Question

Create a text file named “file1.txt” (by use of the notepad editor in Windows for instance) containing the following integer values, one per line:

​12 5 13 56 90 52 82 52

Write a Java program that reads these values from the file and displays their sum on the screen.

Answer 1

import java.io.*;
import java.util.*;
//public class
public class fileNumSum {

public static void main(String args[]){

//scanner
Scanner s=new Scanner(System.in);
//reading filename
System.out.println("Enter the file name :: ");
String name;
name=s.nextLine();
//opening file
try{

File f = new File(name);
Scanner scanner = new Scanner(f);
int sum = 0;
//reading each line
while (scanner.hasNext()){
//adding number to sum
sum += scanner.nextInt();
}
//printing the sum
System.out.println("Sum : "+sum);

}catch(Exception err){
  
}
//end of program

}

}