public final class Weeks extends Object implements TemporalAmount, Comparable<Weeks>, Serializable
This class models a quantity or amount of time in terms of weeks. It is a typesafe way of representing a number of weeks in an application.
The model is of a directed amount, meaning that the amount may be negative.
This class must be treated as a value type. Do not synchronize, rely on the identity hash code or use the distinction between equals() and ==.
Modifier and Type  Field and Description 

static Weeks 
ONE
A constant for one week.

static Weeks 
ZERO
A constant for zero weeks.

Modifier and Type  Method and Description 

Weeks 
abs()
Returns a copy of this duration with a positive length.

Temporal 
addTo(Temporal temporal)
Adds this amount to the specified temporal object.

static Weeks 
between(Temporal startDateInclusive,
Temporal endDateExclusive)
Obtains a
Weeks consisting of the number of weeks between two dates. 
int 
compareTo(Weeks otherAmount)
Compares this amount to the specified
Weeks . 
Weeks 
dividedBy(int divisor)
Returns an instance with the amount divided by the specified divisor.

boolean 
equals(Object otherAmount)
Checks if this amount is equal to the specified
Weeks . 
static Weeks 
from(TemporalAmount amount)
Obtains an instance of
Weeks from a temporal amount. 
long 
get(TemporalUnit unit)
Gets the value of the requested unit.

int 
getAmount()
Gets the number of weeks in this amount.

List<TemporalUnit> 
getUnits()
Gets the set of units supported by this amount.

int 
hashCode()
A hash code for this amount.

Weeks 
minus(int weeks)
Returns a copy of this amount with the specified number of weeks subtracted.

Weeks 
minus(TemporalAmount amountToAdd)
Returns a copy of this amount with the specified amount subtracted.

Weeks 
multipliedBy(int scalar)
Returns an instance with the amount multiplied by the specified scalar.

Weeks 
negated()
Returns an instance with the amount negated.

static Weeks 
of(int weeks)
Obtains a
Weeks representing a number of weeks. 
static Weeks 
parse(CharSequence text)
Obtains a
Weeks from a text string such as PnW . 
Weeks 
plus(int weeks)
Returns a copy of this amount with the specified number of weeks added.

Weeks 
plus(TemporalAmount amountToAdd)
Returns a copy of this amount with the specified amount added.

Temporal 
subtractFrom(Temporal temporal)
Subtracts this amount from the specified temporal object.

Period 
toPeriod()
Gets the number of weeks as a
Period . 
String 
toString()
Returns a string representation of the number of weeks.

public static final Weeks ZERO
public static final Weeks ONE
public static Weeks of(int weeks)
Weeks
representing a number of weeks.
The resulting amount will have the specified weeks.
weeks
 the number of weeks, positive or negativepublic static Weeks from(TemporalAmount amount)
Weeks
from a temporal amount.
This obtains an instance based on the specified amount.
A TemporalAmount
represents an amount of time, which may be
datebased or timebased, which this factory extracts to a Weeks
.
The result is calculated by looping around each unit in the specified amount.
Each amount is converted to weeks using Temporals.convertAmount(long, java.time.temporal.TemporalUnit, java.time.temporal.TemporalUnit)
.
If the conversion yields a remainder, an exception is thrown.
If the amount is zero, the unit is ignored.
For example, "7 days" can be converted to weeks but "6 days" cannot.
amount
 the temporal amount to convert, not nullDateTimeException
 if unable to convert to a Weeks
ArithmeticException
 if numeric overflow occurspublic static Weeks parse(CharSequence text)
Weeks
from a text string such as PnW
.
This will parse the string produced by toString()
which is
based on the ISO8601 period formats PnW
.
The string starts with an optional sign, denoted by the ASCII negative or positive symbol. If negative, the whole amount is negated. The ASCII letter "P" is next in upper or lower case. The ASCII integer amount is next, which may be negative. The ASCII letter "W" is next in upper or lower case.
The leading plus/minus sign, and negative values for weeks are not part of the ISO8601 standard.
For example, the following are valid inputs:
"P2W"  Weeks.of(2) "P2W"  Weeks.of(2) "P2W"  Weeks.of(2) "P2W"  Weeks.of(2)
text
 the text to parse, not nullDateTimeParseException
 if the text cannot be parsed to a periodpublic static Weeks between(Temporal startDateInclusive, Temporal endDateExclusive)
Weeks
consisting of the number of weeks between two dates.
The start date is included, but the end date is not. The result of this method can be negative if the end is before the start.
startDateInclusive
 the start date, inclusive, not nullendDateExclusive
 the end date, exclusive, not nullpublic long get(TemporalUnit unit)
This returns a value for the supported unit  WEEKS
.
All other units throw an exception.
get
in interface TemporalAmount
unit
 the TemporalUnit
for which to return the valueUnsupportedTemporalTypeException
 if the unit is not supportedpublic List<TemporalUnit> getUnits()
The single supported unit is WEEKS
.
This set can be used in conjunction with get(TemporalUnit)
to access the entire state of the amount.
getUnits
in interface TemporalAmount
public int getAmount()
public Weeks plus(TemporalAmount amountToAdd)
The parameter is converted using from(TemporalAmount)
.
This instance is immutable and unaffected by this method call.
amountToAdd
 the amount to add, not nullWeeks
based on this instance with the requested amount added, not nullDateTimeException
 if the specified amount contains an invalid unitArithmeticException
 if numeric overflow occurspublic Weeks plus(int weeks)
This instance is immutable and unaffected by this method call.
weeks
 the amount of weeks to add, may be negativeWeeks
based on this instance with the requested amount added, not nullArithmeticException
 if the result overflows an intpublic Weeks minus(TemporalAmount amountToAdd)
The parameter is converted using from(TemporalAmount)
.
This instance is immutable and unaffected by this method call.
amountToAdd
 the amount to add, not nullWeeks
based on this instance with the requested amount subtracted, not nullDateTimeException
 if the specified amount contains an invalid unitArithmeticException
 if numeric overflow occurspublic Weeks minus(int weeks)
This instance is immutable and unaffected by this method call.
weeks
 the amount of weeks to add, may be negativeWeeks
based on this instance with the requested amount subtracted, not nullArithmeticException
 if the result overflows an intpublic Weeks multipliedBy(int scalar)
This instance is immutable and unaffected by this method call.
scalar
 the scalar to multiply by, not nullArithmeticException
 if numeric overflow occurspublic Weeks dividedBy(int divisor)
The calculation uses integer division, thus 3 divided by 2 is 1.
This instance is immutable and unaffected by this method call.
divisor
 the amount to divide by, may be negativeArithmeticException
 if the divisor is zeropublic Weeks negated()
This instance is immutable and unaffected by this method call.
ArithmeticException
 if numeric overflow occurs, which only happens if
the amount is Long.MIN_VALUE
public Weeks abs()
This method returns a positive duration by effectively removing the sign from any negative total length.
This instance is immutable and unaffected by this method call.
ArithmeticException
 if numeric overflow occurs, which only happens if
the amount is Long.MIN_VALUE
public Period toPeriod()
Period
.
This returns a period with the same number of weeks.
public Temporal addTo(Temporal temporal)
This returns a temporal object of the same observable type as the input with this amount added.
In most cases, it is clearer to reverse the calling pattern by using
Temporal.plus(TemporalAmount)
.
// these two lines are equivalent, but the second approach is recommended dateTime = thisAmount.addTo(dateTime); dateTime = dateTime.plus(thisAmount);
Only nonzero amounts will be added.
This instance is immutable and unaffected by this method call.
addTo
in interface TemporalAmount
temporal
 the temporal object to adjust, not nullDateTimeException
 if unable to addUnsupportedTemporalTypeException
 if the WEEKS unit is not supportedArithmeticException
 if numeric overflow occurspublic Temporal subtractFrom(Temporal temporal)
This returns a temporal object of the same observable type as the input with this amount subtracted.
In most cases, it is clearer to reverse the calling pattern by using
Temporal.minus(TemporalAmount)
.
// these two lines are equivalent, but the second approach is recommended dateTime = thisAmount.subtractFrom(dateTime); dateTime = dateTime.minus(thisAmount);
Only nonzero amounts will be subtracted.
This instance is immutable and unaffected by this method call.
subtractFrom
in interface TemporalAmount
temporal
 the temporal object to adjust, not nullDateTimeException
 if unable to subtractUnsupportedTemporalTypeException
 if the WEEKS unit is not supportedArithmeticException
 if numeric overflow occurspublic int compareTo(Weeks otherAmount)
Weeks
.
The comparison is based on the total length of the amounts.
It is "consistent with equals", as defined by Comparable
.
compareTo
in interface Comparable<Weeks>
otherAmount
 the other amount, not nullpublic boolean equals(Object otherAmount)
Weeks
.
The comparison is based on the total length of the durations.
public int hashCode()
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