User Created Equations and program Variables

Is there a way that I can take a user entered equation and apply it as the equation for a value? How can I make a String entered by the user to act as an equation insted of a string?
I've created a part in my program with various mathematic operators as well as user friendly variables. The user selects the operators as well as variables from JComboBoxes. The user-friendly variables are converted to actual variables via a hash and another string is created to represent an equation.
Example:
User selects variables and operators to create:
String UserEquation="(Average Tip)-(Total Fares *.10)";
The above isn't much helpful if it doesn't reference real varaibles. The real equation after applying the hash is:
String RealEquation = "(numbers.get(1) - (numbers.get(3)*.1)";
Note: numbers is a vector of doubles.
How can I get the program to evaluate the "Real Equation" instead of treating it like String?
I would like to do somthing like the following:
double total=RealEquation;
Make Sense?? Is there a way to accomplish this? anyone have any idea how I could do this? Thanks in advance!!!

Or, if speed isnt an issue, search the forum for using J6's scripting support
to use JavaScript for equation evaluation. I posted an example just a couple weeks ago.
Here it is:
http://forum.java.sun.com/thread.jspa?threadID=5228772&messageID=9933551
Reply #8

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