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 there 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

The Apache-commons-lang project (http://commons.apache.org/lang/) contains classes dealing with ranges (like IntRange - https://commons.apache.org/proper/commons-lang/javadocs/api-2.6/org/apache/commons/lang/math/IntRange.html). I'm not sure it covers all your needs, but it might be worth checking.