java/w7/ScoreCalculator.java

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

public class ScoreCalculator {
    public static void main(String[] args) {
        String fileName = "scores.txt";

        try (BufferedReader br = new BufferedReader(new FileReader(fileName))) {
            String line;
            int sum = 0;
            int count = 0;

            while ((line = br.readLine()) != null) {
                try {
                    int score = Integer.parseInt(line.trim());
                    sum += score;
                    count++;
                } catch (NumberFormatException e) {
                    System.err.println("Number format error, skip invalid line: " + line);
                }
            }

            if (count > 0) {
                double average = (double) sum / count;
                System.out.println("Total: " + sum);
                System.out.println("Count: " + count);
                System.out.println("Average: " + average);
            } else {
                System.out.println("No valid score data");
            }

        } catch (IOException e) {
            System.err.println("File read error: " + e.getMessage());
        }
    }
}