# Java Program to Find Sum of Digits in a String

In this blog post, you will see how to Find the sum of digits in a string using Java. A string can have any characters. Here we will find the digit characters in a given string and calculate their sum.

Procedure to calculate the sum of digits in a String:

1. Declare and Initialize a String variable.
2. Declare a sum variable to hold the sum of digits.
3. Use the `charAt()` method to extract a single character from a given String.
4. Now use the `isDigit()` method to check character is a digit or not, if yes add it to the sum variable else ignore it.
5. Before adding the digit to the sum, convert it to an integer from a character using `getNumericValue()` method of `Character `class.
6. Repeat the 3 to 5 steps until the end of the String.
7. Finally, print the total sum.

Let’s see a few examples for it below:

## Example-1. Calculate the sum of all numbers in a string in Java

```package com.javacodepoint.string;

public class SumOfDigitInString {

// Method to calculate sum of digits
public static int sumOfDigitInString(String str) {
// initialize sum variable
int sum = 0;

for (int i = 0; i < str.length(); i++) {
// extract single character from string
char ch = str.charAt(i);

// check digit character
if (Character.isDigit(ch)) {

// convert character to digit and add into sum variable
int digit = Character.getNumericValue(ch);
sum = sum + digit;
}
}
// finally return the calculated sum
return sum;
}

// Main method
public static void main(String[] args) {

// Declare and Initialize a string (with digits)
String stringWithDigit = "1ab26xyz88www5";

// Find the sum
int sum = sumOfDigitInString(stringWithDigit);

// Print the result
System.out.println("The sum of total available digits in the given String= " + sum);

}

}

```

OUTPUT:

The sum of total available digits in the given String= 30

## Example-2. Sum of digits in a String in Java using Scanner

In this example, we will take string input from the user using `java.lang.Scanner` class. The `next()` method of the Scanner class is used to read a string from the user input device. let’s see the java program below:

```package com.javacodepoint.string;

import java.util.Scanner;

public class SumOfDigitInString2 {

// Method to calculate sum of digits
public static int sumOfDigitInString(String str) {
// initialize sum variable
int sum = 0;

for (int i = 0; i < str.length(); i++) {
// extract single character from string
char ch = str.charAt(i);

// check digit character
if (Character.isDigit(ch)) {

// convert character to digit and add into sum variable
int digit = Character.getNumericValue(ch);
sum = sum + digit;
}
}
// finally return the calculated sum
return sum;
}

// Main method
public static void main(String[] args) {

// Scanner object to read user input
Scanner sc = new Scanner(System.in);

System.out.println("Enter a string with digit characters: ");
String stringWithDigit = sc.next();

// Find the sum
int sum = sumOfDigitInString(stringWithDigit);

// Print the result
System.out.println("The sum of total available digits in the given String= " + sum);

}

}

```

OUTPUT:

Enter a string with digit characters:
java12345codepoint
The sum of total available digits in the given String= 15