Package org.djunits.quantity

Class Energy

java.lang.Object

java.lang.Number

org.djunits.quantity.def.Quantity<Energy,Energy.Unit>

org.djunits.quantity.Energy

All Implemented Interfaces:

Serializable, Comparable<Energy>, Additive<Energy>, Scalable<Energy>, Value<Energy.Unit,Energy>

public class Energy
extends Quantity<Energy,Energy.Unit>

Energy is a physical quantity representing the capacity to do work, measured in joules (J).

Copyright (c) 2025-2026 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See for project information https://djunits.org. The DJUNITS project is distributed under a three-clause BSD-style license.

Author:

Alexander Verbraeck

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Energy.Unit	Energy.Unit encodes the units of energy.

Field Summary

Fields

Modifier and Type	Field	Description
static final Energy	NaN	Constant with value NaN.
static final Energy	NEG_MAXVALUE	Constant with value -MAX_VALUE.
static final Energy	NEGATIVE_INFINITY	Constant with value NEGATIVE_INFINITY.
static final Energy	ONE	Constant with value one.
static final Energy	POS_MAXVALUE	Constant with value MAX_VALUE.
static final Energy	POSITIVE_INFINITY	Constant with value POSITIVE_INFINITY.
static final Energy	ZERO	Constant with value zero.

Constructor Summary

Constructors

Constructor	Description
Energy(double value, String abbreviation)	Instantiate a Energy quantity with a unit, expressed as a String.
Energy(double value, Energy.Unit unit)	Instantiate a Energy quantity with a unit.
Energy(Energy value)	Construct Energy quantity.

Method Summary

Modifier and Type	Method	Description
final Power	divide(Duration v)	Calculate the division of Energy and Duration, which results in a Power scalar.
final Dimensionless	divide(Energy v)	Calculate the division of Energy and Energy, which results in a Dimensionless quantity.
final Length	divide(Force v)	Calculate the division of Energy and Force, which results in a Length scalar.
final Force	divide(Length v)	Calculate the division of Energy and Length, which results in a Force scalar.
final Speed	divide(Momentum v)	Calculate the division of Energy and Momentum, which results in a Speed scalar.
final Duration	divide(Power v)	Calculate the division of Energy and Power, which results in a Duration scalar.
final Volume	divide(Pressure v)	Calculate the division of Energy and Pressure, which results in a Volume scalar.
final Momentum	divide(Speed v)	Calculate the division of Energy and Speed, which results in a Momentum scalar.
final Pressure	divide(Volume v)	Calculate the division of Energy and Volume, which results in a Pressure scalar.
Energy	instantiate(double si)	Instantiate a quantity with an SI or base value.
final Power	multiply(Frequency v)	Calculate the multiplication of Energy and Frequency, which results in a Power scalar.
final Force	multiply(LinearObjectDensity v)	Calculate the multiplication of Energy and LinearDensity, which results in a Force scalar.
static Energy	of(double value, String unitString)	Returns a Energy based on a value and the textual representation of the unit, which can be localized.
static Energy	ofSi(double si)	Return a Energy instance based on an SI value.
SIUnit	siUnit()	Return the SI unit of this quantity.
static Energy	valueOf(String text)	Returns a Energy representation of a textual representation of a value with a unit.

Methods inherited from class org.djunits.quantity.def.Quantity

abs, add, as, compareTo, divide, doubleValue, eq, eq0, equals, floatValue, format, format, ge, ge0, getDisplayUnit, getInUnit, getInUnit, getName, gt, gt0, hashCode, instantiate, interpolate, intValue, isRelative, le, le0, longValue, lt, lt0, max, mean, min, multiply, ne, ne0, negate, of, product, reciprocal, scaleBy, setDisplayUnit, si, subtract, sum, toDisplayString, toDisplayString, toString, toString, toString, toString, toStringSIPrefixed, toStringSIPrefixed, toTextualString, toTextualString, valueOf

Methods inherited from class java.lang.Number

byteValue, shortValue

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.djunits.value.Scalable

divideBy

Methods inherited from interface org.djunits.value.Value

isAbsolute, setDisplayUnit

Field Details

ZERO

public static final Energy ZERO

Constant with value zero.

ONE

public static final Energy ONE

Constant with value one.

NaN

public static final Energy NaN

Constant with value NaN.

POSITIVE_INFINITY

public static final Energy POSITIVE_INFINITY

Constant with value POSITIVE_INFINITY.

NEGATIVE_INFINITY

public static final Energy NEGATIVE_INFINITY

Constant with value NEGATIVE_INFINITY.

POS_MAXVALUE

public static final Energy POS_MAXVALUE

Constant with value MAX_VALUE.

NEG_MAXVALUE

public static final Energy NEG_MAXVALUE

Constant with value -MAX_VALUE.

Constructor Details

Energy

public Energy(double value,
 Energy.Unit unit)

Instantiate a Energy quantity with a unit.

Parameters:

value - the value, expressed in the unit

unit - the unit in which the value is expressed

Energy

public Energy(double value,
 String abbreviation)

Instantiate a Energy quantity with a unit, expressed as a String.

Parameters:

value - the value, expressed in the unit

abbreviation - the String abbreviation of the unit in which the value is expressed

Energy

public Energy(Energy value)

Construct Energy quantity.

Parameters:

value - Scalar from which to construct this instance

Method Details

ofSi

public static Energy ofSi(double si)

Return a Energy instance based on an SI value.

Parameters:

si - the si value

Returns:

the Energy instance based on an SI value

instantiate

public Energy instantiate(double si)

Description copied from class: Quantity

Instantiate a quantity with an SI or base value.

Specified by:

instantiate in class Quantity<Energy,Energy.Unit>

Parameters:

si - the value expressed in the base (SI) unit

Returns:

a quantity with the given SI-value and base (SI) unit

siUnit

public SIUnit siUnit()

Description copied from class: Quantity

Return the SI unit of this quantity.

Overrides:

siUnit in class Quantity<Energy,Energy.Unit>

Returns:

the SI unit of this quantity

valueOf

public static Energy valueOf(String text)

Returns a Energy representation of a textual representation of a value with a unit. The String representation that can be parsed is the double value in the unit, followed by a localized or English abbreviation of the unit. Spaces are allowed, but not required, between the value and the unit.

Parameters:

text - the textual representation to parse into a Energy

Returns:

the Scalar representation of the value in its unit

Throws:

IllegalArgumentException - when the text cannot be parsed

NullPointerException - when the text argument is null

of

public static Energy of(double value,
 String unitString)

Returns a Energy based on a value and the textual representation of the unit, which can be localized.

Parameters:

value - the value to use

unitString - the textual representation of the unit

Returns:

the Scalar representation of the value in its unit

Throws:

IllegalArgumentException - when the unit cannot be parsed or is incorrect

NullPointerException - when the unitString argument is null

divide

public final Dimensionless divide(Energy v)

Calculate the division of Energy and Energy, which results in a Dimensionless quantity.

Parameters:

v - quantity

Returns:

quantity as a division of Energy and Energy

divide

public final Length divide(Force v)

Calculate the division of Energy and Force, which results in a Length scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Energy and Force

divide

public final Force divide(Length v)

Calculate the division of Energy and Length, which results in a Force scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Energy and Length

multiply

public final Force multiply(LinearObjectDensity v)

Calculate the multiplication of Energy and LinearDensity, which results in a Force scalar.

Parameters:

v - scalar

Returns:

scalar as a multiplication of Energy and LinearDensity

divide

public final Power divide(Duration v)

Calculate the division of Energy and Duration, which results in a Power scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Energy and Duration

divide

public final Duration divide(Power v)

Calculate the division of Energy and Power, which results in a Duration scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Energy and Power

divide

public final Pressure divide(Volume v)

Calculate the division of Energy and Volume, which results in a Pressure scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Energy and Volume

divide

public final Volume divide(Pressure v)

Calculate the division of Energy and Pressure, which results in a Volume scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Energy and Pressure

multiply

public final Power multiply(Frequency v)

Calculate the multiplication of Energy and Frequency, which results in a Power scalar.

Parameters:

v - scalar

Returns:

scalar as a multiplication of Energy and Frequency

divide

public final Momentum divide(Speed v)

Calculate the division of Energy and Speed, which results in a Momentum scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Energy and Speed

divide

public final Speed divide(Momentum v)

Calculate the division of Energy and Momentum, which results in a Speed scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Energy and Momentum