How do I find out if first character of a string is a number?

Question

In Java is there a way to find out if first character of a string is a number?

One way is

string.startsWith(\"1\")

and do the abov

Answer 1

IN KOTLIN :

Suppose that you have a String like this :

private val phoneNumber="9121111111"

At first you should get the first one :

val firstChar=phoneNumber.slice(0..0)

At second you can check the first char that return a Boolean :

firstChar.isInt() // or isFloat()