* {@code 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 {@code 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 will query the {@link java.time.Clock#systemDefaultZone() system clock} in 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. * * @return the current year using the system clock and default time-zone, not null */ public static Year now() { return now(Clock.systemDefaultZone()); } /** * Obtains the current year from the system clock in the specified time-zone. *
* This will query the {@link Clock#system(java.time.ZoneId) system clock} to 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. * * @param zone the zone ID to use, not null * @return the current year using the system clock, not null */ public static Year now(ZoneId zone) { return now(Clock.system(zone)); } /** * Obtains 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 {@link Clock dependency injection}. * * @param clock the clock to use, not null * @return the current year, not null */ public static Year now(Clock clock) { final LocalDate now = LocalDate.now(clock); // called once return Year.of(now.getYear()); } //----------------------------------------------------------------------- /** * Obtains an instance of {@code Year}. *
* 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.
*
* @param isoYear the ISO proleptic year to represent, from {@code MIN_VALUE} to {@code MAX_VALUE}
* @return the year, not null
* @throws DateTimeException if the field is invalid
*/
public static Year of(int isoYear) {
YEAR.checkValidValue(isoYear);
return new Year(isoYear);
}
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code Year} from a temporal object.
*
* A {@code TemporalAccessor} represents some form of date and time information. * This factory converts the arbitrary temporal object to an instance of {@code Year}. *
* The conversion extracts the {@link ChronoField#YEAR year} field. * The extraction is only permitted if the temporal object has an ISO * chronology, or can be converted to a {@code LocalDate}. *
* This method matches the signature of the functional interface {@link TemporalQuery} * allowing it to be used in queries via method reference, {@code Year::from}. * * @param temporal the temporal object to convert, not null * @return the year, not null * @throws DateTimeException if unable to convert to a {@code Year} */ public static Year from(TemporalAccessor temporal) { if (temporal instanceof Year) { return (Year) temporal; } try { if (ISOChrono.INSTANCE.equals(Chrono.from(temporal)) == false) { temporal = LocalDate.from(temporal); } return of(temporal.get(YEAR)); } catch (DateTimeException ex) { throw new DateTimeException("Unable to obtain Year from TemporalAccessor: " + temporal.getClass(), ex); } } //----------------------------------------------------------------------- /** * Obtains an instance of {@code Year} from a text string such as {@code 2007}. *
* The string must represent a valid year. * Years outside the range 0000 to 9999 must be prefixed by the plus or minus symbol. * * @param text the text to parse such as "2007", not null * @return the parsed year, not null * @throws DateTimeParseException if the text cannot be parsed */ public static Year parse(CharSequence text) { return parse(text, PARSER); } /** * Obtains an instance of {@code Year} from a text string using a specific formatter. *
* The text is parsed using the formatter, returning a year. * * @param text the text to parse, not null * @param formatter the formatter to use, not null * @return the parsed year, not null * @throws DateTimeParseException if the text cannot be parsed */ public static Year parse(CharSequence text, DateTimeFormatter formatter) { Objects.requireNonNull(formatter, "formatter"); return formatter.parse(text, Year::from); } //------------------------------------------------------------------------- /** * 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. * * @param year the year to check * @return true if the year is leap, false otherwise */ public static boolean isLeap(long year) { return ((year & 3) == 0) && ((year % 100) != 0 || (year % 400) == 0); } //----------------------------------------------------------------------- /** * Constructor. * * @param year the year to represent */ private Year(int year) { this.year = year; } //----------------------------------------------------------------------- /** * Gets the year value. *
* The year returned by this method is proleptic as per {@code get(YEAR)}. * * @return the year, {@code MIN_VALUE} to {@code MAX_VALUE} */ public int getValue() { return year; } //----------------------------------------------------------------------- /** * Checks if the specified field is supported. *
* This checks if this year can be queried for the specified field. * If false, then calling the {@link #range(TemporalField) range} and * {@link #get(TemporalField) get} methods will throw an exception. *
* If the field is a {@link ChronoField} then the query is implemented here. * The {@link #isSupported(TemporalField) supported fields} will return valid * values based on this date-time. * The supported fields are: *
* If the field is not a {@code ChronoField}, then the result of this method * is obtained by invoking {@code TemporalField.doIsSupported(TemporalAccessor)} * passing {@code this} as the argument. * Whether the field is supported is determined by the field. * * @param field the field to check, null returns false * @return true if the field is supported on this year, false if not */ @Override public boolean isSupported(TemporalField field) { if (field instanceof ChronoField) { return field == YEAR || field == YEAR_OF_ERA || field == ERA; } return field != null && field.doIsSupported(this); } /** * 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 {@link ChronoField} then the query is implemented here. * The {@link #isSupported(TemporalField) supported fields} will return * appropriate range instances. * All other {@code ChronoField} instances will throw a {@code DateTimeException}. *
* If the field is not a {@code ChronoField}, then the result of this method * is obtained by invoking {@code TemporalField.doRange(TemporalAccessor)} * passing {@code this} as the argument. * Whether the range can be obtained is determined by the field. * * @param field the field to query the range for, not null * @return the range of valid values for the field, not null * @throws DateTimeException if the range for the field cannot be obtained */ @Override public ValueRange range(TemporalField field) { if (field == YEAR_OF_ERA) { return (year <= 0 ? ValueRange.of(1, MAX_VALUE + 1) : ValueRange.of(1, MAX_VALUE)); } return Temporal.super.range(field); } /** * Gets the value of the specified field from this year as an {@code 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 {@link ChronoField} then the query is implemented here. * The {@link #isSupported(TemporalField) supported fields} will return valid * values based on this year. * All other {@code ChronoField} instances will throw a {@code DateTimeException}. *
* If the field is not a {@code ChronoField}, then the result of this method * is obtained by invoking {@code TemporalField.doGet(TemporalAccessor)} * passing {@code this} as the argument. Whether the value can be obtained, * and what the value represents, is determined by the field. * * @param field the field to get, not null * @return the value for the field * @throws DateTimeException if a value for the field cannot be obtained * @throws ArithmeticException if numeric overflow occurs */ @Override // override for Javadoc public int get(TemporalField field) { return range(field).checkValidIntValue(getLong(field), field); } /** * Gets the value of the specified field from this year as a {@code 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 {@link ChronoField} then the query is implemented here. * The {@link #isSupported(TemporalField) supported fields} will return valid * values based on this year. * All other {@code ChronoField} instances will throw a {@code DateTimeException}. *
* If the field is not a {@code ChronoField}, then the result of this method * is obtained by invoking {@code TemporalField.doGet(TemporalAccessor)} * passing {@code this} as the argument. Whether the value can be obtained, * and what the value represents, is determined by the field. * * @param field the field to get, not null * @return the value for the field * @throws DateTimeException if a value for the field cannot be obtained * @throws ArithmeticException if numeric overflow occurs */ @Override public long getLong(TemporalField field) { if (field instanceof ChronoField) { switch ((ChronoField) field) { case YEAR_OF_ERA: return (year < 1 ? 1 - year : year); case YEAR: return year; case ERA: return (year < 1 ? 0 : 1); } throw new DateTimeException("Unsupported field: " + field.getName()); } return field.doGet(this); } //----------------------------------------------------------------------- /** * 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. * * @return true if the year is leap, false otherwise */ public boolean isLeap() { return Year.isLeap(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. * * @param monthDay the month-day to validate, null returns false * @return true if the month and day are valid for this year */ public boolean isValidMonthDay(MonthDay monthDay) { return monthDay != null && monthDay.isValidYear(year); } /** * Gets the length of this year in days. * * @return the length of this year in days, 365 or 366 */ public int length() { return isLeap() ? 366 : 365; } //----------------------------------------------------------------------- /** * Returns an adjusted copy of this year. *
* This returns a new {@code 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 * {@link TemporalAdjuster#adjustInto(Temporal)} method on the * specified adjuster passing {@code this} as the argument. *
* This instance is immutable and unaffected by this method call. * * @param adjuster the adjuster to use, not null * @return a {@code Year} based on {@code this} with the adjustment made, not null * @throws DateTimeException if the adjustment cannot be made * @throws ArithmeticException if numeric overflow occurs */ @Override public Year with(TemporalAdjuster adjuster) { return (Year) adjuster.adjustInto(this); } /** * Returns a copy of this year with the specified field set to a new value. *
* This returns a new {@code 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 {@link ChronoField} then the adjustment is implemented here. * The supported fields behave as follows: *
* In all cases, if the new value is outside the valid range of values for the field * then a {@code DateTimeException} will be thrown. *
* All other {@code ChronoField} instances will throw a {@code DateTimeException}. *
* If the field is not a {@code ChronoField}, then the result of this method * is obtained by invoking {@code TemporalField.doWith(Temporal, long)} * passing {@code 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. * * @param field the field to set in the result, not null * @param newValue the new value of the field in the result * @return a {@code Year} based on {@code this} with the specified field set, not null * @throws DateTimeException if the field cannot be set * @throws ArithmeticException if numeric overflow occurs */ @Override public Year with(TemporalField field, long newValue) { if (field instanceof ChronoField) { ChronoField f = (ChronoField) field; f.checkValidValue(newValue); switch (f) { case YEAR_OF_ERA: return Year.of((int) (year < 1 ? 1 - newValue : newValue)); case YEAR: return Year.of((int) newValue); case ERA: return (getLong(ERA) == newValue ? this : Year.of(1 - year)); } throw new DateTimeException("Unsupported field: " + field.getName()); } return field.doWith(this, newValue); } //----------------------------------------------------------------------- /** * 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 {@link java.time.Period} but may be any other type implementing * the {@link TemporalAdder} interface. * The calculation is delegated to the specified adjuster, which typically calls * back to {@link #plus(long, TemporalUnit)}. *
* This instance is immutable and unaffected by this method call. * * @param adder the adder to use, not null * @return a {@code Year} based on this year with the addition made, not null * @throws DateTimeException if the addition cannot be made * @throws ArithmeticException if numeric overflow occurs */ @Override public Year plus(TemporalAdder adder) { return (Year) adder.addTo(this); } /** * {@inheritDoc} * @throws DateTimeException {@inheritDoc} * @throws ArithmeticException {@inheritDoc} */ @Override public Year plus(long amountToAdd, TemporalUnit unit) { if (unit instanceof ChronoUnit) { switch ((ChronoUnit) unit) { case YEARS: return plusYears(amountToAdd); case DECADES: return plusYears(Math.multiplyExact(amountToAdd, 10)); case CENTURIES: return plusYears(Math.multiplyExact(amountToAdd, 100)); case MILLENNIA: return plusYears(Math.multiplyExact(amountToAdd, 1000)); case ERAS: return with(ERA, Math.addExact(getLong(ERA), amountToAdd)); } throw new DateTimeException("Unsupported unit: " + unit.getName()); } return unit.doPlus(this, amountToAdd); } /** * Returns a copy of this year with the specified number of years added. *
* This instance is immutable and unaffected by this method call. * * @param yearsToAdd the years to add, may be negative * @return a {@code Year} based on this year with the period added, not null * @throws DateTimeException if the result exceeds the supported year range */ public Year plusYears(long yearsToAdd) { if (yearsToAdd == 0) { return this; } return of(YEAR.checkValidIntValue(year + yearsToAdd)); // overflow safe } //----------------------------------------------------------------------- /** * 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 {@link java.time.Period} but may be any other type implementing * the {@link TemporalSubtractor} interface. * The calculation is delegated to the specified adjuster, which typically calls * back to {@link #minus(long, TemporalUnit)}. *
* This instance is immutable and unaffected by this method call. * * @param subtractor the subtractor to use, not null * @return a {@code Year} based on this year with the subtraction made, not null * @throws DateTimeException if the subtraction cannot be made * @throws ArithmeticException if numeric overflow occurs */ @Override public Year minus(TemporalSubtractor subtractor) { return (Year) subtractor.subtractFrom(this); } /** * {@inheritDoc} * @throws DateTimeException {@inheritDoc} * @throws ArithmeticException {@inheritDoc} */ @Override public Year minus(long amountToSubtract, TemporalUnit unit) { return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit)); } /** * Returns a copy of this year with the specified number of years subtracted. *
* This instance is immutable and unaffected by this method call. * * @param yearsToSubtract the years to subtract, may be negative * @return a {@code Year} based on this year with the period subtracted, not null * @throws DateTimeException if the result exceeds the supported year range */ public Year minusYears(long yearsToSubtract) { return (yearsToSubtract == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-yearsToSubtract)); } //----------------------------------------------------------------------- /** * Queries this year using the specified query. *
* This queries this year using the specified query strategy object. * The {@code 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
* {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
* specified query passing {@code this} as the argument.
*
* @param
* 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 {@link Temporal#with(TemporalField, long)}
* passing {@link ChronoField#YEAR} as the field.
* If the specified temporal object does not use the ISO calendar system then
* a {@code DateTimeException} is thrown.
*
* In most cases, it is clearer to reverse the calling pattern by using
* {@link Temporal#with(TemporalAdjuster)}:
*
* This instance is immutable and unaffected by this method call.
*
* @param temporal the target object to be adjusted, not null
* @return the adjusted object, not null
* @throws DateTimeException if unable to make the adjustment
* @throws ArithmeticException if numeric overflow occurs
*/
@Override
public Temporal adjustInto(Temporal temporal) {
if (Chrono.from(temporal).equals(ISOChrono.INSTANCE) == false) {
throw new DateTimeException("Adjustment only supported on ISO date-time");
}
return temporal.with(YEAR, year);
}
/**
* 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 {@code this} and the specified year.
* The result will be negative if the end is before the start.
* The {@code Temporal} passed to this method must be a {@code Year}.
* For example, the period in decades between two year can be calculated
* using {@code startYear.periodUntil(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 {@link TemporalUnit#between}.
* The result of this method is a {@code long} representing the amount of
* the specified unit. By contrast, the result of {@code between} is an
* object that can be used directly in addition/subtraction:
*
* The calculation is implemented in this method for {@link ChronoUnit}.
* The units {@code YEARS}, {@code DECADES}, {@code CENTURIES},
* {@code MILLENNIA} and {@code ERAS} are supported.
* Other {@code ChronoUnit} values will throw an exception.
*
* If the unit is not a {@code ChronoUnit}, then the result of this method
* is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)}
* passing {@code this} as the first argument and the input temporal as
* the second argument.
*
* This instance is immutable and unaffected by this method call.
*
* @param endYear the end year, which must be a {@code Year}, not null
* @param unit the unit to measure the period in, not null
* @return the amount of the period between this year and the end year
* @throws DateTimeException if the period cannot be calculated
* @throws ArithmeticException if numeric overflow occurs
*/
@Override
public long periodUntil(Temporal endYear, TemporalUnit unit) {
if (endYear instanceof Year == false) {
Objects.requireNonNull(endYear, "endYear");
throw new DateTimeException("Unable to calculate period between objects of two different types");
}
Year end = (Year) endYear;
if (unit instanceof ChronoUnit) {
long yearsUntil = ((long) end.year) - year; // no overflow
switch ((ChronoUnit) unit) {
case YEARS: return yearsUntil;
case DECADES: return yearsUntil / 10;
case CENTURIES: return yearsUntil / 100;
case MILLENNIA: return yearsUntil / 1000;
case ERAS: return end.getLong(ERA) - getLong(ERA);
}
throw new DateTimeException("Unsupported unit: " + unit.getName());
}
return unit.between(this, endYear).getAmount();
}
//-----------------------------------------------------------------------
/**
* Returns a date formed from this year at the specified day-of-year.
*
* This combines this year and the specified day-of-year to form a {@code LocalDate}.
* The day-of-year value 366 is only valid in a leap year.
*
* This instance is immutable and unaffected by this method call.
*
* @param dayOfYear the day-of-year to use, not null
* @return the local date formed from this year and the specified date of year, not null
* @throws DateTimeException if the day of year is 366 and this is not a leap year
*/
public LocalDate atDay(int dayOfYear) {
return LocalDate.ofYearDay(year, dayOfYear);
}
/**
* Returns a year-month formed from this year at the specified month.
*
* This combines this year and the specified month to form a {@code YearMonth}.
* All possible combinations of year and month are valid.
*
* This method can be used as part of a chain to produce a date:
*
* This instance is immutable and unaffected by this method call.
*
* @param month the month-of-year to use, not null
* @return the year-month formed from this year and the specified month, not null
*/
public YearMonth atMonth(Month month) {
return YearMonth.of(year, month);
}
/**
* Returns a year-month formed from this year at the specified month.
*
* This combines this year and the specified month to form a {@code YearMonth}.
* All possible combinations of year and month are valid.
*
* This method can be used as part of a chain to produce a date:
*
* This instance is immutable and unaffected by this method call.
*
* @param month the month-of-year to use, from 1 (January) to 12 (December)
* @return the year-month formed from this year and the specified month, not null
*/
public YearMonth atMonth(int month) {
return YearMonth.of(year, month);
}
/**
* Returns a date formed from this year at the specified month-day.
*
* This combines this year and the specified month-day to form a {@code LocalDate}.
* The month-day value of February 29th is only valid in a leap year.
*
* This instance is immutable and unaffected by this method call.
*
* @param monthDay the month-day to use, not null
* @return the local date formed from this year and the specified month-day, not null
* @throws DateTimeException if the month-day is February 29th and this is not a leap year
*/
public LocalDate atMonthDay(MonthDay monthDay) {
return LocalDate.of(year, monthDay.getMonth(), monthDay.getDayOfMonth());
}
//-----------------------------------------------------------------------
/**
* Compares this year to another year.
*
* The comparison is based on the value of the year.
* It is "consistent with equals", as defined by {@link Comparable}.
*
* @param other the other year to compare to, not null
* @return the comparator value, negative if less, positive if greater
*/
public int compareTo(Year other) {
return year - other.year;
}
/**
* Is this year after the specified year.
*
* @param other the other year to compare to, not null
* @return true if this is after the specified year
*/
public boolean isAfter(Year other) {
return year > other.year;
}
/**
* Is this year before the specified year.
*
* @param other the other year to compare to, not null
* @return true if this point is before the specified year
*/
public boolean isBefore(Year other) {
return year < other.year;
}
//-----------------------------------------------------------------------
/**
* Checks if this year is equal to another year.
*
* The comparison is based on the time-line position of the years.
*
* @param obj the object to check, null returns false
* @return true if this is equal to the other year
*/
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof Year) {
return year == ((Year) obj).year;
}
return false;
}
/**
* A hash code for this year.
*
* @return a suitable hash code
*/
@Override
public int hashCode() {
return year;
}
//-----------------------------------------------------------------------
/**
* Outputs this year as a {@code String}.
*
* @return a string representation of this year, not null
*/
@Override
public String toString() {
return Integer.toString(year);
}
/**
* Outputs this year as a {@code String} using the formatter.
*
* This year will be passed to the formatter
* {@link DateTimeFormatter#print(TemporalAccessor) print method}.
*
* @param formatter the formatter to use, not null
* @return the formatted year string, not null
* @throws DateTimeException if an error occurs during printing
*/
public String toString(DateTimeFormatter formatter) {
Objects.requireNonNull(formatter, "formatter");
return formatter.print(this);
}
//-----------------------------------------------------------------------
/**
* Writes the object using a
* dedicated serialized form.
*
* // these two lines are equivalent, but the second approach is recommended
* temporal = thisYear.adjustInto(temporal);
* temporal = temporal.with(thisYear);
*
*
* long period = start.periodUntil(end, YEARS); // this method
* dateTime.plus(YEARS.between(start, end)); // use in plus/minus
*
*
* LocalDate date = year.atMonth(month).atDay(day);
*
*
* LocalDate date = year.atMonth(month).atDay(day);
*
*
* out.writeByte(4); // identifies this as a Year
* out.writeInt(year);
*
*
* @return the instance of {@code Ser}, not null
*/
private Object writeReplace() {
return new Ser(Ser.YEAR_TYPE, this);
}
/**
* Defend against malicious streams.
* @return never
* @throws InvalidObjectException always
*/
private Object readResolve() throws ObjectStreamException {
throw new InvalidObjectException("Deserialization via serialization delegate");
}
void writeExternal(DataOutput out) throws IOException {
out.writeInt(year);
}
static Year readExternal(DataInput in) throws IOException {
return Year.of(in.readInt());
}
}