HR자바 Java Interface

개요

HR자바 Java Interface

• https://www.hackerrank.com/challenges/java-interface/problem
• 참고: HR30 Day 19: Interfaces

HR30 Day 19: Interfaces/Java

해커랭크 Java

#	문제	비고
HR자바 Object Oriented Programming e
43	HR자바 Java Inheritance I
44	HR자바 Java Inheritance II
45	HR자바 Java Abstract Class
46	HR자바 Java Interface
47	HR자바 Java Method Overriding
48	HR자바 Java Method Overriding 2 (Super Keyword)
49	HR자바 Java Instanceof keyword
50	HR자바 Java Iterator

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Java

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import java.util.*;
interface AdvancedArithmetic{
    int divisor_sum(int n);
}

Java

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//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;
    }
}

Java

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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);
        }
    }
}