The document provides a Java program designed for beginners that reads integers from a file named 'numbers.txt' and calculates their sum. It utilizes an ArrayList to store the integers, allowing for dynamic input size. The program includes error handling for file input exceptions.

1. java as a beginner
Solution
//import statements
import java.io.*;
import java.util.Scanner;
import java.util.ArrayList;
public class Calculation{
//main method
public static void main(String[] args) {
//try so that we can catch file input exception
try{
//taking input from file called numbers.txt
Scanner scanner = new Scanner(new File("numbers.txt"));
//declaring numbers arraylist and not array since we don't know the number of integers
present in the file
ArrayList numbers = new ArrayList();
//reading integers from file and adding it to numbers arraylist
while(scanner.hasNextInt()){
numbers.add(scanner.nextInt());
}
//initialising sum
int sum = 0;
//iterating through the list and adding the number
for (int i=0; i