=(that: Year): Boolean

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    Definition Classes
    Ordered
  5. final def ==(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  6. def >(that: Year): Boolean

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    Definition Classes
    Ordered
  7. def >=(that: Year): Boolean

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    Definition Classes
    Ordered
  8. def adjustInto(temporal: Temporal): Temporal

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    Adjusts the specified temporal object to have this year.

    Adjusts the specified temporal object to have this year.

    This returns a temporal object of the same observable type as the input with the year changed to be the same as this.

    The adjustment is equivalent to using long) passing ChronoField#YEAR as the field. If the specified temporal object does not use the ISO calendar system then a DateTimeException is thrown.

    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 = thisYear.adjustInto(temporal);
    temporal = temporal.with(thisYear);
    

    This instance is immutable and unaffected by this method call.

    temporal

    the target object to be adjusted, not null

    returns

    the adjusted object, not null

    Definition Classes
    YearTemporalAdjuster
    Exceptions thrown

    ArithmeticException if numeric overflow occurs

    DateTimeException if unable to make the adjustment

  9. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any
  10. def atDay(dayOfYear: Int): LocalDate

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    Combines this year with a day-of-year to create a LocalDate.

    Combines this year with a day-of-year to create a LocalDate.

    This returns a LocalDate formed from this year and the specified day-of-year.

    The day-of-year value 366 is only valid in a leap year.

    dayOfYear

    the day-of-year to use, not null

    returns

    the local date formed from this year and the specified date of year, not null

    Exceptions thrown

    DateTimeException if the day of year is zero or less, 366 or greater or equal to 366 and this is not a leap year

  11. def atMonth(month: Int): YearMonth

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    Combines this year with a month to create a YearMonth.

    Combines this year with a month to create a YearMonth.

    This returns a YearMonth formed from this year and the specified month. All possible combinations of year and month are valid.

    This method can be used as part of a chain to produce a date:

    LocalDate date = year.atMonth(month).atDay(day);
    

    month

    the month-of-year to use, from 1 (January) to 12 (December)

    returns

    the year-month formed from this year and the specified month, not null

    Exceptions thrown

    DateTimeException if the month is invalid

  12. def atMonth(month: Month): YearMonth

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    Combines this year with a month to create a YearMonth.

    Combines this year with a month to create a YearMonth.

    This returns a YearMonth formed from this year and the specified month. All possible combinations of year and month are valid.

    This method can be used as part of a chain to produce a date:

    LocalDate date = year.atMonth(month).atDay(day);
    

    month

    the month-of-year to use, not null

    returns

    the year-month formed from this year and the specified month, not null

  13. def atMonthDay(monthDay: MonthDay): LocalDate

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    Combines this year with a month-day to create a LocalDate.

    Combines this year with a month-day to create a LocalDate.

    This returns a LocalDate formed from this year and the specified month-day.

    A month-day of February 29th will be adjusted to February 28th in the resulting date if the year is not a leap year.

    monthDay

    the month-day to use, not null

    returns

    the local date formed from this year and the specified month-day, not null

  14. def clone(): AnyRef

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  15. def compare(other: Year): Int

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    Compares this year to another year.

    Compares this year to another year.

    The comparison is based on the value of the year. It is "consistent with equals", as defined by Comparable.

    other

    the other year to compare to, not null

    returns

    the comparator value, negative if less, positive if greater

    Definition Classes
    Year → Ordered
  16. def compareTo(other: Year): Int

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    Definition Classes
    Year → Ordered → Comparable
  17. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  18. def equals(obj: Any): Boolean

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    Checks if this year is equal to another year.

    Checks if this year is equal to another year.

    The comparison is based on the time-line position of the years.

    obj

    the object to check, null returns false

    returns

    true if this is equal to the other year

    Definition Classes
    Year → AnyRef → Any
  19. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  20. def format(formatter: DateTimeFormatter): String

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    Outputs this year as a String using the formatter.

    Outputs this year as a String using the formatter.

    This year will be passed to the formatter print method.

    formatter

    the formatter to use, not null

    returns

    the formatted year string, not null

    Exceptions thrown

    DateTimeException if an error occurs during printing

  21. def get(field: TemporalField): Int

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    Gets the value of the specified field from this year as an int.

    Gets the value of the specified field from this year as an int.

    This queries this year for the value for 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 supported fields will return valid values based on this year. All other ChronoField instances will throw a DateTimeException.

    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.

    field

    the field to get, not null

    returns

    the value for the field

    Definition Classes
    YearTemporalAccessor
    Exceptions thrown

    ArithmeticException if numeric overflow occurs

    DateTimeException if a value for the field cannot be obtained

  22. final def getClass(): Class[_]

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    Definition Classes
    AnyRef → Any
  23. def getLong(field: TemporalField): Long

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    Gets the value of the specified field from this year as a long.

    Gets the value of the specified field from this year as a long.

    This queries this year for the value for 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 supported fields will return valid values based on this year. All other ChronoField instances will throw a DateTimeException.

    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.

    field

    the field to get, not null

    returns

    the value for the field

    Definition Classes
    YearTemporalAccessor
    Exceptions thrown

    ArithmeticException if numeric overflow occurs

    DateTimeException if a value for the field cannot be obtained

  24. def getValue: Int

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    Gets the year value.

    Gets the year value.

    The year returned by this method is proleptic as per get(YEAR).

    returns

    the year, { @code MIN_VALUE} to { @code MAX_VALUE}

  25. def hashCode(): Int

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    A hash code for this year.

    A hash code for this year.

    returns

    a suitable hash code

    Definition Classes
    Year → AnyRef → Any
  26. def isAfter(other: Year): Boolean

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    Is this year after the specified year.

    Is this year after the specified year.

    other

    the other year to compare to, not null

    returns

    true if this is after the specified year

  27. def isBefore(other: Year): Boolean

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    Is this year before the specified year.

    Is this year before the specified year.

    other

    the other year to compare to, not null

    returns

    true if this point is before the specified year

  28. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any
  29. def isLeap: Boolean

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    Checks if the year is a leap year, according to the ISO proleptic calendar system rules.

    Checks if the year is a leap year, according to the ISO proleptic calendar system rules.

    This method applies the current rules for leap years across the whole time-line. In general, a year is a leap year if it is divisible by four without remainder. However, years divisible by 100, are not leap years, with the exception of years divisible by 400 which are.

    For example, 1904 is a leap year it is divisible by 4. 1900 was not a leap year as it is divisible by 100, however 2000 was a leap year as it is divisible by 400.

    The calculation is proleptic - applying the same rules into the far future and far past. This is historically inaccurate, but is correct for the ISO-8601 standard.

    returns

    true if the year is leap, false otherwise

  30. def isSupported(unit: TemporalUnit): Boolean

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    Checks if the specified unit is supported.

    Checks if the specified unit is supported.

    This checks if the date-time can be queried for the specified unit. If false, then calling the plus and minus methods will throw an exception.

    Specification for implementors

    Implementations must check and handle all fields defined in ChronoUnit. If the field is supported, then true is returned, otherwise false

    If the field is not a ChronoUnit, then the result of this method is obtained by invoking TemporalUnit.isSupportedBy(Temporal) passing this as the argument.

    Implementations must not alter this object.

    unit

    the unit to check, null returns false

    returns

    true if this date-time can be queried for the unit, false if not

    Definition Classes
    YearTemporal
  31. def isSupported(field: TemporalField): Boolean

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    Checks if the specified field is supported.

    Checks if the specified field is supported.

    This checks if this year 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 supported fields will return valid values based on this date-time. The supported fields are:

    • YEAR_OF_ERA
    • YEAR
    • ERA

    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.

    field

    the field to check, null returns false

    returns

    true if the field is supported on this year, false if not

    Definition Classes
    YearTemporalAccessor
  32. def isValidMonthDay(monthDay: MonthDay): Boolean

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    Checks if the month-day is valid for this year.

    Checks if the month-day is valid for this year.

    This method checks whether this year and the input month and day form a valid date.

    monthDay

    the month-day to validate, null returns false

    returns

    true if the month and day are valid for this year

  33. def length: Int

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    Gets the length of this year in days.

    Gets the length of this year in days.

    returns

    the length of this year in days, 365 or 366

  34. def minus(amountToSubtract: Long, unit: TemporalUnit): Year

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    Returns an object of the same type as this object with the specified period subtracted.

    Returns an object of the same type as this object with the specified period subtracted.

    This method returns a new object based on this one with the specified period subtracted. For example, on a LocalDate, this could be used to subtract a number of years, months or days. The returned object will have the same observable type as this object.

    In some cases, changing a field is not fully defined. For example, if the target object is a date representing the 31st March, then subtracting one month would be unclear. In cases like this, the field is responsible for resolving the result. Typically it will choose the previous valid date, which would be the last valid day of February in this example.

    If the implementation represents a date-time that has boundaries, such as LocalTime, then the permitted units must include the boundary unit, but no multiples of the boundary unit. For example, LocalTime must accept DAYS but not WEEKS or MONTHS.

    Specification for implementors

    Implementations must behave in a manor equivalent to the default method behavior.

    Implementations must not alter either this object or the specified temporal object. Instead, an adjusted copy of the original must be returned. This provides equivalent, safe behavior for immutable and mutable implementations.

    amountToSubtract

    the amount of the specified unit to subtract, may be negative

    unit

    the unit of the period to subtract, not null

    returns

    an object of the same type with the specified period subtracted, not null

    Definition Classes
    YearTemporal
    Exceptions thrown

    ArithmeticException { @inheritDoc}

    DateTimeException { @inheritDoc}

  35. def minus(amount: TemporalAmount): Year

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    Returns a copy of this year with the specified period subtracted.

    Returns a copy of this year with the specified period subtracted.

    This method returns a new year based on this year with the specified period subtracted. The subtractor is typically Period but may be any other type implementing the TemporalAmount interface. The calculation is delegated to the specified adjuster, which typically calls back to TemporalUnit).

    This instance is immutable and unaffected by this method call.

    amount

    the amount to subtract, not null

    returns

    a { @code Year} based on this year with the subtraction made, not null

    Definition Classes
    YearTemporal
    Exceptions thrown

    ArithmeticException if numeric overflow occurs

    DateTimeException if the subtraction cannot be made

  36. def minusYears(yearsToSubtract: Long): Year

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    Returns a copy of this year with the specified number of years subtracted.

    Returns a copy of this year with the specified number of years subtracted.

    This instance is immutable and unaffected by this method call.

    yearsToSubtract

    the years to subtract, may be negative

    returns

    a { @code Year} based on this year with the period subtracted, not null

    Exceptions thrown

    DateTimeException if the result exceeds the supported year range

  37. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  38. final def notify(): Unit

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    Definition Classes
    AnyRef
  39. final def notifyAll(): Unit

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    Definition Classes
    AnyRef
  40. def plus(amountToAdd: Long, unit: TemporalUnit): Year

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    Returns an object of the same type as this object with the specified period added.

    Returns an object of the same type as this object with the specified period added.

    This method returns a new object based on this one with the specified period added. For example, on a LocalDate, this could be used to add a number of years, months or days. The returned object will have the same observable type as this object.

    In some cases, changing a field is not fully defined. For example, if the target object is a date representing the 31st January, then adding one month would be unclear. In cases like this, the field is responsible for resolving the result. Typically it will choose the previous valid date, which would be the last valid day of February in this example.

    If the implementation represents a date-time that has boundaries, such as LocalTime, then the permitted units must include the boundary unit, but no multiples of the boundary unit. For example, LocalTime must accept DAYS but not WEEKS or MONTHS.

    Specification for implementors

    Implementations must check and handle all units defined in ChronoUnit. If the unit is supported, then the addition must be performed. If unsupported, then a DateTimeException must be thrown.

    If the unit is not a ChronoUnit, then the result of this method is obtained by invoking TemporalUnit.addTo(Temporal, long) passing this as the first argument.

    Implementations must not alter either this object or the specified temporal object. Instead, an adjusted copy of the original must be returned. This provides equivalent, safe behavior for immutable and mutable implementations.

    amountToAdd

    the amount of the specified unit to add, may be negative

    unit

    the unit of the period to add, not null

    returns

    an object of the same type with the specified period added, not null

    Definition Classes
    YearTemporal
    Exceptions thrown

    ArithmeticException { @inheritDoc}

    DateTimeException { @inheritDoc}

  41. def plus(amount: TemporalAmount): Year

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    Returns a copy of this year with the specified period added.

    Returns a copy of this year with the specified period added.

    This method returns a new year based on this year with the specified period added. The adder is typically Period but may be any other type implementing the TemporalAmount interface. The calculation is delegated to the specified adjuster, which typically calls back to TemporalUnit).

    This instance is immutable and unaffected by this method call.

    amount

    the amount to add, not null

    returns

    a { @code Year} based on this year with the addition made, not null

    Definition Classes
    YearTemporal
    Exceptions thrown

    ArithmeticException if numeric overflow occurs

    DateTimeException if the addition cannot be made

  42. def plusYears(yearsToAdd: Long): Year

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    Returns a copy of this year with the specified number of years added.

    Returns a copy of this year with the specified number of years added.

    This instance is immutable and unaffected by this method call.

    yearsToAdd

    the years to add, may be negative

    returns

    a { @code Year} based on this year with the period added, not null

    Exceptions thrown

    DateTimeException if the result exceeds the supported year range

  43. def query[R](query: TemporalQuery[R]): R

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    Queries this year using the specified query.

    Queries this year using the specified query.

    This queries this year 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.

    R

    the type of the result

    query

    the query to invoke, not null

    returns

    the query result, null may be returned (defined by the query)

    Definition Classes
    YearTemporalAccessor
    Exceptions thrown

    ArithmeticException if numeric overflow occurs (defined by the query)

    DateTimeException if unable to query (defined by the query)

  44. def range(field: TemporalField): ValueRange

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    Gets the range of valid values for the specified 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 year 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 supported fields will return appropriate range instances. All other ChronoField instances will throw a DateTimeException.

    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.

    field

    the field to query the range for, not null

    returns

    the range of valid values for the field, not null

    Definition Classes
    YearTemporalAccessor
    Exceptions thrown

    DateTimeException if the range for the field cannot be obtained

  45. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef
  46. def toString(): String

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    Outputs this year as a String.

    Outputs this year as a String.

    returns

    a string representation of this year, not null

    Definition Classes
    Year → AnyRef → Any
  47. def until(endExclusive: Temporal, unit: TemporalUnit): Long

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    Calculates the period between this year and another year in terms of the specified unit.

    Calculates the period between this year and another year in terms of the specified unit.

    This calculates the period between two years in terms of a single unit. The start and end points are this and the specified year. The result will be negative if the end is before the start. The Temporal passed to this method must be a Year. For example, the period in decades between two year can be calculated using startYear.until(endYear, DECADES).

    The calculation returns a whole number, representing the number of complete units between the two years. For example, the period in decades between 2012 and 2031 will only be one decade as it is one year short of two decades.

    This method operates in association with TemporalUnit#between. The result of this method is a long representing the amount of the specified unit. By contrast, the result of between is an object that can be used directly in addition/subtraction:

    long period = start.until(end, YEARS);   // this method
    dateTime.plus(YEARS.between(start, end));      // use in plus/minus
    

    The calculation is implemented in this method for ChronoUnit. The units YEARS, DECADES, CENTURIES, MILLENNIA and ERAS are supported. Other ChronoUnit values will throw an exception.

    If the unit is not a ChronoUnit, then the result of this method is obtained by invoking TemporalUnit.between(Temporal, Temporal) passing this as the first argument and the input temporal as the second argument.

    This instance is immutable and unaffected by this method call.

    endExclusive

    the end year, which is converted to a { @code Year}, not null

    unit

    the unit to measure the period in, not null

    returns

    the amount of the period between this year and the end year

    Definition Classes
    YearTemporal
    Exceptions thrown

    ArithmeticException if numeric overflow occurs

    DateTimeException if the period cannot be calculated

  48. final def wait(): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  49. final def wait(arg0: Long, arg1: Int): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  50. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  51. def with(field: TemporalField, newValue: Long): Year

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    Returns a copy of this year with the specified field set to a new value.

    Returns a copy of this year with the specified field set to a new value.

    This returns a new Year, based on this one, with the value for the specified field changed. If it is not possible to set 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 adjustment is implemented here. The supported fields behave as follows:

    • YEAR_OF_ERA - Returns a Year with the specified year-of-era The era will be unchanged.
    • YEAR - Returns a Year with the specified year. This completely replaces the date and is equivalent to #of(int).
    • ERA - Returns a Year with the specified era. The year-of-era will be unchanged.

    In all cases, if the new value is outside the valid range of values for the field then a DateTimeException will be thrown.

    All other ChronoField instances will throw a DateTimeException.

    If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.adjustInto(Temporal, long) passing this as the argument. In this case, the field determines whether and how to adjust the instant.

    This instance is immutable and unaffected by this method call.

    field

    the field to set in the result, not null

    newValue

    the new value of the field in the result

    returns

    a { @code Year} based on { @code this} with the specified field set, not null

    Definition Classes
    YearTemporal
    Exceptions thrown

    ArithmeticException if numeric overflow occurs

    DateTimeException if the field cannot be set

  52. def with(adjuster: TemporalAdjuster): Year

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    Returns an adjusted copy of this year.

    Returns an adjusted copy of this year.

    This returns a new Year, based on this one, with the year adjusted. The adjustment takes place using the specified adjuster strategy object. Read the documentation of the adjuster to understand what adjustment will be made.

    The result of this method is obtained by invoking the TemporalAdjuster#adjustInto(Temporal) method on the specified adjuster passing this as the argument.

    This instance is immutable and unaffected by this method call.

    adjuster

    the adjuster to use, not null

    returns

    a { @code Year} based on { @code this} with the adjustment made, not null

    Definition Classes
    YearTemporal
    Exceptions thrown

    ArithmeticException if numeric overflow occurs

    DateTimeException if the adjustment cannot be made

Inherited from Serializable

Inherited from Ordered[Year]

Inherited from Comparable[Year]

Inherited from TemporalAdjuster

Inherited from Temporal

Inherited from TemporalAccessor

Inherited from AnyRef

Inherited from Any

Ungrouped