JBEE is as straightforward to use as possible. In the simplest case all you need to do is to create a new instance of
Evaluator and call it's
evaluate() method with the desired expression:
System.out.println(new Evaluator().evaluate("1 + 1");
You will either get a result or
null if the expression cannot be parsed. If you are interested in why parsing fails, use the
evaluateOrThrow() method instead.