Re: Parsing a string expresion

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#8615

From: Torsten Welches
Date: Mon, 12 Mar 2001 06:31

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"Francisco Correa" <constru01@interpla.net.co> wrote:
>I want to know how can I parse a string expresion as "=2+3" to 
>a Double value using Java 1.3

that depends on how complicated the string expression can get.
If the second and fourth characters are always 1-digit numbers 
and the third is always an arithmetic operator it would be quite
easy with String.charAt, Integer.valueOf and so on. 
If the structure can get more complicated (e.g. more then one 
arithmetic operator) you need to tokenize before you parse.
java.text.BreakIterator or java.io.StreamTokenizer look like they
could be helpful for this.

Torsten

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