HackerRank-Solutions/Java/Advanced/Java Varargs - Simple Addition/Solution.java

//     Author: Rodney Shaghoulian
//     Github: github.com/RodneyShag
// HackerRank: hackerrank.com/RodneyShag

import java.io.*;
import java.lang.reflect.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

// Use a StringBuffer instead of a String since 
// concatening Strings is not efficient.
class Add {
    void add(int... numbers) {
        StringBuffer sb = new StringBuffer();
        int sum = 0;
        for (int num : numbers) {
            sb.append(num + "+");
            sum += num;
        }
        sb.setCharAt(sb.length() - 1, '=');
        sb.append(sum);
        System.out.println(sb);
    }
}

public class Solution {
    public static void main(String[] args) {
       try {
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            int n1 = Integer.parseInt(br.readLine());
            int n2 = Integer.parseInt(br.readLine());
            int n3 = Integer.parseInt(br.readLine());
            int n4 = Integer.parseInt(br.readLine());
            int n5 = Integer.parseInt(br.readLine());
            int n6 = Integer.parseInt(br.readLine());
            Add ob = new Add();
            ob.add(n1,n2);
            ob.add(n1,n2,n3);
            ob.add(n1,n2,n3,n4,n5); 
            ob.add(n1,n2,n3,n4,n5,n6);
            Method[] methods = Add.class.getDeclaredMethods();
            Set<String> set = new HashSet<>();
            boolean overload = false;
            for (int i = 0; i < methods.length; i++) {
                if (set.contains(methods[i].getName())) {
                    overload = true;
                    break;
                }
                set.add(methods[i].getName());
            }
            if (overload) {
                throw new Exception("Overloading not allowed");
            }
        } catch(Exception e) {
                e.printStackTrace();
        }
    }
}