How to find length of alpha numeric value or string

import java.util.Scanner;

//Define functional interface lengthOfAlphanumeric
interface lengthOfAlphanumeric {
	public int lenOfAlphanumeric(String strVal);
}

public class LenOfAlphanumeric {
	public static void main(String[] args) {

		@SuppressWarnings("resource")
		Scanner inpAlphaNum = new Scanner(System.in);

		// Input a long integer
		System.out.print("Enter an Alphanumeric value=");
		String alphaNumeric = inpAlphaNum.next();
		System.out.println("The alphanumeric value is=" + alphaNumeric);

		// Define lambda expression laN which returns length
		lengthOfAlphanumeric laN = alphaNum -> alphaNum.length();

		// Call the lambda expression with parameter as alphanumeric
		System.out.println("The Length of the alphanumeric value=" + alphaNumeric + " is=" + laN.lenOfAlphanumeric(alphaNumeric));
		System.out.println("The Length of other alphanumeric value or string is=" + laN.lenOfAlphanumeric("GdIJJ98YT#21"));
		System.out.println("The Length of other alphanumeric value or string is=" + laN.lenOfAlphanumeric("Drishya"));
	}
}