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How to verify if value is numeric

bob connolly
Ranch Hand

Joined: Mar 10, 2004
Posts: 204
Hello,

If i have a string that contains a numeric value ie '544' for instance, is there a method that can tell me if the value is numeric?

thanks!
Ken Blair
Ranch Hand

Joined: Jul 15, 2003
Posts: 1078
Define "numeric". Is 0xA80 numeric? What about FF or 909.09? Generally speaking if you're talking about an integral value in base 10 you could use String.matches("-?\\d+") (I think) or you could try passing it to Integer.parseInt() and catching the exception if it occurs. If it's more complicated than that then you'll have to get more specific I think.
[ October 27, 2006: Message edited by: Ken Blair ]
BobC
Greenhorn

Joined: Nov 24, 2005
Posts: 4
Thanks Ken, going to try that parseInt, sounds like a good idea, don't mind if it exceptions out!

Have a nice weekend Ken!
Sudhakar Reddy Kurakula
Ranch Hand

Joined: Aug 19, 2006
Posts: 42
Hi
This is the code.

string s="345"
if(Integer.parseInt(s)>=0)
s.o.p("this is integer");
else
s.o.p("not");

Cheers
Sudhakar Reddy
M.C.A(2006)
Satyam.
9989223696
Stan James
(instanceof Sidekick)
Ranch Hand

Joined: Jan 29, 2003
Posts: 8791
Test that with "abc" and I think you'll find the exception the earlier posts were talking about.


A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi
 
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subject: How to verify if value is numeric