Units of Measurement API 2.2 · javax.measure.quantity

[OPTIONAL] Provides quantitative properties or attributes of thing such as mass, time, distance, heat, and angular separation. Quantities of different kinds are represented by sub-types of the javax.measure.Quantity interface.

Only quantities defined in the BIPM - SI Brochure are provided here. Users can create their own quantity types by extending the Quantity interface.

This package supports measurable quantities, which can be expressed as (java.lang.Number, javax.measure.Unit) tuples. Those tuples are not necessarily used directly in numerically intensive code. They are more useful as meta-data converted to the application internal representation (for example double primitive type with the requirement to provide values in meters) before computation begins.

Quantity sub-types are also used as parameterized type to characterize generic classes and provide additional compile time check. This technique is used extensively by the javax.measure.Unit interface, but users can apply the same approach to their own classes. In the example below, Sensor, MyQuantity and Vector3D are user-defined classes:


   // A general-purpose Sensor class used for temperature measurements:

   Sensor<Temperature> sensor ...;

   Temperature temp = sensor.getValue();



   // A vector of velocity in a three-dimensional space.

   Unit<Speed> = metrePerSecond = METRE.divide(SECOND);

   Vector3D<Speed> aircraftSpeed = new Vector3D(200.0, 50.0, -0.5, metrePerSecond);

This package holds only the quantities required by the metric system.

Interface Summary

Modifier and Type	Interface and Description
public interface	Acceleration Rate of change of velocity with respect to time.
public interface	AmountOfSubstance Number of elementary entities (molecules, for example) of a substance.
public interface	Angle Figure formed by two lines diverging from a common point.
public interface	Area Extent of a planar region or of the surface of a solid measured in square units.
public interface	CatalyticActivity Catalytic activity.
public interface	Dimensionless Dimensionless quantity.
public interface	ElectricCapacitance Electric capacitance.
public interface	ElectricCharge Electric charge.
public interface	ElectricConductance Electric conductance.
public interface	ElectricCurrent Amount of electric charge flowing past a specified circuit point per unit time.
public interface	ElectricInductance Electric inductance.
public interface	ElectricPotential Electric potential or electromotive force.
public interface	ElectricResistance Electric resistance.
public interface	Energy Capacity of a physical system to do work.
public interface	Force Quantity that tends to produce an acceleration of a body in the direction of its application.
public interface	Frequency Number of times a specified phenomenon occurs within a specified interval.
public interface	Illuminance Illuminance.
public interface	Length Extent of something along its greatest dimension or the extent of space between two objects or places.
public interface	LuminousFlux Luminous flux.
public interface	LuminousIntensity Luminous flux density per solid angle as measured in a given direction relative to the emitting source.
public interface	MagneticFlux Magnetic flux.
public interface	MagneticFluxDensity Magnetic flux density.
public interface	Mass Measure of the quantity of matter that a body or an object contains.
public interface	Power Rate at which work is done.
public interface	Pressure Force applied uniformly over a surface.
public interface	RadiationDoseAbsorbed Amount of energy deposited per unit of mass.
public interface	RadiationDoseEffective Effective (or "equivalent") dose of radiation received by a human or some other living organism.
public interface	Radioactivity Radioactive activity.
public interface	SolidAngle Angle formed by three or more planes intersecting at a common point.
public interface	Speed Distance traveled divided by the time of travel.
public interface	Temperature Degree of hotness or coldness of a body or an environment.
public interface	Time Period of existence or persistence.
public interface	Volume Amount of space occupied by a three-dimensional object or region of space.

Package javax.measure.quantity

Interface Summary