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From "sachin" <sachin.he...@paradyne.co.in>
Subject RE: Help : Thanks Joe : execute a equation in String format
Date Wed, 05 Jan 2005 12:46:28 GMT
hi Joe , 

Jakarta commons JEXL works perfectly with expressions ..
and this saved me from creating an 'expression builder' and saved a lot of 
time ...

Thanks a lot .

cheers ,
Sachin Hegde
Software Developer
Paradyne Infotech Limited , Mumbai
09324546711

"The believer is happy. The doubter is wise." -Benjamin Disraeli

---------- Original Message -----------
From: Joe Germuska <Joe@Germuska.com>
To: "Apurva Goswami" <agoswami@arnoldtraveltechnology.com>, "Struts Users 
Mailing List" <user@struts.apache.org>
Sent: Tue, 4 Jan 2005 16:34:15 -0600
Subject: [OT] RE: Help : execute a equation in String format

> Have a look at commons-jexl:
> http://jakarta.apache.org/commons/jexl/
> 
> import org.apache.commons.jexl.*;
> 
> public class JexlExample {
> 
>      public static void main(String[] args)  throws Exception {
>          String expr = "((123*123+567-7899*340)/1234)*1000";
>          Expression e = ExpressionFactory.createExpression(expr);
>          JexlContext context = JexlHelper.createContext();
>          // here you'd populate your context if you had any variables...
>          Object result = e.evaluate(context);
>          System.out.println("result: " + result);
>      }
> }
> 
> At 9:11 AM +1100 1/5/05, Apurva Goswami wrote:
> >Hi Sachin,
> >
> >Haven't tried but have a look at these links:
> >
> >http://jakarta.apache.org/poi/apidocs/org/apache/poi/hssf/model/FormulaP
> >arser.html
> >
> >
> >http://maplenet.maplesoft.com/doc/com/maplesoft/maplenet/client/MapleSta
> >tement.html
> >
> >
> >Cheers
> >Apurva
> >
> >
> >-----Original Message-----
> >From: sachin [mailto:sachin.hegde@paradyne.co.in]
> >Sent: Tuesday, January 04, 2005 6:14 PM
> >To: Struts Users Mailing List
> >Subject: RE: Help : execute a equation in String format
> >
> >hi apurva ,
> >
> >>  To be precise you can java.math.BigDecimal and then convert your
> >result
> >>  into string object.
> >
> >Thanks for ur reply . The equation builder can be achieved this way.
> >But if the query is complex it takes a long way ... like looking for the
> >
> >innermost brackets, aplying square roots , squares , * , / , + , -  etc
> >..and
> >more .
> >
> >So i was looking for some library class which can take an arithmetic
> >equation
> >and deliver its result .. but if this sort of thing is not available  ..
> >then
> >i will have to develope it.
> >
> >Regards,
> >Sachin Hegde
> >Software Developer
> >Paradyne Infotech Limited , Mumbai
> >09324546711
> >
> >"The believer is happy. The doubter is wise." -Benjamin Disraeli
> >
> >---------- Original Message -----------
> >From: "Apurva Goswami" <agoswami@arnoldtraveltechnology.com>
> >To: "Struts Users Mailing List" <user@struts.apache.org>
> >Sent: Tue, 4 Jan 2005 17:28:43 +1100
> >Subject: RE: Help : execute a equation in String format
> >
> >>  Hi Sachin,
> >>
> >>  You can use java.math class to achieve what you want.
> >>  To be precise you can java.math.BigDecimal and then convert your
> >result
> >>  into string object.
> >>
> >>  Hope this helps.
> >>
> >>  Cheers
> >>  Apurva
> >>
> >>  -----Original Message-----
> >>  From: sachin [mailto:sachin.hegde@paradyne.co.in]
> >>  Sent: Tuesday, January 04, 2005 5:34 PM
> >>  To: Struts Users Mailing List
> >>  Subject: Help : execute a equation in String format
> >>
> >>  hi ,
> >>
> >>  I have equation in String format
> >>  like
> >>
> >  > String equ = "((123*123+567-7899*340)/1234)*1000";
> >>
> >>  now i want to execute this equation and get the result ..
> >>  How can i achieve this in java ?
> >>
> >>  note : This is not a struts -related issue ... yet i need help so i
> >>  posted ..
> >>  hope nobody minds much ....
> >>
> >>  Regards,
> >>  Sachin Hegde
> >>  Software Developer
> >>  Paradyne Infotech Limited , Mumbai
> >>  09324546711
> >>
> >>  "There are three kinds of lies: lies, damn lies, and statistics."
> >>  -Benjamin Disraeli
> >>
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> >------- End of Original Message -------
> >
> >
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> 
> -- 
> Joe Germuska            
> Joe@Germuska.com  
> http://blog.germuska.com    
> "Narrow minds are weapons made for mass destruction"  -The Ex
> 
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