How to model an amount of Money in Java

Question

Can anybody recommend a class library or a design pattern that models amounts of Money?

I guess it should support:

• multiple currencies
• a mechanism to indicate the number of decimals
• math (respecting certain rounding conventions (cfr ie. Banker's Rounding))
• serialisation to and from a String representation
• ... ?

I.e. 19.99 USD could be serialized into "USD-2-00000001999"
(Whereas 2 indicates the number of decimals)

Answer 1

I would check the monetary module from the JScience project (by Jean Marie Dautelle).

Depending on your exact needs, Stephen Colebourne started Joda-Money ("a more focussed project" [than JScience]) some time ago. But there is no full release available yet (version 0.5 was released one year ago).