java/w7/SaveAerage.java

package w7;

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

public class SaveAerage {
    public static void main([String[] args]){
        String filePath = "scores.txt";
        int sum = 0;
        int count = 0;
        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
            String line;
            while ((line = br.readLine()) != null) {
                int score = Integer.parseInt(line.trim());
                sum += score;
                count++;
            } catch (NumberFormatException e) {
                System.out.printlm("数字格式错误，跳过无效数据: "  + line);   
            }
        } 
        if (count == 0) {
            System.out.println("文件中没有有效成绩数据");
        } else {
            double average = (double) sum / count;
            System.out.println("平均分: %.2f%n" ,average);
        }
    } catch (java.io.FileNotFoundException e) {
        System.err.println("错误：文件不存在 —— " + filePath);
    } catch (IOException e) {
        System.err.println("错误：读取文件时发生异常 —— " + e.getMessage());
    }
}