Have a look at JSR 275 with examples at 
http://www.javaworld.com/javaworld/jw-10-2007/jw-10-jsr275.html

This looks like adding unit conversion and formatting to the main Java 
libraries.

Paul

Sunburned Surveyor wrote:
> I thought about possible solutions to support for formatting units in
> OpenJUMP and I am working on some code to implement on one of these
> solutions. The solution I am currently working on builds on the
> concepts already embodied in OpenJUMP's existing code and ties in the
> Java I18N system.
>
> Basically the code in the system will serve a single purpose:
> Providing client code with a String that has been properly formatted
> for display to the user based on a unit system for a particular
> Locale. (Each Locale can have more than one unit system associated
> with it. For example: The en_US locale might have a metric and
> imperial distance unit systems.)
>
> I will release the code when I have completed the Javadoc and unit
> testing of the two (2) main interfaces, MeasurmentFormatInfo and
> UnitSystem. I will release the following unit systems for the en_US
> locale as an examples:
>
> Survey Foot and Mile Distance Unit System
> Inches, Foot, and Mile Distance Unit System
> Metic Distance Unit System
> Metric Area Unit System
> Square Feet and Acres Area Unit System
> Decimal Degrees Angle and Direction Unit System
>
> I will then begin to incoporate this Unit System into OpenJUMP if I
> get everyone's approval. I know we still need to talk about how this
> will be incoporated into the program.
>
> The Sunburned Surveyor
>
> P.S. - My solution does not directly support conversions between unit
> systems. It is instead focused on formatting measurement values from
> different user systems.
>
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