Class Months
- java.lang.Object
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- org.joda.time.base.BaseSingleFieldPeriod
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- org.joda.time.Months
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- All Implemented Interfaces:
java.io.Serializable
,java.lang.Comparable<BaseSingleFieldPeriod>
,ReadablePeriod
public final class Months extends BaseSingleFieldPeriod
An immutable time period representing a number of months.Months
is an immutable period that can only store months. It does not store years, days or hours for example. As such it is a type-safe way of representing a number of months in an application.The number of months is set in the constructor, and may be queried using
getMonths()
. Basic mathematical operations are provided -plus()
,minus()
,multipliedBy()
anddividedBy()
.Months
is thread-safe and immutable.- Since:
- 1.4
- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description static Months
EIGHT
Constant representing eight months.static Months
ELEVEN
Constant representing eleven months.static Months
FIVE
Constant representing five months.static Months
FOUR
Constant representing four months.static Months
MAX_VALUE
Constant representing the maximum number of months that can be stored in this object.static Months
MIN_VALUE
Constant representing the minimum number of months that can be stored in this object.static Months
NINE
Constant representing nine months.static Months
ONE
Constant representing one month.static Months
SEVEN
Constant representing seven months.static Months
SIX
Constant representing six months.static Months
TEN
Constant representing ten months.static Months
THREE
Constant representing three months.static Months
TWELVE
Constant representing twelve months.static Months
TWO
Constant representing two months.static Months
ZERO
Constant representing zero months.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description Months
dividedBy(int divisor)
Returns a new instance with the months divided by the specified divisor.DurationFieldType
getFieldType()
Gets the duration field type, which ismonths
.int
getMonths()
Gets the number of months that this period represents.PeriodType
getPeriodType()
Gets the period type, which ismonths
.boolean
isGreaterThan(Months other)
Is this months instance greater than the specified number of months.boolean
isLessThan(Months other)
Is this months instance less than the specified number of months.Months
minus(int months)
Returns a new instance with the specified number of months taken away.Months
minus(Months months)
Returns a new instance with the specified number of months taken away.static Months
months(int months)
Obtains an instance ofMonths
that may be cached.static Months
monthsBetween(ReadableInstant start, ReadableInstant end)
Creates aMonths
representing the number of whole months between the two specified datetimes.static Months
monthsBetween(ReadablePartial start, ReadablePartial end)
Creates aMonths
representing the number of whole months between the two specified partial datetimes.static Months
monthsIn(ReadableInterval interval)
Creates aMonths
representing the number of whole months in the specified interval.Months
multipliedBy(int scalar)
Returns a new instance with the months multiplied by the specified scalar.Months
negated()
Returns a new instance with the months value negated.static Months
parseMonths(java.lang.String periodStr)
Creates a newMonths
by parsing a string in the ISO8601 format 'PnM'.Months
plus(int months)
Returns a new instance with the specified number of months added.Months
plus(Months months)
Returns a new instance with the specified number of months added.java.lang.String
toString()
Gets this instance as a String in the ISO8601 duration format.-
Methods inherited from class org.joda.time.base.BaseSingleFieldPeriod
compareTo, equals, get, getFieldType, getValue, hashCode, isSupported, size, toMutablePeriod, toPeriod
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Field Detail
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ZERO
public static final Months ZERO
Constant representing zero months.
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ONE
public static final Months ONE
Constant representing one month.
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TWO
public static final Months TWO
Constant representing two months.
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THREE
public static final Months THREE
Constant representing three months.
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FOUR
public static final Months FOUR
Constant representing four months.
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FIVE
public static final Months FIVE
Constant representing five months.
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SIX
public static final Months SIX
Constant representing six months.
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SEVEN
public static final Months SEVEN
Constant representing seven months.
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EIGHT
public static final Months EIGHT
Constant representing eight months.
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NINE
public static final Months NINE
Constant representing nine months.
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TEN
public static final Months TEN
Constant representing ten months.
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ELEVEN
public static final Months ELEVEN
Constant representing eleven months.
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TWELVE
public static final Months TWELVE
Constant representing twelve months.
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MAX_VALUE
public static final Months MAX_VALUE
Constant representing the maximum number of months that can be stored in this object.
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MIN_VALUE
public static final Months MIN_VALUE
Constant representing the minimum number of months that can be stored in this object.
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Method Detail
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months
public static Months months(int months)
Obtains an instance ofMonths
that may be cached.Months
is immutable, so instances can be cached and shared. This factory method provides access to shared instances.- Parameters:
months
- the number of months to obtain an instance for- Returns:
- the instance of Months
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monthsBetween
public static Months monthsBetween(ReadableInstant start, ReadableInstant end)
Creates aMonths
representing the number of whole months between the two specified datetimes. This method correctly handles any daylight savings time changes that may occur during the interval.This method calculates by adding months to the start date until the result is past the end date. As such, a period from the end of a "long" month to the end of a "short" month is counted as a whole month.
- Parameters:
start
- the start instant, must not be nullend
- the end instant, must not be null- Returns:
- the period in months
- Throws:
java.lang.IllegalArgumentException
- if the instants are null or invalid
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monthsBetween
public static Months monthsBetween(ReadablePartial start, ReadablePartial end)
Creates aMonths
representing the number of whole months between the two specified partial datetimes.The two partials must contain the same fields, for example you can specify two
LocalDate
objects.This method calculates by adding months to the start date until the result is past the end date. As such, a period from the end of a "long" month to the end of a "short" month is counted as a whole month.
- Parameters:
start
- the start partial date, must not be nullend
- the end partial date, must not be null- Returns:
- the period in months
- Throws:
java.lang.IllegalArgumentException
- if the partials are null or invalid
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monthsIn
public static Months monthsIn(ReadableInterval interval)
Creates aMonths
representing the number of whole months in the specified interval. This method correctly handles any daylight savings time changes that may occur during the interval.- Parameters:
interval
- the interval to extract months from, null returns zero- Returns:
- the period in months
- Throws:
java.lang.IllegalArgumentException
- if the partials are null or invalid
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parseMonths
public static Months parseMonths(java.lang.String periodStr)
Creates a newMonths
by parsing a string in the ISO8601 format 'PnM'.The parse will accept the full ISO syntax of PnYnMnWnDTnHnMnS however only the months 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 months
- Throws:
java.lang.IllegalArgumentException
- if the string format is invalid
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getFieldType
public DurationFieldType getFieldType()
Gets the duration field type, which ismonths
.- Specified by:
getFieldType
in classBaseSingleFieldPeriod
- Returns:
- the period type
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getPeriodType
public PeriodType getPeriodType()
Gets the period type, which ismonths
.- Specified by:
getPeriodType
in interfaceReadablePeriod
- Specified by:
getPeriodType
in classBaseSingleFieldPeriod
- Returns:
- the period type
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getMonths
public int getMonths()
Gets the number of months that this period represents.- Returns:
- the number of months in the period
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plus
public Months plus(int months)
Returns a new instance with the specified number of months added.This instance is immutable and unaffected by this method call.
- Parameters:
months
- the amount of months to add, may be negative- Returns:
- the new period plus the specified number of months
- Throws:
java.lang.ArithmeticException
- if the result overflows an int
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plus
public Months plus(Months months)
Returns a new instance with the specified number of months added.This instance is immutable and unaffected by this method call.
- Parameters:
months
- the amount of months to add, may be negative, null means zero- Returns:
- the new period plus the specified number of months
- Throws:
java.lang.ArithmeticException
- if the result overflows an int
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minus
public Months minus(int months)
Returns a new instance with the specified number of months taken away.This instance is immutable and unaffected by this method call.
- Parameters:
months
- the amount of months to take away, may be negative- Returns:
- the new period minus the specified number of months
- Throws:
java.lang.ArithmeticException
- if the result overflows an int
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minus
public Months minus(Months months)
Returns a new instance with the specified number of months taken away.This instance is immutable and unaffected by this method call.
- Parameters:
months
- the amount of months to take away, may be negative, null means zero- Returns:
- the new period minus the specified number of months
- Throws:
java.lang.ArithmeticException
- if the result overflows an int
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multipliedBy
public Months multipliedBy(int scalar)
Returns a new instance with the months 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:
java.lang.ArithmeticException
- if the result overflows an int
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dividedBy
public Months dividedBy(int divisor)
Returns a new instance with the months 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:
java.lang.ArithmeticException
- if the divisor is zero
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negated
public Months negated()
Returns a new instance with the months value negated.- Returns:
- the new period with a negated value
- Throws:
java.lang.ArithmeticException
- if the result overflows an int
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isGreaterThan
public boolean isGreaterThan(Months other)
Is this months instance greater than the specified number of months.- Parameters:
other
- the other period, null means zero- Returns:
- true if this months instance is greater than the specified one
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isLessThan
public boolean isLessThan(Months other)
Is this months instance less than the specified number of months.- Parameters:
other
- the other period, null means zero- Returns:
- true if this months instance is less than the specified one
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toString
public java.lang.String toString()
Gets this instance as a String in the ISO8601 duration format.For example, "P4M" represents 4 months.
- Specified by:
toString
in interfaceReadablePeriod
- Overrides:
toString
in classjava.lang.Object
- Returns:
- the value as an ISO8601 string
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