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";
        calculateAverage(fileName);
    }
    
    public static void calculateAverage(String fileName) {
        int sum = 0;
        int count = 0;
        
        // 使用try-with-resources确保流被关闭
        try (BufferedReader br = new BufferedReader(new FileReader(fileName))) {
            String line;
            while ((line = br.readLine()) != null) {
                try {
                    // 尝试解析数字
                    int score = Integer.parseInt(line);
                    sum += score;
                    count++;
                } catch (NumberFormatException e) {
                    System.out.println("警告: 无法解析行 '" + line + "' 为数字，跳过该行");
                }
            }
            
            // 计算平均分
            if (count > 0) {
                double average = (double) sum / count;
                System.out.println("总分: " + sum);
                System.out.println("总人数: " + count);
                System.out.println("平均分: " + average);
            } else {
                System.out.println("没有有效的分数数据");
            }
            
        } catch (IOException e) {
            System.out.println("错误: 无法读取文件 '" + fileName + "'");
            System.out.println("原因: " + e.getMessage());
        }
    }
}