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Thread: Convert String Literal into Operation

  1. #1
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    Default Convert String Literal into Operation

    After searching on several forums for a while IW as unable to find similar posts, so I was hoping I would be able to get some help. I want to convert a string literal into an operation, however I'm not sure how to start. Here's a (bad) attempt I've made so far


    class test
    {
        public static void main (String args[])
        {
            String eq1 = "x/2+6";
            double eq2 = eq1; // <- want "double eq2 = x/2+6;"
            System.out.println (eq2);
        }
    }


  2. #2
    Member Darryl.Burke's Avatar
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    Default Re: Convert String Literal into Operation

    Search the net for the Java scripting API. Also take a look at the classes and interfaces in the javax.script package.

    I've never used this stuff, so I can't advise further.

    db

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    Super Moderator Norm's Avatar
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    Default Re: Convert String Literal into Operation

    double eq2 = eq1;
    Perhaps a better example would be;
     double eq2 = evaluateToDouble(eq1);

    Now you need to find the class with a method like that.

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    Super Moderator helloworld922's Avatar
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    Default Re: Convert String Literal into Operation

    Use python, or some other similar scripting language. The alternative is to write a parser yourself (not simple!). With Jython, you can integrate your Java program with Python.

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    Default Re: Convert String Literal into Operation

    With a bit of Google and help at another forum, I found JEval, which worked great

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