How can I evaluate a mathematical function in Java?

Question

Possible Duplicates:
Open Source Expression Engines (Java)
Convert mathematical string to int

Hello,

If I have a string that says anything along the lines of "x+6", how can I turn that into a function that can be evaluated with me substituting a variable in for x.

For example, say I want to run it into a foreach loop:

String func = "x+6";
for(int i : ints)
    y = func(i);

before you say "just make it a method," know that the string can change according to the program. that is to say, at any point the string could be "x^2-2", "x/2*3", "4^x", etc...

I want a way to turn a string into a function that i can evaluate. thanks!

Answer 1

There isn't, so far as I am aware, a standard mechanism for this. But google came up with a bunch of projects that seem to do this.