diff --git a/ScoreAverage.class b/ScoreAverage.class
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diff --git a/ScoreAverage.java b/ScoreAverage.java
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+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class ScoreAverage {
+    public static void main(String[] args) {
+        // 1. 定义变量：总分、有效成绩数量
+        int sum = 0;
+        int count = 0;
+
+        // 2. 使用 try-with-resources 自动关闭流，确保文件一定被关闭
+        try (BufferedReader br = new BufferedReader(new FileReader("scores.txt"))) {
+            String line;
+            while ((line = br.readLine()) != null) {
+                // 去除首尾空格，避免空行或空格干扰
+                line = line.trim();
+                if (line.isEmpty()) {
+                    continue; // 跳过空行
+                }
+
+                // 3. 解析数字并累加
+                int score = Integer.parseInt(line);
+                sum += score;
+                count++;
+            }
+
+            // 4. 计算并输出平均分（避免除以0）
+            if (count > 0) {
+                double average = (double) sum / count;
+                System.out.println("读取到 " + count + " 个成绩");
+                System.out.printf("总分：%d，平均分：%.2f%n", sum, average);
+            } else {
+                System.out.println("文件中没有有效成绩数据");
+            }
+
+        // 异常1：文件不存在/路径错误
+        } catch (IOException e) {
+            System.out.println("文件读取错误：" + e.getMessage());
+            System.out.println("请检查 scores.txt 文件是否存在，或路径是否正确");
+
+        // 异常2：数字格式错误（比如文件里有非数字内容）
+        } catch (NumberFormatException e) {
+            System.out.println("数据格式错误：文件中包含无法解析为整数的内容");
+            System.out.println("错误详情：" + e.getMessage());
+
+        // 兜底异常，捕获其他意外错误
+        } catch (Exception e) {
+            System.out.println("程序发生意外错误：" + e.getMessage());
+            e.printStackTrace();
+        }
+    }
+}
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diff --git a/scores.txt b/scores.txt
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+++ b/scores.txt
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+85
+92
+78
+90
+88
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