# Class Duration

java.lang.Object
javafx.util.Duration

All Implemented Interfaces:
  `Serializable, Comparable<Duration>`

public class Duration extends Object implements Comparable<Duration>, Serializable

A class that defines a duration of time. Duration instances are immutable, and are therefore replaced rather than modified, similar to `BigDecimal`. Durations can be created using the constructor, or one of the static construction methods such as `seconds(double)` or `minutes(double)`.

Since:
  JavaFX 2.0
See Also:
  - Serialized Form

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final Duration`
  `INDEFINITE`
  An Infinite Duration.
  `static final Duration`
  `ONE`
  A Duration of 1 millisecond.
  `static final Duration`
  `UNKNOWN`
  A Duration of some unknown amount of time.
  `static final Duration`
  `ZERO`
  A Duration of 0 (no time).

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `Duration(double millis)`
  Creates a new Duration with potentially fractional millisecond resolution.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Duration`
  `add(Duration other)`
  Add this instance and another Duration instance to return a new Duration instance.
  `int`
  `compareTo(Duration d)`
  Compares durations represented by this object and the specified object.
  `Duration`
  `divide(double n)`
  Divide this instance by a number to return a new Duration instance.
  `Duration`
  `divide(Duration other)`
  Deprecated.
  This method produces surprising results by not taking units into account.
  `boolean`
  `equals(Object obj)`
  Indicates whether some other object is "equal to" this one.
  `boolean`
  `greaterThan(Duration other)`
  Returns true if the specified duration is greater than (>) this instance.
  `boolean`
  `greaterThanOrEqualTo(Duration other)`
  Returns true if the specified duration is greater than or equal to (>=) this instance.
  `int`
  `hashCode()`
  Returns a hash code for this `Duration` object.
  `static Duration`
  `hours(double h)`
  Factory method that returns a Duration instance representing the specified number of hours.
  `boolean`
  `isIndefinite()`
  Gets whether this Duration instance is Indefinite.
  `boolean`
  `isUnknown()`
  Gets whether this Duration instance is Unknown.
  `boolean`
  `lessThan(Duration other)`
  Returns true if the specified duration is less than (<) this instance.
  `boolean`
  `lessThanOrEqualTo(Duration other)`
  Returns true if the specified duration is less than or equal to (<=) this instance.
  `static Duration`
  `millis(double ms)`
  Factory method that returns a Duration instance for a specified number of milliseconds.
  `static Duration`
  `minutes(double m)`
  Factory method that returns a Duration instance representing the specified number of minutes.
  `Duration`
  `multiply(double n)`
  Multiply this instance with a number representing millis and return a new Duration.
  `Duration`
  `multiply(Duration other)`
  Deprecated.
  This method produces surprising results by not taking units into account.
  `Duration`
  `negate()`
  Return a new Duration instance which has a negative number of milliseconds from this instance.
  `static Duration`
  `seconds(double s)`
  Factory method that returns a Duration instance representing the specified number of seconds.
  `Duration`
  `subtract(Duration other)`
  Subtract other Duration instance from this instance to return a new Duration instance.
  `double`
  `toHours()`
  Returns the number of hours in this period or Double.POSITIVE_INFINITY if the period is INDEFINITE or NaN if the period is UNKNOWN.
  `double`
  `toMillis()`
  Returns the number of milliseconds in this period or Double.POSITIVE_INFINITY if the period is INDEFINITE or NaN if the period is UNKNOWN.
  `double`
  `toMinutes()`
  Returns the number of minutes in this period or Double.POSITIVE_INFINITY if the period is INDEFINITE or NaN if the period is UNKNOWN.
  `double`
  `toSeconds()`
  Returns the number of seconds in this period or Double.POSITIVE_INFINITY if the period is INDEFINITE or NaN if the period is UNKNOWN.
  `String`
  `toString()`
  Returns a string representation of this `Duration` object.
  `static Duration`
  `valueOf(String time)`
  Factory method that returns a Duration instance for a specified amount of time.

  ### Methods declared in class Object

  `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- ## Field Details

  - ### ZERO

    public static final Duration ZERO
    A Duration of 0 (no time).

  - ### ONE

    public static final Duration ONE
    A Duration of 1 millisecond.

  - ### INDEFINITE

    public static final Duration INDEFINITE
    An Infinite Duration.

  - ### UNKNOWN

    public static final Duration UNKNOWN
    A Duration of some unknown amount of time.

- ## Constructor Details

  - ### Duration

    public Duration(double millis)
    Creates a new Duration with potentially fractional millisecond resolution.
    Parameters:
      `millis` - The number of milliseconds

- ## Method Details

  - ### valueOf

    public static Duration valueOf(String time)
    Factory method that returns a Duration instance for a specified amount of time. The syntax is "[number][ms|s|m|h]".
    Parameters:
      `time` - A non-null string properly formatted. Leading or trailing spaces will not parse correctly. Throws a NullPointerException if time is null.
    Returns:
      a Duration which is represented by the `time`

  - ### millis

    public static Duration millis(double ms)
    Factory method that returns a Duration instance for a specified number of milliseconds.
    Parameters:
      `ms` - the number of milliseconds
    Returns:
      a Duration instance of the specified number of milliseconds

  - ### seconds

    public static Duration seconds(double s)
    Factory method that returns a Duration instance representing the specified number of seconds.
    Parameters:
      `s` - the number of seconds
    Returns:
      a Duration instance of the specified number of seconds

  - ### minutes

    public static Duration minutes(double m)
    Factory method that returns a Duration instance representing the specified number of minutes.
    Parameters:
      `m` - the number of minutes
    Returns:
      a Duration instance of the specified number of minutes

  - ### hours

    public static Duration hours(double h)
    Factory method that returns a Duration instance representing the specified number of hours.
    Parameters:
      `h` - the number of hours
    Returns:
      a Duration instance representing the specified number of hours

  - ### toMillis

    public double toMillis()
    Returns the number of milliseconds in this period or Double.POSITIVE_INFINITY if the period is INDEFINITE or NaN if the period is UNKNOWN.
    Returns:
      the Duration in fractional milliseconds

  - ### toSeconds

    public double toSeconds()
    Returns the number of seconds in this period or Double.POSITIVE_INFINITY if the period is INDEFINITE or NaN if the period is UNKNOWN.
    Returns:
      the Duration in fractional seconds

  - ### toMinutes

    public double toMinutes()
    Returns the number of minutes in this period or Double.POSITIVE_INFINITY if the period is INDEFINITE or NaN if the period is UNKNOWN.
    Returns:
      the Duration in fractional minutes

  - ### toHours

    public double toHours()
    Returns the number of hours in this period or Double.POSITIVE_INFINITY if the period is INDEFINITE or NaN if the period is UNKNOWN.
    Returns:
      the Duration in fractional hours

  - ### add

    public Duration add(Duration other)
    Add this instance and another Duration instance to return a new Duration instance. If either instance is INDEFINITE, return INDEFINITE. If either instance is UNKNOWN, return UNKNOWN. This method does not change the value of the called Duration instance.
    Parameters:
      `other` - must not be null
    Returns:
      the result of adding this duration to the other duration. This is the same as millis + other.millis using double arithmetic

  - ### subtract

    public Duration subtract(Duration other)
    Subtract other Duration instance from this instance to return a new Duration instance. If either instance is UNKNOWN, return UNKNOWN. Otherwise, if either instance is INDEFINITE, return INDEFINITE. This method does not change the value of the called Duration instance.
    Parameters:
      `other` - must not be null
    Returns:
      the result of subtracting the other duration from this duration. This is the same as millis - other.millis using double arithmetic

  - ### multiply

    @Deprecated public Duration multiply(Duration other)
    Deprecated.
    This method produces surprising results by not taking units into account. Use `multiply(double)` instead.
    Multiply this instance with a number to return a new Duration instance. If either instance is INDEFINITE, return INDEFINITE. If either Duration instance is UNKNOWN, return UNKNOWN. This method does not change the value of the called Duration instance.
    Parameters:
      `other` - must not be null
    Returns:
      the result of multiplying this duration with the other duration. This is the same as millis * other.millis using double arithmetic

  - ### multiply

    public Duration multiply(double n)
    Multiply this instance with a number representing millis and return a new Duration. If the called Duration instance is INDEFINITE, return INDEFINITE. If the called Duration instance is UNKNOWN, return UNKNOWN. This method does not change the value of the called Duration instance.
    Parameters:
      `n` - the amount to multiply by in fractional milliseconds
    Returns:
      the result of multiplying this duration with n. This is the same as millis * n using double arithmetic

  - ### divide

    public Duration divide(double n)
    Divide this instance by a number to return a new Duration instance. If the called Duration instance is INDEFINITE, return INDEFINITE. If the called Duration instance is UNKNOWN, return UNKNOWN. This method does not change the value of the called Duration instance.
    Parameters:
      `n` - the amount to divide by in fractional milliseconds
    Returns:
      the result of dividing this duration with n. This is the same as millis / n using double arithmetic

  - ### divide

    @Deprecated public Duration divide(Duration other)
    Deprecated.
    This method produces surprising results by not taking units into account. Use `divide(double)` instead.
    Divide this instance by another Duration to return the ratio. If both instances are INDEFINITE, return NaN. If this instance is INDEFINITE, return POSITIVE_INFINITY If the other instance is INDEFINITE, return 0.0. This function does not change the value of the called Duration instance.
    Parameters:
      `other` - must not be null
    Returns:
      the result of dividing this duration by the other duration. This is the same as millis / other.millis using double arithmetic

  - ### negate

    public Duration negate()
    Return a new Duration instance which has a negative number of milliseconds from this instance. For example, `Duration.millis(50).negate()` returns a Duration of -50 milliseconds. If the called Duration instance is INDEFINITE, return INDEFINITE. This function does not change the value of the called Duration instance.
    Returns:
      the result of negating this duration. This is the same as -millis using double arithmetic

  - ### isIndefinite

    public boolean isIndefinite()
    Gets whether this Duration instance is Indefinite. A Duration is Indefinite if it equals Duration.INDEFINITE.
    Returns:
      true if this Duration is equivalent to Duration.INDEFINITE or Double.POSITIVE_INFINITY.

  - ### isUnknown

    public boolean isUnknown()
    Gets whether this Duration instance is Unknown. A Duration is Unknown if it equals Duration.UNKNOWN.
    Returns:
      true if this Duration is equivalent to Duration.UNKNOWN or Double.isNaN(millis)

  - ### lessThan

    public boolean lessThan(Duration other)
    Returns true if the specified duration is less than (<) this instance. INDEFINITE is treated as if it were positive infinity.
    Parameters:
      `other` - cannot be null
    Returns:
      true if millis < other.millis using double arithmetic

  - ### lessThanOrEqualTo

    public boolean lessThanOrEqualTo(Duration other)
    Returns true if the specified duration is less than or equal to (<=) this instance. INDEFINITE is treated as if it were positive infinity.
    Parameters:
      `other` - cannot be null
    Returns:
      true if millis <= other.millis using double arithmetic

  - ### greaterThan

    public boolean greaterThan(Duration other)
    Returns true if the specified duration is greater than (>) this instance. INDEFINITE is treated as if it were positive infinity.
    Parameters:
      `other` - cannot be null
    Returns:
      true if millis > other.millis using double arithmetic

  - ### greaterThanOrEqualTo

    public boolean greaterThanOrEqualTo(Duration other)
    Returns true if the specified duration is greater than or equal to (>=) this instance. INDEFINITE is treated as if it were positive infinity.
    Parameters:
      `other` - cannot be null
    Returns:
      true if millis >= other.millis using double arithmetic

  - ### toString

    public String toString()
    Returns a string representation of this `Duration` object.
    Overrides:
      `toString` in class `Object`
    Returns:
      a string representation of this `Duration` object.

  - ### compareTo

    public int compareTo(Duration d)
    Compares durations represented by this object and the specified object. Returns a negative integer, zero, or a positive integer as this duration is less than, equal to, or greater than the specified duration.
    Specified by:
      `compareTo` in interface `Comparable<Duration>`
    Parameters:
      `d` - the duration to be compared.
    Returns:
      a negative integer, zero, or a positive integer as this duration is less than, equal to, or greater than the specified duration.

  - ### equals

    public boolean equals(Object obj)
    Indicates whether some other object is "equal to" this one.
    Overrides:
      `equals` in class `Object`
    Parameters:
      `obj` - the reference object with which to compare.
    Returns:
      `true` if this object is equal to the `obj` argument; `false` otherwise.

  - ### hashCode

    public int hashCode()
    Returns a hash code for this `Duration` object.
    Overrides:
      `hashCode` in class `Object`
    Returns:
      a hash code for this `Duration` object.