How to check a string starts with numeric number?

Question

I have a string which contains alphanumeric character.

I need to check whether the string is started with number.

Thanks,

Answer 1

See the isDigit(char ch) method:

https://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Character.html

and pass it to the first character of the String using the String.charAt() method.

Character.isDigit(myString.charAt(0));