JAVA – File Handling – Count 1s

An array of N integers is given in a file. The program must print the number of 1s in the input. The name of the file is stored in the variable fileName.

Boundary Condition(s):
1 <= N <= 1000

Input File Format:
The first line contains N.
The second line contains N integers separated by space(s).

Output Format:
The first line contains an integer.

Example Input/Output 1:
Input:
4
2 1 3 1

Output:
2

Example Input/Output 2:
Input:
5
1 2 1 1 1

Output:
4

import java.io.*;
import java.util.*;
public class Hello {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String fileName = scan.next();

    FileReader file;
    int count=0;
    try{
        file=new FileReader(fileName);
        Scanner sc=new Scanner(file);
        int n=sc.nextInt();
        while(sc.hasNext()){
            int num=sc.nextInt();
            if(num==1)count++;
        }
        System.out.print(count);
    }
    catch(Exception r){
    }

    }
}