Interface.java

import java.util.*;
interface AdvancedArithmetic{
 int divisor_sum(int n);
}
//Write your code here
class MyCalculator implements AdvancedArithmetic //class implementing the interface..
{
 public int divisor_sum(int n)
 {
 int i;
 int sum=0;
 for(i=1;i<=n;i++) //calculating the divisors of a particular number....
 {
 if(n%i==0)
 {
 sum = sum+i; //calculating the sum of the divisors....
 }
 }
 return sum;
 }
}

class Solution{
 public static void main(String []args){
 MyCalculator my_calculator = new MyCalculator();
 System.out.print("I implemented: ");
 ImplementedInterfaceNames(my_calculator);
 Scanner sc = new Scanner(System.in);
 int n = sc.nextInt();
 System.out.print(my_calculator.divisor_sum(n) + "\n");
 	sc.close();
 }
 /*
 * ImplementedInterfaceNames method takes an object and prints the name of the interfaces it implemented
 */
 static void ImplementedInterfaceNames(Object o){
 Class[] theInterfaces = o.getClass().getInterfaces();
 for (int i = 0; i < theInterfaces.length; i++){
 String interfaceName = theInterfaces[i].getName();
 System.out.println(interfaceName);
 }
 }
}