Java Interface Hackerrank Solution For Explanation Watch Video: Sample Input 6 Sample Output I implemented: AdvancedArithmetic 12 Code: import java.util.*; interface AdvancedArithmetic{ int divisor_sum( int n); } //Write your code here class MyCalculator implements AdvancedArithmetic{ public int divisor_sum( int n){ int sum = 0 ; for ( int i= 1 ;i<=n;i++){ if (n%i== 0 ){ sum += i; } } return sum; ...