How to find sum of digits in a given float value

import java.util.Scanner;

public class SumofdgtsinFloat {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		@SuppressWarnings("resource")
		Scanner inpFloat= new Scanner(System.in);
		
		//Input a float value
		System.out.println("Enter a float value=");
		float floatNum=inpFloat.nextFloat();
		System.out.println("The Float value is="+floatNum);
		
		//Find out the Length
		float sumDigits=0, numBackUp= floatNum;
		//Convert the two parts of float value into a string
		String twoParts=String.valueOf(floatNum);
		int lenOfFloat=twoParts.length();
		while (lenOfFloat > 0) {
			if (Character.isDigit(twoParts.charAt(lenOfFloat-1)))
			sumDigits=sumDigits+Character.getNumericValue(twoParts.charAt(lenOfFloat-1));
			lenOfFloat=lenOfFloat-1;
		}
		System.out.println("The sum of digits in a given float value "+numBackUp+" is="+sumDigits);
	}
}