Does an open-ended interval implementation exist for Java?

Question

I've got a classification of certain values in different intervals. Most have the form [20-30], but some are of the form [30-infinite).

Is the an interval class you know of which can represent:

• an interval which is not closed on both sides (e.g. (0-5) or [0-5) )
• an interval which closes (or starts) on infinite

Answer 1

I know of no library classes, but I recall rather trivially writing such classes.

Answer 2

Time&Money project seems to have Interval class that you need.

See these files in their svn: interval package.

Answer 3

The Apache-commons-lang project (http://commons.apache.org/lang/) contains classes dealing with ranges (like IntRange - http://commons.apache.org/lang/apidocs/org/apache/commons/lang/math/IntRange.html). I'm not sure it covers all your needs, but it might be worth checking.