Java compact1, compact2, compact3 java.time Class Duration（JDK8）

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Java™ Platform
Standard Ed. 8

All Classes

Summary:
Nested |
Field |
Constr |
Method

Detail:
Field |
Constr |
Method

java.lang.Object
- java.time.Duration

All Implemented Interfaces:

Serializable, Comparable<Duration>, TemporalAmount
```
public final class Duration
extends Object
implements TemporalAmount, Comparable<Duration>, Serializable
```
A time-based amount of time, such as '34.5 seconds'.
This class models a quantity or amount of time in terms of seconds and nanoseconds. It can be accessed using other duration-based units, such as minutes and hours. In addition, the DAYS unit can be used and is treated as exactly equal to 24 hours, thus ignoring daylight savings effects. See Period for the date-based equivalent to this class.

A physical duration could be of infinite length. For practicality, the duration is stored with constraints similar to Instant. The duration uses nanosecond resolution with a maximum value of the seconds that can be held in a long. This is greater than the current estimated age of the universe.

The range of a duration requires the storage of a number larger than a long. To achieve this, the class stores a long representing seconds and an int representing nanosecond-of-second, which will always be between 0 and 999,999,999. The model is of a directed duration, meaning that the duration may be negative.

The duration is measured in "seconds", but these are not necessarily identical to the scientific "SI second" definition based on atomic clocks. This difference only impacts durations measured near a leap-second and should not affect most applications. See Instant for a discussion as to the meaning of the second and time-scales.

This is a value-based class; use of identity-sensitive operations (including reference equality (==), identity hash code, or synchronization) on instances of Duration may have unpredictable results and should be avoided. The equals method should be used for comparisons.

Implementation Requirements:

This class is immutable and thread-safe.

Since:

1.8

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`static Duration`	`ZERO` Constant for a duration of zero.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Duration`	`abs()` Returns a copy of this duration with a positive length.
`Temporal`	`addTo(Temporal temporal)` Adds this duration to the specified temporal object.
`static Duration`	`between(Temporal startInclusive, Temporal endExclusive)` Obtains a `Duration` representing the duration between two temporal objects.
`int`	`compareTo(Duration otherDuration)` Compares this duration to the specified `Duration`.
`Duration`	`dividedBy(long divisor)` Returns a copy of this duration divided by the specified value.
`boolean`	`equals(Object otherDuration)` Checks if this duration is equal to the specified `Duration`.
`static Duration`	`from(TemporalAmount amount)` Obtains an instance of `Duration` from a temporal amount.
`long`	`get(TemporalUnit unit)` Gets the value of the requested unit.
`int`	`getNano()` Gets the number of nanoseconds within the second in this duration.
`long`	`getSeconds()` Gets the number of seconds in this duration.
`List<TemporalUnit>`	`getUnits()` Gets the set of units supported by this duration.
`int`	`hashCode()` A hash code for this duration.
`boolean`	`isNegative()` Checks if this duration is negative, excluding zero.
`boolean`	`isZero()` Checks if this duration is zero length.
`Duration`	`minus(Duration duration)` Returns a copy of this duration with the specified duration subtracted.
`Duration`	`minus(long amountToSubtract, TemporalUnit unit)` Returns a copy of this duration with the specified duration subtracted.
`Duration`	`minusDays(long daysToSubtract)` Returns a copy of this duration with the specified duration in standard 24 hour days subtracted.
`Duration`	`minusHours(long hoursToSubtract)` Returns a copy of this duration with the specified duration in hours subtracted.
`Duration`	`minusMillis(long millisToSubtract)` Returns a copy of this duration with the specified duration in milliseconds subtracted.
`Duration`	`minusMinutes(long minutesToSubtract)` Returns a copy of this duration with the specified duration in minutes subtracted.
`Duration`	`minusNanos(long nanosToSubtract)` Returns a copy of this duration with the specified duration in nanoseconds subtracted.
`Duration`	`minusSeconds(long secondsToSubtract)` Returns a copy of this duration with the specified duration in seconds subtracted.
`Duration`	`multipliedBy(long multiplicand)` Returns a copy of this duration multiplied by the scalar.
`Duration`	`negated()` Returns a copy of this duration with the length negated.
`static Duration`	`of(long amount, TemporalUnit unit)` Obtains a `Duration` representing an amount in the specified unit.
`static Duration`	`ofDays(long days)` Obtains a `Duration` representing a number of standard 24 hour days.
`static Duration`	`ofHours(long hours)` Obtains a `Duration` representing a number of standard hours.
`static Duration`	`ofMillis(long millis)` Obtains a `Duration` representing a number of milliseconds.
`static Duration`	`ofMinutes(long minutes)` Obtains a `Duration` representing a number of standard minutes.
`static Duration`	`ofNanos(long nanos)` Obtains a `Duration` representing a number of nanoseconds.
`static Duration`	`ofSeconds(long seconds)` Obtains a `Duration` representing a number of seconds.
`static Duration`	`ofSeconds(long seconds, long nanoAdjustment)` Obtains a `Duration` representing a number of seconds and an adjustment in nanoseconds.
`static Duration`	`parse(CharSequence text)` Obtains a `Duration` from a text string such as `PnDTnHnMn.nS`.
`Duration`	`plus(Duration duration)` Returns a copy of this duration with the specified duration added.
`Duration`	`plus(long amountToAdd, TemporalUnit unit)` Returns a copy of this duration with the specified duration added.
`Duration`	`plusDays(long daysToAdd)` Returns a copy of this duration with the specified duration in standard 24 hour days added.
`Duration`	`plusHours(long hoursToAdd)` Returns a copy of this duration with the specified duration in hours added.
`Duration`	`plusMillis(long millisToAdd)` Returns a copy of this duration with the specified duration in milliseconds added.
`Duration`	`plusMinutes(long minutesToAdd)` Returns a copy of this duration with the specified duration in minutes added.
`Duration`	`plusNanos(long nanosToAdd)` Returns a copy of this duration with the specified duration in nanoseconds added.
`Duration`	`plusSeconds(long secondsToAdd)` Returns a copy of this duration with the specified duration in seconds added.
`Temporal`	`subtractFrom(Temporal temporal)` Subtracts this duration from the specified temporal object.
`long`	`toDays()` Gets the number of days in this duration.
`long`	`toHours()` Gets the number of hours in this duration.
`long`	`toMillis()` Converts this duration to the total length in milliseconds.
`long`	`toMinutes()` Gets the number of minutes in this duration.
`long`	`toNanos()` Converts this duration to the total length in nanoseconds expressed as a `long`.
`String`	`toString()` A string representation of this duration using ISO-8601 seconds based representation, such as `PT8H6M12.345S`.
`Duration`	`withNanos(int nanoOfSecond)` Returns a copy of this duration with the specified nano-of-second.
`Duration`	`withSeconds(long seconds)` Returns a copy of this duration with the specified amount of seconds.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - ZERO
```
public static final Duration ZERO
```
    Constant for a duration of zero.
- Method Detail
  - ofDays
```
public static Duration ofDays(long days)
```
    Obtains a Duration representing a number of standard 24 hour days.
    The seconds are calculated based on the standard definition of a day, where each day is 86400 seconds which implies a 24 hour day. The nanosecond in second field is set to zero.
    
    Parameters:
    
    days - the number of days, positive or negative
    
    Returns:
    
    a Duration, not null
    
    Throws:
    
    ArithmeticException - if the input days exceeds the capacity of Duration
  - ofHours
```
public static Duration ofHours(long hours)
```
    Obtains a Duration representing a number of standard hours.
    The seconds are calculated based on the standard definition of an hour, where each hour is 3600 seconds. The nanosecond in second field is set to zero.
    
    Parameters:
    
    hours - the number of hours, positive or negative
    
    Returns:
    
    a Duration, not null
    
    Throws:
    
    ArithmeticException - if the input hours exceeds the capacity of Duration
  - ofMinutes
```
public static Duration ofMinutes(long minutes)
```
    Obtains a Duration representing a number of standard minutes.
    The seconds are calculated based on the standard definition of a minute, where each minute is 60 seconds. The nanosecond in second field is set to zero.
    
    Parameters:
    
    minutes - the number of minutes, positive or negative
    
    Returns:
    
    a Duration, not null
    
    Throws:
    
    ArithmeticException - if the input minutes exceeds the capacity of Duration
  - ofSeconds
```
public static Duration ofSeconds(long seconds)
```
    Obtains a Duration representing a number of seconds.
    The nanosecond in second field is set to zero.
    
    Parameters:
    
    seconds - the number of seconds, positive or negative
    
    Returns:
    
    a Duration, not null
  - ofSeconds
```
public static Duration ofSeconds(long seconds,
                                 long nanoAdjustment)
```
    Obtains a Duration representing a number of seconds and an adjustment in nanoseconds.
    This method allows an arbitrary number of nanoseconds to be passed in. The factory will alter the values of the second and nanosecond in order to ensure that the stored nanosecond is in the range 0 to 999,999,999. For example, the following will result in the exactly the same duration:
```
  Duration.ofSeconds(3, 1);
  Duration.ofSeconds(4, -999_999_999);
  Duration.ofSeconds(2, 1000_000_001);
 
```
    Parameters:
    
    seconds - the number of seconds, positive or negative
    
    nanoAdjustment - the nanosecond adjustment to the number of seconds, positive or negative
    
    Returns:
    
    a Duration, not null
    
    Throws:
    
    ArithmeticException - if the adjustment causes the seconds to exceed the capacity of Duration
  - ofMillis
```
public static Duration ofMillis(long millis)
```
    Obtains a Duration representing a number of milliseconds.
    The seconds and nanoseconds are extracted from the specified milliseconds.
    
    Parameters:
    
    millis - the number of milliseconds, positive or negative
    
    Returns:
    
    a Duration, not null
  - ofNanos
```
public static Duration ofNanos(long nanos)
```
    Obtains a Duration representing a number of nanoseconds.
    The seconds and nanoseconds are extracted from the specified nanoseconds.
    
    Parameters:
    
    nanos - the number of nanoseconds, positive or negative
    
    Returns:
    
    a Duration, not null
  - of
```
public static Duration of(long amount,
                          TemporalUnit unit)
```
    Obtains a Duration representing an amount in the specified unit.
    The parameters represent the two parts of a phrase like '6 Hours'. For example:
```
  Duration.of(3, SECONDS);
  Duration.of(465, HOURS);
 
```
    Only a subset of units are accepted by this method. The unit must either have an exact duration or be ChronoUnit.DAYS which is treated as 24 hours. Other units throw an exception.
    Parameters:
    
    amount - the amount of the duration, measured in terms of the unit, positive or negative
    
    unit - the unit that the duration is measured in, must have an exact duration, not null
    
    Returns:
    
    a Duration, not null
    
    Throws:
    
    DateTimeException - if the period unit has an estimated duration
    
    ArithmeticException - if a numeric overflow occurs
  - from
```
public static Duration from(TemporalAmount amount)
```
    Obtains an instance of Duration from a temporal amount.
    This obtains a duration based on the specified amount. A TemporalAmount represents an amount of time, which may be date-based or time-based, which this factory extracts to a duration.
    
    The conversion loops around the set of units from the amount and uses the duration of the unit to calculate the total Duration. Only a subset of units are accepted by this method. The unit must either have an exact duration or be ChronoUnit.DAYS which is treated as 24 hours. If any other units are found then an exception is thrown.
    
    Parameters:
    
    amount - the temporal amount to convert, not null
    
    Returns:
    
    the equivalent duration, not null
    
    Throws:
    
    DateTimeException - if unable to convert to a Duration
    
    ArithmeticException - if numeric overflow occurs
  - parse
```
public static Duration parse(CharSequence text)
```
    Obtains a Duration from a text string such as PnDTnHnMn.nS.
    This will parse a textual representation of a duration, including the string produced by toString(). The formats accepted are based on the ISO-8601 duration format PnDTnHnMn.nS with days considered to be exactly 24 hours.
    
    The string starts with an optional sign, denoted by the ASCII negative or positive symbol. If negative, the whole period is negated. The ASCII letter "P" is next in upper or lower case. There are then four sections, each consisting of a number and a suffix. The sections have suffixes in ASCII of "D", "H", "M" and "S" for days, hours, minutes and seconds, accepted in upper or lower case. The suffixes must occur in order. The ASCII letter "T" must occur before the first occurrence, if any, of an hour, minute or second section. At least one of the four sections must be present, and if "T" is present there must be at least one section after the "T". The number part of each section must consist of one or more ASCII digits. The number may be prefixed by the ASCII negative or positive symbol. The number of days, hours and minutes must parse to an long. The number of seconds must parse to an long with optional fraction. The decimal point may be either a dot or a comma. The fractional part may have from zero to 9 digits.
    
    The leading plus/minus sign, and negative values for other units are not part of the ISO-8601 standard.
    
    Examples:
```
    "PT20.345S" -- parses as "20.345 seconds"
    "PT15M"     -- parses as "15 minutes" (where a minute is 60 seconds)
    "PT10H"     -- parses as "10 hours" (where an hour is 3600 seconds)
    "P2D"       -- parses as "2 days" (where a day is 24 hours or 86400 seconds)
    "P2DT3H4M"  -- parses as "2 days, 3 hours and 4 minutes"
    "P-6H3M"    -- parses as "-6 hours and +3 minutes"
    "-P6H3M"    -- parses as "-6 hours and -3 minutes"
    "-P-6H+3M"  -- parses as "+6 hours and -3 minutes"
 
```
    Parameters:
    
    text - the text to parse, not null
    
    Returns:
    
    the parsed duration, not null
    
    Throws:
    
    DateTimeParseException - if the text cannot be parsed to a duration
  - between
```
public static Duration between(Temporal startInclusive,
                               Temporal endExclusive)
```
    Obtains a Duration representing the duration between two temporal objects.
    This calculates the duration between two temporal objects. If the objects are of different types, then the duration is calculated based on the type of the first object. For example, if the first argument is a LocalTime then the second argument is converted to a LocalTime.
    
    The specified temporal objects must support the SECONDS unit. For full accuracy, either the NANOS unit or the NANO_OF_SECOND field should be supported.
    
    The result of this method can be a negative period if the end is before the start. To guarantee to obtain a positive duration call abs() on the result.
    
    Parameters:
    
    startInclusive - the start instant, inclusive, not null
    
    endExclusive - the end instant, exclusive, not null
    
    Returns:
    
    a Duration, not null
    
    Throws:
    
    DateTimeException - if the seconds between the temporals cannot be obtained
    
    ArithmeticException - if the calculation exceeds the capacity of Duration
  - get
```
public long get(TemporalUnit unit)
```
    Gets the value of the requested unit.
    This returns a value for each of the two supported units, SECONDS and NANOS. All other units throw an exception.
    
    Specified by:
    
    get in interface TemporalAmount
    
    Parameters:
    
    unit - the TemporalUnit for which to return the value
    
    Returns:
    
    the long value of the unit
    
    Throws:
    
    DateTimeException - if the unit is not supported
    
    UnsupportedTemporalTypeException - if the unit is not supported
  - getUnits
```
public List<TemporalUnit> getUnits()
```
    Gets the set of units supported by this duration.
    The supported units are SECONDS, and NANOS. They are returned in the order seconds, nanos.
    
    This set can be used in conjunction with get(TemporalUnit) to access the entire state of the duration.
    
    Specified by:
    
    getUnits in interface TemporalAmount
    
    Returns:
    
    a list containing the seconds and nanos units, not null
  - isZero
```
public boolean isZero()
```
    Checks if this duration is zero length.
    A Duration represents a directed distance between two points on the time-line and can therefore be positive, zero or negative. This method checks whether the length is zero.
    
    Returns:
    
    true if this duration has a total length equal to zero
  - isNegative
```
public boolean isNegative()
```
    Checks if this duration is negative, excluding zero.
    A Duration represents a directed distance between two points on the time-line and can therefore be positive, zero or negative. This method checks whether the length is less than zero.
    
    Returns:
    
    true if this duration has a total length less than zero
  - getSeconds
```
public long getSeconds()
```
    Gets the number of seconds in this duration.
    The length of the duration is stored using two fields - seconds and nanoseconds. The nanoseconds part is a value from 0 to 999,999,999 that is an adjustment to the length in seconds. The total duration is defined by calling this method and getNano().
    
    A Duration represents a directed distance between two points on the time-line. A negative duration is expressed by the negative sign of the seconds part. A duration of -1 nanosecond is stored as -1 seconds plus 999,999,999 nanoseconds.
    
    Returns:
    
    the whole seconds part of the length of the duration, positive or negative
  - getNano
```
public int getNano()
```
    Gets the number of nanoseconds within the second in this duration.
    The length of the duration is stored using two fields - seconds and nanoseconds. The nanoseconds part is a value from 0 to 999,999,999 that is an adjustment to the length in seconds. The total duration is defined by calling this method and getSeconds().
    
    A Duration represents a directed distance between two points on the time-line. A negative duration is expressed by the negative sign of the seconds part. A duration of -1 nanosecond is stored as -1 seconds plus 999,999,999 nanoseconds.
    
    Returns:
    
    the nanoseconds within the second part of the length of the duration, from 0 to 999,999,999
  - withSeconds
```
public Duration withSeconds(long seconds)
```
    Returns a copy of this duration with the specified amount of seconds.
    This returns a duration with the specified seconds, retaining the nano-of-second part of this duration.
    
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    seconds - the seconds to represent, may be negative
    
    Returns:
    
    a Duration based on this period with the requested seconds, not null
  - withNanos
```
public Duration withNanos(int nanoOfSecond)
```
    Returns a copy of this duration with the specified nano-of-second.
    This returns a duration with the specified nano-of-second, retaining the seconds part of this duration.
    
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    nanoOfSecond - the nano-of-second to represent, from 0 to 999,999,999
    
    Returns:
    
    a Duration based on this period with the requested nano-of-second, not null
    
    Throws:
    
    DateTimeException - if the nano-of-second is invalid
  - plus
```
public Duration plus(Duration duration)
```
    Returns a copy of this duration with the specified duration added.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    duration - the duration to add, positive or negative, not null
    
    Returns:
    
    a Duration based on this duration with the specified duration added, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - plus
```
public Duration plus(long amountToAdd,
                     TemporalUnit unit)
```
    Returns a copy of this duration with the specified duration added.
    The duration amount is measured in terms of the specified unit. Only a subset of units are accepted by this method. The unit must either have an exact duration or be ChronoUnit.DAYS which is treated as 24 hours. Other units throw an exception.
    
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    amountToAdd - the amount to add, measured in terms of the unit, positive or negative
    
    unit - the unit that the amount is measured in, must have an exact duration, not null
    
    Returns:
    
    a Duration based on this duration with the specified duration added, not null
    
    Throws:
    
    UnsupportedTemporalTypeException - if the unit is not supported
    
    ArithmeticException - if numeric overflow occurs
  - plusDays
```
public Duration plusDays(long daysToAdd)
```
    Returns a copy of this duration with the specified duration in standard 24 hour days added.
    The number of days is multiplied by 86400 to obtain the number of seconds to add. This is based on the standard definition of a day as 24 hours.
    
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    daysToAdd - the days to add, positive or negative
    
    Returns:
    
    a Duration based on this duration with the specified days added, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - plusHours
```
public Duration plusHours(long hoursToAdd)
```
    Returns a copy of this duration with the specified duration in hours added.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    hoursToAdd - the hours to add, positive or negative
    
    Returns:
    
    a Duration based on this duration with the specified hours added, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - plusMinutes
```
public Duration plusMinutes(long minutesToAdd)
```
    Returns a copy of this duration with the specified duration in minutes added.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    minutesToAdd - the minutes to add, positive or negative
    
    Returns:
    
    a Duration based on this duration with the specified minutes added, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - plusSeconds
```
public Duration plusSeconds(long secondsToAdd)
```
    Returns a copy of this duration with the specified duration in seconds added.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    secondsToAdd - the seconds to add, positive or negative
    
    Returns:
    
    a Duration based on this duration with the specified seconds added, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - plusMillis
```
public Duration plusMillis(long millisToAdd)
```
    Returns a copy of this duration with the specified duration in milliseconds added.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    millisToAdd - the milliseconds to add, positive or negative
    
    Returns:
    
    a Duration based on this duration with the specified milliseconds added, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - plusNanos
```
public Duration plusNanos(long nanosToAdd)
```
    Returns a copy of this duration with the specified duration in nanoseconds added.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    nanosToAdd - the nanoseconds to add, positive or negative
    
    Returns:
    
    a Duration based on this duration with the specified nanoseconds added, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - minus
```
public Duration minus(Duration duration)
```
    Returns a copy of this duration with the specified duration subtracted.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    duration - the duration to subtract, positive or negative, not null
    
    Returns:
    
    a Duration based on this duration with the specified duration subtracted, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - minus
```
public Duration minus(long amountToSubtract,
                      TemporalUnit unit)
```
    Returns a copy of this duration with the specified duration subtracted.
    The duration amount is measured in terms of the specified unit. Only a subset of units are accepted by this method. The unit must either have an exact duration or be ChronoUnit.DAYS which is treated as 24 hours. Other units throw an exception.
    
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    amountToSubtract - the amount to subtract, measured in terms of the unit, positive or negative
    
    unit - the unit that the amount is measured in, must have an exact duration, not null
    
    Returns:
    
    a Duration based on this duration with the specified duration subtracted, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - minusDays
```
public Duration minusDays(long daysToSubtract)
```
    Returns a copy of this duration with the specified duration in standard 24 hour days subtracted.
    The number of days is multiplied by 86400 to obtain the number of seconds to subtract. This is based on the standard definition of a day as 24 hours.
    
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    daysToSubtract - the days to subtract, positive or negative
    
    Returns:
    
    a Duration based on this duration with the specified days subtracted, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - minusHours
```
public Duration minusHours(long hoursToSubtract)
```
    Returns a copy of this duration with the specified duration in hours subtracted.
    The number of hours is multiplied by 3600 to obtain the number of seconds to subtract.
    
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    hoursToSubtract - the hours to subtract, positive or negative
    
    Returns:
    
    a Duration based on this duration with the specified hours subtracted, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - minusMinutes
```
public Duration minusMinutes(long minutesToSubtract)
```
    Returns a copy of this duration with the specified duration in minutes subtracted.
    The number of hours is multiplied by 60 to obtain the number of seconds to subtract.
    
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    minutesToSubtract - the minutes to subtract, positive or negative
    
    Returns:
    
    a Duration based on this duration with the specified minutes subtracted, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - minusSeconds
```
public Duration minusSeconds(long secondsToSubtract)
```
    Returns a copy of this duration with the specified duration in seconds subtracted.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    secondsToSubtract - the seconds to subtract, positive or negative
    
    Returns:
    
    a Duration based on this duration with the specified seconds subtracted, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - minusMillis
```
public Duration minusMillis(long millisToSubtract)
```
    Returns a copy of this duration with the specified duration in milliseconds subtracted.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    millisToSubtract - the milliseconds to subtract, positive or negative
    
    Returns:
    
    a Duration based on this duration with the specified milliseconds subtracted, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - minusNanos
```
public Duration minusNanos(long nanosToSubtract)
```
    Returns a copy of this duration with the specified duration in nanoseconds subtracted.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    nanosToSubtract - the nanoseconds to subtract, positive or negative
    
    Returns:
    
    a Duration based on this duration with the specified nanoseconds subtracted, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - multipliedBy
```
public Duration multipliedBy(long multiplicand)
```
    Returns a copy of this duration multiplied by the scalar.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    multiplicand - the value to multiply the duration by, positive or negative
    
    Returns:
    
    a Duration based on this duration multiplied by the specified scalar, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - dividedBy
```
public Duration dividedBy(long divisor)
```
    Returns a copy of this duration divided by the specified value.
    This instance is immutable and unaffected by this method call.
    
    Parameters:
    
    divisor - the value to divide the duration by, positive or negative, not zero
    
    Returns:
    
    a Duration based on this duration divided by the specified divisor, not null
    
    Throws:
    
    ArithmeticException - if the divisor is zero or if numeric overflow occurs
  - negated
```
public Duration negated()
```
    Returns a copy of this duration with the length negated.
    This method swaps the sign of the total length of this duration. For example, PT1.3S will be returned as PT-1.3S.
    
    This instance is immutable and unaffected by this method call.
    
    Returns:
    
    a Duration based on this duration with the amount negated, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - abs
```
public Duration abs()
```
    Returns a copy of this duration with a positive length.
    This method returns a positive duration by effectively removing the sign from any negative total length. For example, PT-1.3S will be returned as PT1.3S.
    
    This instance is immutable and unaffected by this method call.
    
    Returns:
    
    a Duration based on this duration with an absolute length, not null
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - addTo
```
public Temporal addTo(Temporal temporal)
```
    Adds this duration to the specified temporal object.
    This returns a temporal object of the same observable type as the input with this duration 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 = thisDuration.addTo(dateTime);
   dateTime = dateTime.plus(thisDuration);
 
```
    The calculation will add the seconds, then nanos. Only non-zero amounts will be added.
    
    This instance is immutable and unaffected by this method call.
    Specified by:
    
    addTo in interface TemporalAmount
    
    Parameters:
    
    temporal - the temporal object to adjust, not null
    
    Returns:
    
    an object of the same type with the adjustment made, not null
    
    Throws:
    
    DateTimeException - if unable to add
    
    ArithmeticException - if numeric overflow occurs
  - subtractFrom
```
public Temporal subtractFrom(Temporal temporal)
```
    Subtracts this duration from the specified temporal object.
    This returns a temporal object of the same observable type as the input with this duration 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 = thisDuration.subtractFrom(dateTime);
   dateTime = dateTime.minus(thisDuration);
 
```
    The calculation will subtract the seconds, then nanos. Only non-zero amounts will be added.
    
    This instance is immutable and unaffected by this method call.
    Specified by:
    
    subtractFrom in interface TemporalAmount
    
    Parameters:
    
    temporal - the temporal object to adjust, not null
    
    Returns:
    
    an object of the same type with the adjustment made, not null
    
    Throws:
    
    DateTimeException - if unable to subtract
    
    ArithmeticException - if numeric overflow occurs
  - toDays
```
public long toDays()
```
    Gets the number of days in this duration.
    This returns the total number of days in the duration by dividing the number of seconds by 86400. This is based on the standard definition of a day as 24 hours.
    
    This instance is immutable and unaffected by this method call.
    
    Returns:
    
    the number of days in the duration, may be negative
  - toHours
```
public long toHours()
```
    Gets the number of hours in this duration.
    This returns the total number of hours in the duration by dividing the number of seconds by 3600.
    
    This instance is immutable and unaffected by this method call.
    
    Returns:
    
    the number of hours in the duration, may be negative
  - toMinutes
```
public long toMinutes()
```
    Gets the number of minutes in this duration.
    This returns the total number of minutes in the duration by dividing the number of seconds by 60.
    
    This instance is immutable and unaffected by this method call.
    
    Returns:
    
    the number of minutes in the duration, may be negative
  - toMillis
```
public long toMillis()
```
    Converts this duration to the total length in milliseconds.
    If this duration is too large to fit in a long milliseconds, then an exception is thrown.
    
    If this duration has greater than millisecond precision, then the conversion will drop any excess precision information as though the amount in nanoseconds was subject to integer division by one million.
    
    Returns:
    
    the total length of the duration in milliseconds
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - toNanos
```
public long toNanos()
```
    Converts this duration to the total length in nanoseconds expressed as a long.
    If this duration is too large to fit in a long nanoseconds, then an exception is thrown.
    
    Returns:
    
    the total length of the duration in nanoseconds
    
    Throws:
    
    ArithmeticException - if numeric overflow occurs
  - compareTo
```
public int compareTo(Duration otherDuration)
```
    Compares this duration to the specified Duration.
    The comparison is based on the total length of the durations. It is "consistent with equals", as defined by Comparable.
    
    Specified by:
    
    compareTo in interface Comparable<Duration>
    
    Parameters:
    
    otherDuration - the other duration to compare to, not null
    
    Returns:
    
    the comparator value, negative if less, positive if greater
  - equals
```
public boolean equals(Object otherDuration)
```
    Checks if this duration is equal to the specified Duration.
    The comparison is based on the total length of the durations.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    otherDuration - the other duration, null returns false
    
    Returns:
    
    true if the other duration is equal to this one
    
    See Also:
    
    Object.hashCode(), HashMap
  - hashCode
```
public int hashCode()
```
    A hash code for this duration.
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    a suitable hash code
    
    See Also:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
  - toString
```
public String toString()
```
    A string representation of this duration using ISO-8601 seconds based representation, such as PT8H6M12.345S.
    The format of the returned string will be PTnHnMnS, where n is the relevant hours, minutes or seconds part of the duration. Any fractional seconds are placed after a decimal point i the seconds section. If a section has a zero value, it is omitted. The hours, minutes and seconds will all have the same sign.
    
    Examples:
```
    "20.345 seconds"                 -- "PT20.345S
    "15 minutes" (15 * 60 seconds)   -- "PT15M"
    "10 hours" (10 * 3600 seconds)   -- "PT10H"
    "2 days" (2 * 86400 seconds)     -- "PT48H"
 
```
    Note that multiples of 24 hours are not output as days to avoid confusion with Period.
    Overrides:
    
    toString in class Object
    
    Returns:
    
    an ISO-8601 representation of this duration, not null

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Java compact1, compact2, compact3 java.time Class Duration（JDK8）

Class Duration

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

ZERO

Method Detail

ofDays

ofHours

ofMinutes

ofSeconds

ofSeconds

ofMillis

ofNanos

of

from

parse

between

get

getUnits

isZero

isNegative

getSeconds

getNano

withSeconds

withNanos

plus

plus

plusDays

plusHours

plusMinutes

plusSeconds

plusMillis

plusNanos

minus

minus

minusDays

minusHours

minusMinutes

minusSeconds

minusMillis

minusNanos

multipliedBy

dividedBy

negated

abs

addTo

subtractFrom

toDays

toHours

toMinutes

toMillis

toNanos

compareTo

equals

hashCode

toString