A small observation from my side that how know string contain only numeric value.
After some a small fight i got the solution it's very simple. There is many ways to find the solution like use
isNumeric() method etc
The solution which was I got that is Regex yes by Regex we can know easily
String x = '123 ';
Pattern numberFormat = Pattern.Compile('[0-9]*');
Matcher numberMatch = numberFormat.matcher(x);
System.debug('::::::::::::::::::::::::::::::::'+numberMatch.Matches());
It is very simple.
Thanks,
Regards,
Ashlekh Gera.
