asked on

validating a format xxx.xxxx

hi guys

I have a requirment where i have a decimal field 'rate' and rate
can be in format xxx or xxx.xxxx

for example rate can be 123 or 123.0000 or 123.3333. These are all valid rates

any idea how i can validate the rate in my java class

String rate = null;
if(rate is not in format xxx or xxx.xxxx)
{

//throw error

}

any idea, how i do this?

thanks
J

Ajay-Singh

You can use this,

Number x = new DecimalFormat("###.###").parse("122.222");

jaggernat

ASKER

ok,thanks but i dint completely understand

>>>Number x = new DecimalFormat("###.###").parse("122.222");

this is what i have so far

String rate = "";
if (rate != "" && rate.length() > 0)

{
how do i use the above code here (Number x = new DecimalFormat("###.###").parse("122.222");)
}

thanks

manuel_m

String rate = "122.222";
try {
  Number x = new DecimalFormat("###.###").parse(rate);
} catch (ParseException ex) {
  ex.printStackTrace();
}

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Ajay-Singh

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manuel_m

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CEHJ

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CEHJ

(My comment takes your comment literally)

jaggernat

ASKER

thanks all

CEHJ

You might as well use Double.parseDouble, since those NumberFormat let most things through. Try

3.splat

for instance ;-)

manuel_m

hello CEHJ

could you please explain this part of the regex?
(?: .... )?

thank you.

manuel

CEHJ

a. Don't save it
b. Allow one or zero occurences of it

(I assume you know what 'it' is - if not, let me know)

manuel_m

Yes, I know what 'it' is. Thank you for your response and your explanation!