How to write units in Java like Radian, Newton, Pascal, mm, kg?

Question

I am developing a Java application, its about converting Mathcad worksheet to Java application. Can anyone know/suggest how to write units(newton, pascal, mm, kg)in java code?

Example:1?

double var1 = 10*newton/mm;//looking for a way to write the code in this format.
double var2 = 5*mmpower2;
double var = var1/var2;
double var = ?

Example: 2?

double var1 = 90degress-tan(60)*Radian;
double var1 = ?

is this supposed to be java code? there is no var in java. for your problem you should create classes for each unit — henje, Jan 20 '14 at 16:28
Take a look at the [`java.util.concurrent.TimeUnit`](http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/TimeUnit.html) class. It represents various time units, from nanoseconds to days, in a convenient manner. Maybe you could take inspiration from this class when writing your own unit-related classes ? — Olivier Croisier, Jan 20 '14 at 16:34

score 3 · Accepted Answer · answered Jan 20 '14 at 16:42

3

You could use the Javax.units package, especially the Java Unit Class.

This is a well-studied problem and for any non-trivial program you should always use an existing units library.

answered Jan 20 '14 at 16:42

Mike Vella

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score 0 · Answer 2 · answered Jan 20 '14 at 16:43

0

Neither of your examples are sensible Java.

You want to implement the Martin Fowler Analysis Patterns idea of Quantity with units.

There are libraries that exist, like JScience, but I don't know if they're in widespread use.

answered Jan 20 '14 at 16:43

duffymo

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Bascially, I was looking for a way to write the code in that format. JScience and Unit seems to be the answer for this. – Vijay Vennapusa Jan 20 '14 at 16:51

How to write units in Java like Radian, Newton, Pascal, mm, kg?

2 Answers2