Java Metric Unit Conversion Library? [closed]

Question

I have an application that will need to perform a number of unit conversions (metric to Imperial, Imperial to metric).

Is there an existing Java library that does this? Or will I need to roll my own? (My initial Google searches proved moderately useless.)

Answer 1

there is a specific JSR 275 (javax.measure) with JScience as RI (Reference Implementation). For example converting 100 Miles to kilometers is easy as:

UnitConverter toKilometers = MILE.getConverterTo(KILOMETER); double km = toKilometers.convert(Measure.valueOf(100, MILE).doubleValue(MILE)); 

(note that units are all type safe a compile-time, a killer feature imho)

The reverse can be easy:

UnitConverter toMiles1 = KILOMETER.getConverterTo(MILE); 

or supereasy as:

UnitConverter toMiles2 = toKilometers.inverse(); 

NB imports:

import javax.measure.Measure; import javax.measure.converter.UnitConverter; import javax.measure.quantity.Length; import static javax.measure.unit.NonSI.*; import static javax.measure.unit.SI.*;