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50 lines
1.9 KiB
50 lines
1.9 KiB
import java.io.BufferedReader;
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import java.io.FileReader;
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import java.io.IOException;
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/**
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* 读取scores.txt文件计算平均分
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* 包含完整异常处理与资源自动关闭
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*/
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public class ScoreAverage {
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public static void main(String[] args) {
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// 初始化总和与计数
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int sum = 0;
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int count = 0;
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// try-with-resources 自动关闭流，无需手动调用 close()
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try (BufferedReader br = new BufferedReader(new FileReader("scores.txt"))) {
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String line;
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// 逐行读取文件
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while ((line = br.readLine()) != null) {
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// 去除行首尾空白（避免空行/空格干扰）
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line = line.trim();
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// 跳过空行
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if (line.isEmpty()) {
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continue;
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}
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// 数字格式转换与累加
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sum += Integer.parseInt(line);
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count++;
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}
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// 计算并输出平均分（处理无数据情况）
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if (count > 0) {
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double average = (double) sum / count;
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System.out.printf("总分：%d，人数：%d，平均分：%.2f%n", sum, count, average);
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} else {
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System.out.println("文件中无有效成绩数据");
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}
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} catch (java.io.FileNotFoundException e) {
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// 捕获：文件不存在/无法读取
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System.out.println("错误：文件未找到 - " + e.getMessage());
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} catch (NumberFormatException e) {
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// 捕获：行内容非有效整数
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System.out.println("错误：数据格式非有效整数 - " + e.getMessage());
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} catch (IOException e) {
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// 捕获：读取文件时的IO异常
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System.out.println("错误：读取文件失败 - " + e.getMessage());
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}
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}
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}
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