org.joda.time

Class Years

Implemented Interfaces:
Comparable, ReadablePeriod, Serializable

public final class Years
extends BaseSingleFieldPeriod

An immutable time period representing a number of years.

Years is an immutable period that can only store years. It does not store years, days or hours for example. As such it is a type-safe way of representing a number of years in an application.

The number of years is set in the constructor, and may be queried using getYears(). Basic mathematical operations are provided - plus(), minus(), multipliedBy() and dividedBy().

Years is thread-safe and immutable.

Author:
Stephen Colebourne
Since:
1.4

Field Summary

static Years
MAX_VALUE
Constant representing the maximum number of years that can be stored in this object.
static Years
MIN_VALUE
Constant representing the minimum number of years that can be stored in this object.
static Years
ONE
Constant representing one year.
static Years
THREE
Constant representing three years.
static Years
TWO
Constant representing two years.
static Years
ZERO
Constant representing zero years.

Method Summary

Years
dividedBy(int divisor)
Returns a new instance with the years divided by the specified divisor.
DurationFieldType
getFieldType()
Gets the duration field type, which is years.
PeriodType
getPeriodType()
Gets the period type, which is years.
int
getYears()
Gets the number of years that this period represents.
boolean
isGreaterThan(Years other)
Is this years instance greater than the specified number of years.
boolean
isLessThan(Years other)
Is this years instance less than the specified number of years.
Years
minus(int years)
Returns a new instance with the specified number of years taken away.
Years
minus(Years years)
Returns a new instance with the specified number of years taken away.
Years
multipliedBy(int scalar)
Returns a new instance with the years multiplied by the specified scalar.
Years
negated()
Returns a new instance with the years value negated.
static Years
parseYears(String periodStr)
Creates a new Years by parsing a string in the ISO8601 format 'PnY'.
Years
plus(int years)
Returns a new instance with the specified number of years added.
Years
plus(Years years)
Returns a new instance with the specified number of years added.
String
toString()
Gets this instance as a String in the ISO8601 duration format.
static Years
years(int years)
Obtains an instance of Years that may be cached.
static Years
yearsBetween(ReadableInstant start, ReadableInstant end)
Creates a Years representing the number of whole years between the two specified datetimes.
static Years
yearsBetween(ReadablePartial start, ReadablePartial end)
Creates a Years representing the number of whole years between the two specified partial datetimes.
static Years
yearsIn(ReadableInterval interval)
Creates a Years representing the number of whole years in the specified interval.

Methods inherited from class org.joda.time.base.BaseSingleFieldPeriod

between, between, compareTo, equals, get, getFieldType, getFieldType, getPeriodType, getValue, getValue, hashCode, isSupported, setValue, size, standardPeriodIn, toMutablePeriod, toPeriod

Field Details

MAX_VALUE

public static final Years MAX_VALUE
Constant representing the maximum number of years that can be stored in this object.

MIN_VALUE

public static final Years MIN_VALUE
Constant representing the minimum number of years that can be stored in this object.

ONE

public static final Years ONE
Constant representing one year.

THREE

public static final Years THREE
Constant representing three years.

TWO

public static final Years TWO
Constant representing two years.

ZERO

public static final Years ZERO
Constant representing zero years.

Method Details

dividedBy

public Years dividedBy(int divisor)
Returns a new instance with the years divided by the specified divisor. The calculation uses integer division, thus 3 divided by 2 is 1.

This instance is immutable and unaffected by this method call.

Parameters:
divisor - the amount to divide by, may be negative
Returns:
the new period divided by the specified divisor

getFieldType

public DurationFieldType getFieldType()
Gets the duration field type, which is years.
Overrides:
getFieldType in interface BaseSingleFieldPeriod
Returns:
the period type

getPeriodType

public PeriodType getPeriodType()
Gets the period type, which is years.
Specified by:
getPeriodType in interface ReadablePeriod
Overrides:
getPeriodType in interface BaseSingleFieldPeriod
Returns:
the period type

getYears

public int getYears()
Gets the number of years that this period represents.
Returns:
the number of years in the period

isGreaterThan

public boolean isGreaterThan(Years other)
Is this years instance greater than the specified number of years.
Parameters:
other - the other period, null means zero
Returns:
true if this years instance is greater than the specified one

isLessThan

public boolean isLessThan(Years other)
Is this years instance less than the specified number of years.
Parameters:
other - the other period, null means zero
Returns:
true if this years instance is less than the specified one

minus

public Years minus(int years)
Returns a new instance with the specified number of years taken away.

This instance is immutable and unaffected by this method call.

Parameters:
years - the amount of years to take away, may be negative
Returns:
the new period minus the specified number of years

minus

public Years minus(Years years)
Returns a new instance with the specified number of years taken away.

This instance is immutable and unaffected by this method call.

Parameters:
years - the amount of years to take away, may be negative, null means zero
Returns:
the new period minus the specified number of years

multipliedBy

public Years multipliedBy(int scalar)
Returns a new instance with the years multiplied by the specified scalar.

This instance is immutable and unaffected by this method call.

Parameters:
scalar - the amount to multiply by, may be negative
Returns:
the new period multiplied by the specified scalar

negated

public Years negated()
Returns a new instance with the years value negated.
Returns:
the new period with a negated value

parseYears

public static Years parseYears(String periodStr)
Creates a new Years by parsing a string in the ISO8601 format 'PnY'.

The parse will accept the full ISO syntax of PnYnMnWnDTnHnMnS however only the years component may be non-zero. If any other component is non-zero, an exception will be thrown.

Parameters:
periodStr - the period string, null returns zero
Returns:
the period in years

plus

public Years plus(int years)
Returns a new instance with the specified number of years added.

This instance is immutable and unaffected by this method call.

Parameters:
years - the amount of years to add, may be negative
Returns:
the new period plus the specified number of years

plus

public Years plus(Years years)
Returns a new instance with the specified number of years added.

This instance is immutable and unaffected by this method call.

Parameters:
years - the amount of years to add, may be negative, null means zero
Returns:
the new period plus the specified number of years

toString

public String toString()
Gets this instance as a String in the ISO8601 duration format.

For example, "P4Y" represents 4 years.

Specified by:
toString in interface ReadablePeriod
Returns:
the value as an ISO8601 string

years

public static Years years(int years)
Obtains an instance of Years that may be cached. Years is immutable, so instances can be cached and shared. This factory method provides access to shared instances.
Parameters:
years - the number of years to obtain an instance for
Returns:
the instance of Years

yearsBetween

public static Years yearsBetween(ReadableInstant start,
                                 ReadableInstant end)
Creates a Years representing the number of whole years between the two specified datetimes. This method corectly handles any daylight savings time changes that may occur during the interval.
Parameters:
start - the start instant, must not be null
end - the end instant, must not be null
Returns:
the period in years

yearsBetween

public static Years yearsBetween(ReadablePartial start,
                                 ReadablePartial end)
Creates a Years representing the number of whole years between the two specified partial datetimes.

The two partials must contain the same fields, for example you can specify two LocalDate objects.

Parameters:
start - the start partial date, must not be null
end - the end partial date, must not be null
Returns:
the period in years

yearsIn

public static Years yearsIn(ReadableInterval interval)
Creates a Years representing the number of whole years in the specified interval. This method corectly handles any daylight savings time changes that may occur during the interval.
Parameters:
interval - the interval to extract years from, null returns zero
Returns:
the period in years

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