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Message:

Strings of Numbers

Posted by Matt Gerrans on January 25, 2002 at 2:13 PM

> Is there a way one could check whether a value in a text file is a String or an Integer??????
> ex: is this possible ??
> If(val == String)

Well, by definition, all values in text files are strings, but if you want to see if a particular string contains only digits, you could simply try to convert it to an int; if that fails, an exception is thrown. For example:

// Assume you've already read the String s from the file:
try
{
   int value = Integer.parseInt( s );
   // Now, do something interesting with the int value.
}
catch( NumberFormatException nfe )
{
   // Do something interesting with the string value.
}









Replies:




Stringing It Along Matt Gerrans January 25, 2002 at 2:44 PM
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