String to Executable Code

[THEMAN101]

I have a string variable, that holds a mathematical equation such as 4+5-6/(9+3) now i would like to be able to take this string variable and have the java compiler execute a line of code.

Such as

if i wanted to execute this command to store it in a var, but dont want to have the user pick the equation then i would do:

sum = 4+5-6/(9+3);

and sum woul equal 8.5.

now what if it was like this:

String equation;
equation = textFeild.getText();

sum = // Now what would i put here

Hope this explains it.

If you need more explination just post.
Thanks all.

 

[prosper]

I think you need to parse an equation

http://www.eecg.toronto.edu/~lemieux/courses/aps105/99s/Calc.java

 

[OGHS]

I think you cannot do it as simple as you want, instead you have to use a parser generator as prosper said before, I suggest you to use JavaCC it is somehow easy to learn and use,

I hope this helps,

You can find information about it on

https://javacc.dev.java.net/

Oscar