java/w8/ScoreReader.java

package org.example;

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

public class ScoreReader {
    public static void main(String[] args) {

        int sum = 0;
        int count = 0;

        // try-with-resources：自动关闭流，不需要手动 br.close()
        try (BufferedReader br = new BufferedReader(new FileReader("scores.txt"))) {

            String line;
            while ((line = br.readLine()) != null) {
                try {
                    sum += Integer.parseInt(line.trim());
                    count++;
                } catch (NumberFormatException e) {
                    // 处理数字格式错误
                    System.out.println("跳过无效数据：" + line);
                }
            }

            if (count > 0) {
                double average = (double) sum / count;
                System.out.println("总分：" + sum);
                System.out.println("人数：" + count);
                System.out.printf("平均分：%.2f%n", average);
            } else {
                System.out.println("文件中没有有效成绩。");
            }

        } catch (FileNotFoundException e) {
            // 处理文件不存在
            System.out.println("错误：找不到文件 scores.txt，请检查路径。");
        } catch (IOException e) {
            // 处理读取错误
            System.out.println("错误：读取文件时发生异常：" + e.getMessage());
        }
    }
}