Class Year
- All Implemented Interfaces:
- Serializable,- Comparable<Year>,- Temporal,- TemporalAccessor,- TemporalAdjuster
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.
 This is a value-based
 class; programmers should treat instances that are
 equal as interchangeable and should not
 use instances for synchronization, or unpredictable behavior may
 occur. For example, in a future release, synchronization may fail.
 The equals method should be used for comparisons.
- Implementation Requirements:
- This class is immutable and thread-safe.
- Since:
- 1.8
- See Also:
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Field SummaryFields
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Method SummaryModifier and TypeMethodDescriptionadjustInto(Temporal temporal) Adjusts the specified temporal object to have this year.atDay(int dayOfYear) Combines this year with a day-of-year to create aLocalDate.atMonth(int month) Combines this year with a month to create aYearMonth.Combines this year with a month to create aYearMonth.atMonthDay(MonthDay monthDay) Combines this year with a month-day to create aLocalDate.intCompares this year to another year.booleanChecks if this year is equal to another year.format(DateTimeFormatter formatter) Formats this year using the specified formatter.static Yearfrom(TemporalAccessor temporal) Obtains an instance ofYearfrom a temporal object.intget(TemporalField field) Gets the value of the specified field from this year as anint.longgetLong(TemporalField field) Gets the value of the specified field from this year as along.intgetValue()Gets the year value.inthashCode()A hash code for this year.booleanChecks if this year is after the specified year.booleanChecks if this year is before the specified year.booleanisLeap()Checks if the year is a leap year, according to the ISO proleptic calendar system rules.static booleanisLeap(long year) Checks if the year is a leap year, according to the ISO proleptic calendar system rules.booleanisSupported(TemporalField field) Checks if the specified field is supported.booleanisSupported(TemporalUnit unit) Checks if the specified unit is supported.booleanisValidMonthDay(MonthDay monthDay) Checks if the month-day is valid for this year.intlength()Gets the length of this year in days.minus(long amountToSubtract, TemporalUnit unit) Returns a copy of this year with the specified amount subtracted.minus(TemporalAmount amountToSubtract) Returns a copy of this year with the specified amount subtracted.minusYears(long yearsToSubtract) Returns a copy of thisYearwith the specified number of years subtracted.static Yearnow()Obtains the current year from the system clock in the default time-zone.static YearObtains the current year from the specified clock.static YearObtains the current year from the system clock in the specified time-zone.static Yearof(int isoYear) Obtains an instance ofYear.static Yearparse(CharSequence text) Obtains an instance ofYearfrom a text string such as2007.static Yearparse(CharSequence text, DateTimeFormatter formatter) Obtains an instance ofYearfrom a text string using a specific formatter.plus(long amountToAdd, TemporalUnit unit) Returns a copy of this year with the specified amount added.plus(TemporalAmount amountToAdd) Returns a copy of this year with the specified amount added.plusYears(long yearsToAdd) Returns a copy of thisYearwith the specified number of years added.<R> Rquery(TemporalQuery<R> query) Queries this year using the specified query.range(TemporalField field) Gets the range of valid values for the specified field.toString()Outputs this year as aString.longuntil(Temporal endExclusive, TemporalUnit unit) Calculates the amount of time until another year in terms of the specified unit.with(TemporalAdjuster adjuster) Returns an adjusted copy of this year.with(TemporalField field, long newValue) Returns a copy of this year with the specified field set to a new value.
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Field Details- 
MIN_VALUEpublic static final int MIN_VALUEThe minimum supported year, '-999,999,999'.- See Also:
 
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MAX_VALUEpublic static final int MAX_VALUEThe maximum supported year, '+999,999,999'.- See Also:
 
 
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Method Details- 
nowObtains the current year from the system clock in the default time-zone.This will query the system clockin the default time-zone to obtain the current year.Using this method will prevent the ability to use an alternate clock for testing because the clock is hard-coded. - Returns:
- the current year using the system clock and default time-zone, not null
 
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nowObtains the current year from the system clock in the specified time-zone.This will query the system clockto obtain the current year. Specifying the time-zone avoids dependence on the default time-zone.Using this method will prevent the ability to use an alternate clock for testing because the clock is hard-coded. - Parameters:
- zone- the zone ID to use, not null
- Returns:
- the current year using the system clock, not null
 
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nowObtains the current year from the specified clock.This will query the specified clock to obtain the current year. Using this method allows the use of an alternate clock for testing. The alternate clock may be introduced using dependency injection.- Parameters:
- clock- the clock to use, not null
- Returns:
- the current year, not null
 
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ofObtains an instance ofYear.This method accepts a year value from the proleptic ISO calendar system. The year 2AD/CE is represented by 2. 
 The year 1AD/CE is represented by 1.
 The year 1BC/BCE is represented by 0.
 The year 2BC/BCE is represented by -1.- Parameters:
- isoYear- the ISO proleptic year to represent, from- MIN_VALUEto- MAX_VALUE
- Returns:
- the year, not null
- Throws:
- DateTimeException- if the field is invalid
 
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fromObtains an instance ofYearfrom a temporal object.This obtains a year based on the specified temporal. A TemporalAccessorrepresents an arbitrary set of date and time information, which this factory converts to an instance ofYear.The conversion extracts the yearfield. The extraction is only permitted if the temporal object has an ISO chronology, or can be converted to aLocalDate.This method matches the signature of the functional interface TemporalQueryallowing it to be used as a query via method reference,Year::from.- Parameters:
- temporal- the temporal object to convert, not null
- Returns:
- the year, not null
- Throws:
- DateTimeException- if unable to convert to a- Year
 
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parseObtains an instance ofYearfrom a text string such as2007.The string must represent a valid year. - Parameters:
- text- the text to parse such as "2007", not null
- Returns:
- the parsed year, not null
- Throws:
- DateTimeParseException- if the text cannot be parsed
 
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parseObtains an instance ofYearfrom a text string using a specific formatter.The text is parsed using the formatter, returning a year. - Parameters:
- text- the text to parse, not null
- formatter- the formatter to use, not null
- Returns:
- the parsed year, not null
- Throws:
- DateTimeParseException- if the text cannot be parsed
 
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isLeappublic static boolean isLeap(long year) 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. - Parameters:
- year- the year to check
- Returns:
- true if the year is leap, false otherwise
 
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getValuepublic int getValue()Gets the year value.The year returned by this method is proleptic as per get(YEAR).- Returns:
- the year, MIN_VALUEtoMAX_VALUE
 
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isSupportedChecks if the specified field is supported.This checks if this year can be queried for the specified field. If false, then calling the range,getandwith(TemporalField, long)methods will throw an exception.If the field is a ChronoFieldthen the query is implemented here. The supported fields are:- YEAR_OF_ERA
- YEAR
- ERA
 ChronoFieldinstances will return false.If the field is not a ChronoField, then the result of this method is obtained by invokingTemporalField.isSupportedBy(TemporalAccessor)passingthisas the argument. Whether the field is supported is determined by the field.- Specified by:
- isSupportedin interface- TemporalAccessor
- Parameters:
- field- the field to check, null returns false
- Returns:
- true if the field is supported on this year, false if not
 
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isSupportedChecks if the specified unit is supported.This checks if the specified unit can be added to, or subtracted from, this year. If false, then calling the plus(long, TemporalUnit)andminusmethods will throw an exception.If the unit is a ChronoUnitthen the query is implemented here. The supported units are:- YEARS
- DECADES
- CENTURIES
- MILLENNIA
- ERAS
 ChronoUnitinstances will return false.If the unit is not a ChronoUnit, then the result of this method is obtained by invokingTemporalUnit.isSupportedBy(Temporal)passingthisas the argument. Whether the unit is supported is determined by the unit.- Specified by:
- isSupportedin interface- Temporal
- Parameters:
- unit- the unit to check, null returns false
- Returns:
- true if the unit can be added/subtracted, false if not
 
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rangeGets 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 ChronoFieldthen the query is implemented here. Thesupported fieldswill return appropriate range instances. All otherChronoFieldinstances will throw anUnsupportedTemporalTypeException.If the field is not a ChronoField, then the result of this method is obtained by invokingTemporalField.rangeRefinedBy(TemporalAccessor)passingthisas the argument. Whether the range can be obtained is determined by the field.- Specified by:
- rangein 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 field is not supported
 
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getGets the value of the specified field from this year as anint.This queries this year 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 ChronoFieldthen the query is implemented here. Thesupported fieldswill return valid values based on this year. All otherChronoFieldinstances will throw anUnsupportedTemporalTypeException.If the field is not a ChronoField, then the result of this method is obtained by invokingTemporalField.getFrom(TemporalAccessor)passingthisas the argument. Whether the value can be obtained, and what the value represents, is determined by the field.- Specified by:
- getin 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
- ArithmeticException- if numeric overflow occurs
 
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getLongGets the value of the specified field from this year as along.This queries this year 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 ChronoFieldthen the query is implemented here. Thesupported fieldswill return valid values based on this year. All otherChronoFieldinstances will throw anUnsupportedTemporalTypeException.If the field is not a ChronoField, then the result of this method is obtained by invokingTemporalField.getFrom(TemporalAccessor)passingthisas the argument. Whether the value can be obtained, and what the value represents, is determined by the field.- Specified by:
- getLongin 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
- ArithmeticException- if numeric overflow occurs
 
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isLeappublic boolean isLeap()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
 
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isValidMonthDayChecks 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. - Parameters:
- monthDay- the month-day to validate, null returns false
- Returns:
- true if the month and day are valid for this year
 
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lengthpublic int length()Gets the length of this year in days.- Returns:
- the length of this year in days, 365 or 366
 
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withReturns an adjusted copy of this year.This returns a 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 passingthisas the argument.This instance is immutable and unaffected by this method call. - Specified by:
- within interface- Temporal
- Parameters:
- adjuster- the adjuster to use, not null
- Returns:
- a Yearbased onthiswith the adjustment made, not null
- Throws:
- DateTimeException- if the adjustment cannot be made
- ArithmeticException- if numeric overflow occurs
 
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withReturns a copy of this year with the specified field set to a new value.This returns a 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 ChronoFieldthen the adjustment is implemented here. The supported fields behave as follows:- YEAR_OF_ERA- Returns a- Yearwith the specified year-of-era The era will be unchanged.
- YEAR- Returns a- Yearwith the specified year. This completely replaces the date and is equivalent to- of(int).
- ERA- Returns a- Yearwith 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 DateTimeExceptionwill be thrown.All other ChronoFieldinstances will throw anUnsupportedTemporalTypeException.If the field is not a ChronoField, then the result of this method is obtained by invokingTemporalField.adjustInto(Temporal, long)passingthisas 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. - Specified by:
- within interface- Temporal
- Parameters:
- field- the field to set in the result, not null
- newValue- the new value of the field in the result
- Returns:
- a Yearbased onthiswith the specified field set, not null
- Throws:
- DateTimeException- if the field cannot be set
- UnsupportedTemporalTypeException- if the field is not supported
- ArithmeticException- if numeric overflow occurs
 
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plusReturns a copy of this year with the specified amount added.This returns a Year, based on this one, with the specified amount added. The amount is typicallyPeriodbut may be any other type implementing theTemporalAmountinterface.The calculation is delegated to the amount object by calling TemporalAmount.addTo(Temporal). The amount implementation is free to implement the addition in any way it wishes, however it typically calls back toplus(long, TemporalUnit). Consult the documentation of the amount implementation to determine if it can be successfully added.This instance is immutable and unaffected by this method call. - Specified by:
- plusin interface- Temporal
- Parameters:
- amountToAdd- the amount to add, not null
- Returns:
- a Yearbased on this year with the addition made, not null
- Throws:
- DateTimeException- if the addition cannot be made
- ArithmeticException- if numeric overflow occurs
 
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plusReturns a copy of this year with the specified amount added.This returns a Year, based on this one, with the amount in terms of the unit added. If it is not possible to add the amount, because the unit is not supported or for some other reason, an exception is thrown.If the field is a ChronoUnitthen the addition is implemented here. The supported fields behave as follows:- YEARS- Returns a- Yearwith the specified number of years added. This is equivalent to- plusYears(long).
- DECADES- Returns a- Yearwith the specified number of decades added. This is equivalent to calling- plusYears(long)with the amount multiplied by 10.
- CENTURIES- Returns a- Yearwith the specified number of centuries added. This is equivalent to calling- plusYears(long)with the amount multiplied by 100.
- MILLENNIA- Returns a- Yearwith the specified number of millennia added. This is equivalent to calling- plusYears(long)with the amount multiplied by 1,000.
- ERAS- Returns a- Yearwith the specified number of eras added. Only two eras are supported so the amount must be one, zero or minus one. If the amount is non-zero then the year is changed such that the year-of-era is unchanged.
 All other ChronoUnitinstances will throw anUnsupportedTemporalTypeException.If the field is not a ChronoUnit, then the result of this method is obtained by invokingTemporalUnit.addTo(Temporal, long)passingthisas the argument. In this case, the unit determines whether and how to perform the addition.This instance is immutable and unaffected by this method call. - Specified by:
- plusin interface- Temporal
- Parameters:
- amountToAdd- the amount of the unit to add to the result, may be negative
- unit- the unit of the amount to add, not null
- Returns:
- a Yearbased on this year with the specified amount added, not null
- Throws:
- DateTimeException- if the addition cannot be made
- UnsupportedTemporalTypeException- if the unit is not supported
- ArithmeticException- if numeric overflow occurs
 
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plusYearsReturns a copy of thisYearwith the specified number of years added.This instance is immutable and unaffected by this method call. - Parameters:
- yearsToAdd- the years to add, may be negative
- Returns:
- a Yearbased on this year with the years added, not null
- Throws:
- DateTimeException- if the result exceeds the supported range
 
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minusReturns a copy of this year with the specified amount subtracted.This returns a Year, based on this one, with the specified amount subtracted. The amount is typicallyPeriodbut may be any other type implementing theTemporalAmountinterface.The calculation is delegated to the amount object by calling TemporalAmount.subtractFrom(Temporal). The amount implementation is free to implement the subtraction in any way it wishes, however it typically calls back tominus(long, TemporalUnit). Consult the documentation of the amount implementation to determine if it can be successfully subtracted.This instance is immutable and unaffected by this method call. - Specified by:
- minusin interface- Temporal
- Parameters:
- amountToSubtract- the amount to subtract, not null
- Returns:
- a Yearbased on this year with the subtraction made, not null
- Throws:
- DateTimeException- if the subtraction cannot be made
- ArithmeticException- if numeric overflow occurs
 
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minusReturns a copy of this year with the specified amount subtracted.This returns a Year, based on this one, with the amount in terms of the unit subtracted. If it is not possible to subtract the amount, because the unit is not supported or for some other reason, an exception is thrown.This method is equivalent to plus(long, TemporalUnit)with the amount negated. See that method for a full description of how addition, and thus subtraction, works.This instance is immutable and unaffected by this method call. - Specified by:
- minusin interface- Temporal
- Parameters:
- amountToSubtract- the amount of the unit to subtract from the result, may be negative
- unit- the unit of the amount to subtract, not null
- Returns:
- a Yearbased on this year with the specified amount subtracted, not null
- Throws:
- DateTimeException- if the subtraction cannot be made
- UnsupportedTemporalTypeException- if the unit is not supported
- ArithmeticException- if numeric overflow occurs
 
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minusYearsReturns a copy of thisYearwith the specified number of years subtracted.This instance is immutable and unaffected by this method call. - Parameters:
- yearsToSubtract- the years to subtract, may be negative
- Returns:
- a Yearbased on this year with the year subtracted, not null
- Throws:
- DateTimeException- if the result exceeds the supported range
 
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queryQueries this year using the specified query.This queries this year using the specified query strategy object. The TemporalQueryobject 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 passingthisas the argument.- Specified by:
- queryin 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)
- ArithmeticException- if numeric overflow occurs (defined by the query)
 
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adjustIntoAdjusts 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 Temporal.with(TemporalField, long)passingChronoField.YEARas the field. If the specified temporal object does not use the ISO calendar system then aDateTimeExceptionis 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. - Specified by:
- adjustIntoin 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
- ArithmeticException- if numeric overflow occurs
 
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untilCalculates the amount of time until another year in terms of the specified unit.This calculates the amount of time between two Yearobjects in terms of a singleTemporalUnit. The start and end points arethisand the specified year. The result will be negative if the end is before the start. TheTemporalpassed to this method is converted to aYearusingfrom(TemporalAccessor). For example, the amount in decades between two year can be calculated usingstartYear.until(endYear, DECADES).The calculation returns a whole number, representing the number of complete units between the two years. For example, the amount in decades between 2012 and 2031 will only be one decade as it is one year short of two decades. There are two equivalent ways of using this method. The first is to invoke this method. The second is to use TemporalUnit.between(Temporal, Temporal):// these two lines are equivalent amount = start.until(end, YEARS); amount = YEARS.between(start, end); The choice should be made based on which makes the code more readable.The calculation is implemented in this method for ChronoUnit. The unitsYEARS,DECADES,CENTURIES,MILLENNIAandERASare supported. OtherChronoUnitvalues will throw an exception.If the unit is not a ChronoUnit, then the result of this method is obtained by invokingTemporalUnit.between(Temporal, Temporal)passingthisas the first argument and the converted input temporal as the second argument.This instance is immutable and unaffected by this method call. - Specified by:
- untilin interface- Temporal
- Parameters:
- endExclusive- the end date, exclusive, which is converted to a- Year, not null
- unit- the unit to measure the amount in, not null
- Returns:
- the amount of time between this year and the end year
- Throws:
- DateTimeException- if the amount cannot be calculated, or the end temporal cannot be converted to a- Year
- UnsupportedTemporalTypeException- if the unit is not supported
- ArithmeticException- if numeric overflow occurs
 
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formatFormats this year using the specified formatter.This year will be passed to the formatter to produce a string. - Parameters:
- formatter- the formatter to use, not null
- Returns:
- the formatted year string, not null
- Throws:
- DateTimeException- if an error occurs during printing
 
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atDayCombines this year with a day-of-year to create aLocalDate.This returns a LocalDateformed from this year and the specified day-of-year.The day-of-year value 366 is only valid in a leap year. - Parameters:
- dayOfYear- the day-of-year to use, from 1 to 365-366
- Returns:
- the local date formed from this year and the specified date of year, not null
- Throws:
- DateTimeException- if the day of year is zero or less, 366 or greater or equal to 366 and this is not a leap year
 
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atMonthCombines this year with a month to create aYearMonth.This returns a YearMonthformed 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); - Parameters:
- month- the month-of-year to use, not null
- Returns:
- the year-month formed from this year and the specified month, not null
 
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atMonthCombines this year with a month to create aYearMonth.This returns a YearMonthformed 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); - Parameters:
- 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
- Throws:
- DateTimeException- if the month is invalid
 
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atMonthDayCombines this year with a month-day to create aLocalDate.This returns a LocalDateformed 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. - Parameters:
- monthDay- the month-day to use, not null
- Returns:
- the local date formed from this year and the specified month-day, not null
 
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compareToCompares this year to another year.The comparison is based on the value of the year. It is "consistent with equals", as defined by Comparable.- Specified by:
- compareToin interface- Comparable<Year>
- Parameters:
- other- the other year to compare to, not null
- Returns:
- the comparator value, that is less than zero if this is before other, zero if they are equal, or greater than zero if this is afterother
- See Also:
 
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isAfterChecks if this year is after the specified year.- Parameters:
- other- the other year to compare to, not null
- Returns:
- true if this is after the specified year
 
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isBeforeChecks if this year is before the specified year.- Parameters:
- other- the other year to compare to, not null
- Returns:
- true if this point is before the specified year
 
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equals
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hashCode
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toString
 
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