Months (Joda time 2.2 API)

java.lang.Object
- org.joda.time.base.BaseSingleFieldPeriod
- - org.joda.time.Months

All Implemented Interfaces:

Serializable, 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() and dividedBy().
Months is thread-safe and immutable.

Since:

1.4

Author:

Stephen Colebourne

See Also:
Serialized Form

Field Summary

Fields
Modifier and Type	Field and 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.

Method Summary

Methods
Modifier and Type	Method and 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 is `months`.
`int`	`getMonths()` Gets the number of months that this period represents.
`PeriodType`	`getPeriodType()` Gets the period type, which is `months`.
`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 of `Months` that may be cached.
`static Months`	`monthsBetween(ReadableInstant start, ReadableInstant end)` Creates a `Months` representing the number of whole months between the two specified datetimes.
`static Months`	`monthsBetween(ReadablePartial start, ReadablePartial end)` Creates a `Months` representing the number of whole months between the two specified partial datetimes.
`static Months`	`monthsIn(ReadableInterval interval)` Creates a `Months` 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(String periodStr)` Creates a new `Months` 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.
`String`	`toString()` Gets this instance as a String in the ISO8601 duration format.

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 Months ZERO
```
    Constant representing zero months.
  - ONE
```
public static final Months ONE
```
    Constant representing one month.
  - TWO
```
public static final Months TWO
```
    Constant representing two months.
  - THREE
```
public static final Months THREE
```
    Constant representing three months.
  - FOUR
```
public static final Months FOUR
```
    Constant representing four months.
  - FIVE
```
public static final Months FIVE
```
    Constant representing five months.
  - SIX
```
public static final Months SIX
```
    Constant representing six months.
  - SEVEN
```
public static final Months SEVEN
```
    Constant representing seven months.
  - EIGHT
```
public static final Months EIGHT
```
    Constant representing eight months.
  - NINE
```
public static final Months NINE
```
    Constant representing nine months.
  - TEN
```
public static final Months TEN
```
    Constant representing ten months.
  - ELEVEN
```
public static final Months ELEVEN
```
    Constant representing eleven months.
  - TWELVE
```
public static final Months TWELVE
```
    Constant representing twelve months.
  - MAX_VALUE
```
public static final Months MAX_VALUE
```
    Constant representing the maximum number of months that can be stored in this object.
  - MIN_VALUE
```
public static final Months MIN_VALUE
```
    Constant representing the minimum number of months that can be stored in this object.
- Method Detail
  - months
```
public static Months months(int months)
```
    Obtains an instance of Months 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
  - monthsBetween
```
public static Months monthsBetween(ReadableInstant start,
                   ReadableInstant end)
```
    Creates a Months representing the number of whole months 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 months
    
    Throws:
    
    IllegalArgumentException - if the instants are null or invalid
  - monthsBetween
```
public static Months monthsBetween(ReadablePartial start,
                   ReadablePartial end)
```
    Creates a Months 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.
    
    Parameters:
    start - the start partial date, must not be null
    end - the end partial date, must not be null
    
    Returns:
    the period in months
    
    Throws:
    
    IllegalArgumentException - if the partials are null or invalid
  - monthsIn
```
public static Months monthsIn(ReadableInterval interval)
```
    Creates a Months representing the number of whole months 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 months from, null returns zero
    
    Returns:
    the period in months
    
    Throws:
    
    IllegalArgumentException - if the partials are null or invalid
  - parseMonths
```
public static Months parseMonths(String periodStr)
```
    Creates a new Months 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:
    
    IllegalArgumentException - if the string format is invalid
  - getFieldType
```
public DurationFieldType getFieldType()
```
    Gets the duration field type, which is months.
    
    Specified by:
    
    getFieldType in class BaseSingleFieldPeriod
    
    Returns:
    the period type
  - getPeriodType
```
public PeriodType getPeriodType()
```
    Gets the period type, which is months.
    
    Specified by:
    
    getPeriodType in interface ReadablePeriod
    
    Specified by:
    
    getPeriodType in class BaseSingleFieldPeriod
    
    Returns:
    the period type
  - getMonths
```
public int getMonths()
```
    Gets the number of months that this period represents.
    
    Returns:
    the number of months in the period
  - 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:
    
    ArithmeticException - if the result overflows an int
  - 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:
    
    ArithmeticException - if the result overflows an int
  - 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:
    
    ArithmeticException - if the result overflows an int
  - 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:
    
    ArithmeticException - if the result overflows an int
  - 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:
    
    ArithmeticException - if the result overflows an int
  - 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:
    
    ArithmeticException - if the divisor is zero
  - negated
```
public Months negated()
```
    Returns a new instance with the months value negated.
    
    Returns:
    the new period with a negated value
    
    Throws:
    
    ArithmeticException - if the result overflows an int
  - 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
  - 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
  - toString
```
public String toString()
```
    Gets this instance as a String in the ISO8601 duration format.
    For example, "P4M" represents 4 months.
    
    Specified by:
    
    toString in interface ReadablePeriod
    
    Overrides:
    
    toString in class Object
    
    Returns:
    the value as an ISO8601 string

Class Months

Field Summary

Method Summary

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

Methods inherited from class java.lang.Object

Field Detail

ZERO

ONE

TWO

THREE

FOUR

FIVE

SIX

SEVEN

EIGHT

NINE

TEN

ELEVEN

TWELVE

MAX_VALUE

MIN_VALUE

Method Detail

months

monthsBetween

monthsBetween

monthsIn

parseMonths

getFieldType

getPeriodType

getMonths

plus

plus

minus

minus

multipliedBy

dividedBy

negated

isGreaterThan

isLessThan

toString