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) {
        int sum = 0;
        int count = 0;

        try (BufferedReader br = new BufferedReader(new FileReader("scores.txt"))) {
            String line;
            while ((line = br.readLine()) != null) {
                line = line.trim();
                if (line.isEmpty()) continue;

                try {
                    int score = Integer.parseInt(line);
                    sum += score;
                    count++;
                } catch (NumberFormatException e) {
                    System.err.println("警告：跳过无效数字格式的行 —— " + line);
                }
            }
        } catch (IOException e) {
            System.err.println("错误：文件读取失败 —— " + e.getMessage());
            return;
        }

        if (count == 0) {
            System.err.println("错误：未找到任何有效分数，无法计算平均分。");
            return;
        }

        double average = (double) sum / count;
        System.out.println("总分：" + sum);
        System.out.println("平均分：" + String.format("%.2f", average));
    }
}