How to convert String "(50-10)" to number and get output as 40 as a number.

Hi,
I have a string with formula, eg: String formula="(ABC-DEF)";
I replaced the values of ABC and DEF in the above string now I have formula="(50-10)";
How can I calculate the above value and get output (40)as a number like int or double.
Regards
Alex.
Edited by: AlexRaju on Dec 8, 2009 10:11 AM

Values for ABC and DEF are coming from different java collections like HashMap or ArrayList etc. The formulas can be complex which need some string manipulations and atlast I will get a string like "(50-10)" or "(20+(Math.SQRT(25)/Math.Power(2,3)))". Here all the numbers are values for variables like ABC or DEF coming from different hashmaps and arraylists based on different conditions.
Thanks
Alex.
Edited by: AlexRaju on Dec 8, 2009 10:36 AM

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