Packages
Package	Description
org.expressionj	Contains only a command line class which gives the version and date of this library.
org.expressionj.expr	Contain classes that are used to compute equations.
org.expressionj.expr.parser	Produced by javaCC.
org.expressionj.functions	Contains classes which allows to bind names in the mathematical expressions to regular Java methods.
org.expressionj.model	Contains fundamental classes used for expressions.
org.expressionj.util	Contains several utility classes.

ExpressionJ is a Java library allowing to interpret simple numeric expressions, which may be used in all applications which have to combine numeric values, but do not want to use full-blown scripting languages.

Example

Let's take for example the following numeric expression: a+2
To parse this expression, we will type:

      Equation equation = ExpressionJ.parse("a+2");

Let's evaluate the expression with 1 for the value of a:

      equation.getVariable("a").setValue(1);
      Object result = equation.eval();

The result will be the Integer 3.

ExpressionJ API

Example