Regarding String Validation

Hi,

In my program i am converting a string to a long. val is a string variable. when Long.parseLong(Val) executes it throws numberformat exception because val contains a string "COO" . I want to execute parselong function after checking if val is not a string. How do i check val is not having string value?

Regards,
Arav

I would do something like:

or something like that. This allows you to handle it just fine.

Thanks a lot for the info. I don't want to get the Number format exception. I want to check whether the variable has string and do something. Is there any other way to do?

You could put the code I have into a method:

Another alternative is to walk through the String character by character and call Character.isDigit on each character. You'd have to specially check for the minus sign and a period (or comma if you're in a country that uses commas for decimal places).

Lastly, you could write a regular expression to check if the string. This is a bit harder but would work too.