java/w7/ScoreAvg2.java

package w7;

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

public class ScoreAvg2 {
    public static void main(String[] args) {
        String path = "scores.txt";
        int sum = 0;
        int count = 0;

        try (BufferedReader br = new BufferedReader(new FileReader(path))) {
            String line;
            while ((line = br.readLine()) != null) {

                try {
                    sum += Integer.parseInt(line);
                    count++;
                } catch (NumberFormatException e) {
                    System.err.println("跳过无效数字行：" + line);
                }
            }

            if (count > 0) {
                System.out.printf("平均分：%.2f%n", (double) sum / count);
            } else {
                System.out.println("未读取到有效成绩");
            }
        } catch (IOException e) {

            System.err.println("读取文件失败：" + e.getMessage());
            e.printStackTrace();
        }
    }
}