WAP to define a method which returns the sum of digits of the given two digit number in Java

In this tutorial we are going to learn about writing a program for the problem statement mentioned below.

Define a method which returns the sum of digits of the given two digit number.
Name of method :getSumOfDigits()
Arguments: one argument of type integer
Return Type: an integer value

Specifications:
If the given value is in between 10 and 99, return sum of it’s digits.
Example: if x = 34, return 7
If the given value is negative, return -3
If the given value is greater than 99, return -2
If the given value is in between 0 and 9, return -1

Sample Code Snippet:

public class Sum {
	public int getSumOfDigits(int n)
	{
		int sum=0;
		if(n>=10 && n<=99)
		{
			while (n != 0)
	        {
	            sum = sum + n % 10;
	            n = n/10;
	        }
			}
		else if(n>99)
		{
			return -2;
		}else if(n>=0 && n<=9)
		{
			return -1;
		}else 
		{
			return -3;
		}
		return sum;
	}
	public static void main(String[] args) {
		//Enables the custom input from the user
		Scanner s=new Scanner(System.in);
		int n=s.nextInt();
			
		Sum obj=new Sum();
		System.out.println(obj.getSumOfDigits(n));
	}
}