HR30 Day 19: Interfaces/Java

개요

• HR30 Day 19: Interfaces
• 참고: HR자바 Java Interface

import java.io.*;
import java.util.*;

interface AdvancedArithmetic{
    int divisorSum(int n);
}

class Calculator implements AdvancedArithmetic {
    public int divisorSum(int n) {
        int sum = 0;
        for(int i=1; i<=n; i++) {
            if( n%i == 0 ) sum += i;
        }
        return sum;
    }
}

class Solution {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        scan.close();
        
      	AdvancedArithmetic myCalculator = new Calculator(); 
        int sum = myCalculator.divisorSum(n);
        System.out.println("I implemented: " + myCalculator.getClass().getInterfaces()[0].getName() );
        System.out.println(sum);
    }
}