A new version of JEP and the JEP Extensions has been released! This
release patches some bugs in JEP 2.4.0 and Extensions 1.1.0.
http://www.singularsys.com/jep
JEP is a Java library for parsing and evaluating mathematical
expressions. With this package you can allow your users to enter an
arbitrary formula as a string, and instantly evaluate it. JEP supports
user defined variables, constants, and functions. A number of common
mathematical functions and constants are included.