java/w7/MainSeven.java

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class MainSeven {

    private static int parseLine(String line) throws InvalidInputException {
        String trimmed = line.trim();
        if (trimmed.isEmpty()) {
            throw new InvalidInputException();
        }

        try {
            return Integer.parseInt(trimmed);
        } catch (NumberFormatException e) {
            throw new InvalidInputException(trimmed, e);
        }
    }

    public static void main(String[] args) {
        try (FileReader fr = new FileReader("scores.txt")) {
            BufferedReader br = new BufferedReader(fr);

            int sum = 0;
            String line;
            while ((line = br.readLine()) != null) {
                try {
                    sum += parseLine(line);
                } catch (InvalidInputException e) {
                    System.out.println(e.getMessage());
                }
            }

            br.close();
            System.out.println(sum);
        } catch (FileNotFoundException e) {
            System.out.println("File not found: " + e.getMessage());
        } catch (IOException e) {
            System.out.println("IOException: " + e.getMessage());
        }
    }
}