java/W7/ScoreAvg.java

public class ScoreAvg {
    public static void main(String[] args) {
        int sum = 0;
        int count = 0;
        double average = 0;
        try (java.io.BufferedReader br = new java.io.BufferedReader(new java.io.FileReader("scores.txt"))) {
            String line;
            while ((line = br.readLine()) != null) {
                try {
                    int score = Integer.parseInt(line.trim());
                    sum += score;
                    count++;
                } catch (NumberFormatException e) {
                    System.out.println("格式错误跳过该行" + line);
                }
            }
            if (count > 0) {
                average = (double) sum / count;
                System.out.println("总分：" + sum);
                System.out.println("人数：" + count);
                System.out.println("平均分：" + average);
            } else {
                System.out.println("文件内无有效数据");
            }
        } catch (java.io.IOException e) {
            System.out.println("文件操作出错：" + e.getMessage());
        }
    }
}