Package ucar.units

Provides support for parsing and formatting string unit specification, converting numerical values between compatible units, and performing arithmetic on units (such as dividing one unit by another).

See: Description

Interface Summary

Interface	Description
Base	Interface for "base" entities like base units or base quantities.
Converter	Interface for converting numeric values from one unit to another.
DerivableUnit	Interface for units that can convert numeric values to and from an underlying derived unit.
DerivedUnit	Interface for derived units.
PrefixDB	Interface for a database of unit prefixes.
Unit	Interface for units.
UnitDB	Interface for a unit database.
UnitFormat	Interface for classes that parse and format unit specifications.
UnitSystem	Interface for a system of units.

Class Summary

Class	Description
BaseQuantity	Provides support for abstract base quantities (ex: length, time).
BaseUnit	Provides support for base units.
ConverterImpl	Provides support for implementations of unit converters.
DerivedUnitImpl	Provides support for a concrete implementation of derived units.
Dimension	Provides support for the concept of "dimension": pairs of base entities and exponents.
Factor	Provides support for a Base/exponent pair.
LogarithmicUnit	Provides support for units that are based on a logarithm of the ratio of a physical quantity to an underlying reference level.
OffsetUnit	Provides support for units that are offset from reference units (ex: as the unit "degree Celsius" is offset from the reference unit "kelvin").
Prefix	Provides support for unit prefixes (e.g.
PrefixDBImpl	Provides a concrete implementation of a database of unit prefixes.
PrefixDBManager	Provides support for managing a database of unit prefixes.
PrefixName	Provides support for prefix names and numeric values.
PrefixSymbol	Provides support for prefix symbols.
QuantityDimension	Provides support for the dimension of a quantity.
RegularBaseQuantity	Provides support for a base quantity that is dimensionfull.
ScaledUnit	Provides support for a unit that is a mutiplicative factor of a reference unit.
SI	Provides support for the International System of Units (SI).
StandardPrefixDB	Provides support for a database of standard unit prefixes.
StandardUnitDB	Provides support for a database of standard units.
SupplementaryBaseQuantity	Provides support for supplementary base quantities.
TimeScaleUnit	Provides support for a reference time unit whose origin is at a certain time.
TimeScaleUnit.MyConverter	Provides support for Converter-s.
UnitDBImpl	Provides most of a concrete implementation of a database of units.
UnitDBManager	Provides support for managing a default unit database.
UnitDimension
UnitFormatImpl	Provides support for classes that parse and format unit specifications.
UnitFormatManager	Provides support for managing a default UnitFormat.
UnitID	Provides support for unit identifiers.
UnitImpl	Provides support for classes that implement units.
UnitImpl.MyConverter	Provides support for converting numeric values from this unit to another unit.
UnitName	Provides support for unit names.
UnitSymbol	Provides support for symbols for units.
UnitSystemImpl
UnitSystemManager	Provides support for managing a UnitSystem.
UnknownBaseQuantity	Provides support for an unknown base quantity.
UnknownUnit	Provides support for unknown base units.

Exception Summary

Exception	Description
BadUnitException	Provides support for failures due to attempts to redefine an existing unit in a unit database.
BaseQuantityException	Provides support for base quantity exceptions.
ConversionException	Provides support for unit conversion exceptions.
DivideException	Provides support for unit division failures.
MultiplyException	Provides support for unit multiplication failures.
NameException	Provides support for bad unit names.
NoSuchUnitException	Provides support for failure to find a unit.
OperationException	Provides support for unit operation failures (ex: multiplication).
PrefixDBAccessException	Provides support for prefix database access failures.
PrefixDBException	Provides support for the general class of prefix database failures.
PrefixExistsException	Provides support for prefix database failures.
QuantityExistsException	Provides support for attempting to redefine a base quantity in a database.
RaiseException	Provides support for failure to raise a unit to a power.
ShiftException	Provides support for failure to raise a unit to a power.
SpecificationException	Provides support for errors in unit string specifications.
UnitClassException	Provides support for a Unit that is an instance of an unknown class.
UnitDBAccessException	Provides support for failure to access unit database (e.g.
UnitDBException	Provides support for general unit database failures.
UnitException	Provides support for general failures of this package.
UnitExistsException	Provides support for failures due to attempts to redefine an existing unit in a unit database.
UnitFormatException	Provides support for general failures with unit format classes.
UnitParseException	Provides support for errors in unit specifications.
UnitSystemException	Provides support for errors with the system of units.

Package ucar.units Description

Provides support for parsing and formatting string unit specification, converting numerical values between compatible units, and performing arithmetic on units (such as dividing one unit by another).

Examples of Intended Use

The following code will print the string "5 knots is 2.57222 m/s":

UnitFormat format = UnitFormatManager.instance();
Unit meter = format.parse("meter");
Unit second = format.parse("second");
Unit meterPerSecondUnit = meter.divideBy(second);
Unit knot = format.parse("knot");
if (meterPerSecondUnit.isCompatible(knot) {
System.out.println("5 knots is " +
knot.convertTo(5, meterPerSecondUnit) +
' ' + format.format(meterPerSecondUnit));
}