Boolean Expression Evaluation in Java

Question

I\'m looking for a relatively simpler (when compared with writing a parser) way to evaluate boolean expressions in Java, and I do not want to use the JEP library.

I

Answer 1

Here is the latest resources for expression evaluation framework

The information page is at http://expressionoasis.vedantatree.com/

Answer 2

There is a API available at http://lts.online.fr/dev/java/math.evaluator/

Example:

MathEvaluator m = new MathEvaluator("-5-6/(-2) + sqr(15+x)");
m.addVariable("x", 15.1d);
System.out.println( m.getValue() );

Answer 3

You could use the scripting engine in Java6 and the choose any of the popular scripting languages like Scala, Ruby, Python, Groovy, and Javascript. Than all you have to do is make sure the expression you want to evaluate is in the right language. Groovy is probably the easiest and will integrate best.

I have used this method successfully for a feature offering capabilities much like a formula / calculated column in a popular spreadsheet application.

Answer 4

Use Apache Commons Jexl; which is exactly designed for such requirement.

http://commons.apache.org/jexl/