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org.joda.time
Class Years

java.lang.Object
  extended by org.joda.time.base.BaseSingleFieldPeriod
      extended by org.joda.time.Years
All Implemented Interfaces:
Serializable, Comparable<BaseSingleFieldPeriod>, ReadablePeriod
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 months, 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.

Since:
1.4
See Also:
Serialized Form

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, getValue, getValue, hashCode, isSupported, setValue, size, standardPeriodIn, toMutablePeriod, toPeriod
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

ZERO

public static final Years ZERO
Constant representing zero years.

ONE

public static final Years ONE
Constant representing one year.

TWO

public static final Years TWO
Constant representing two years.

THREE

public static final Years THREE
Constant representing three years.

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.

Method Detail

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
Throws:
IllegalArgumentException - if the instants are null or invalid

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
Throws:
IllegalArgumentException - if the partials are null or invalid

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
Throws:
IllegalArgumentException - if the partials are null or invalid

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
Throws:
IllegalArgumentException - if the string format is invalid

getFieldType

public DurationFieldType getFieldType()
Gets the duration field type, which is years.

Specified by:
getFieldType in class BaseSingleFieldPeriod
Returns:
the period type

getPeriodType

public PeriodType getPeriodType()
Gets the period type, which is years.

Specified by:
getPeriodType in interface ReadablePeriod
Specified by:
getPeriodType in class 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

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
Throws:
ArithmeticException - if the result overflows an int

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
Throws:
ArithmeticException - if the result overflows an int

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
Throws:
ArithmeticException - if the result overflows an int

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
Throws:
ArithmeticException - if the result overflows an int

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
Throws:
ArithmeticException - if the result overflows an int

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
Throws:
ArithmeticException - if the divisor is zero

negated

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

Returns:
the new period with a negated value
Throws:
ArithmeticException - if the result overflows an int

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

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
Overrides:
toString in class Object
Returns:
the value as an ISO8601 string
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