Large sum (Java 8 ver) Sample by ClearNB

Solution.java

import java.math.BigInteger;
import java.util.Scanner;

public class Solution {
    
    public static void main(String[] args) {
        BigInteger bi = new BigInteger("0");
        try (Scanner sc = new Scanner(System.in)) {
            int N = sc.nextInt();
            for(int i = 0; i < N; i++) {
                BigInteger nl = sc.nextBigInteger();
                bi = bi.add(nl);
            }
            System.out.println(bi.toString().substring(0, 10));
        }
    }
}