Java recursive function to find the sum of first n natural numbers

Write a Java Program using recursion to find the sum of first n natural numbers.

import java.util.*;
class NaturalSum
{
    
    int sum(int n)
    {
       if(n==0)
       {
           return 0;
       }
       else
       {           
           return (n+sum(n-1));
       }
       
    }    
    public static void main(String arr[])
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter the value of n : ");
        int n=sc.nextInt();
        NaturalSum obj=new NaturalSum();
        int ans=obj.sum(n);
        System.out.println("Sum first "+n+" natural numbers are: "+ans);
        
    }
}

Enter the value of n : 

10

Sum first 10 natural numbers are: 55