diff --git a/w7/SafeScoreAvg.class b/w7/SafeScoreAvg.class
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diff --git a/w7/SafeScoreAvg.java b/w7/SafeScoreAvg.java
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+++ b/w7/SafeScoreAvg.java
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+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class SafeScoreAvg {
+    public static void main(String[] args) {
+        String filePath = "scores.txt";
+        int sum = 0;
+        int count = 0;
+
+        // 1. 使用 try-with-resources，自动关闭流
+        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
+            String line;
+            while ((line = br.readLine()) != null) {
+                // 去掉前后空格，跳过空行
+                line = line.trim();
+                if (line.isEmpty()) {
+                    continue;
+                }
+
+                // 2. 处理数字格式错误
+                try {
+                    int score = Integer.parseInt(line);
+                    sum += score;
+                    count++;
+                } catch (NumberFormatException e) {
+                    System.err.println("⚠️ 警告：跳过无效成绩行（非数字内容）：" + line);
+                }
+            }
+
+            // 计算并输出结果
+            if (count == 0) {
+                System.out.println("ℹ️ 提示：文件中没有有效成绩数据");
+            } else {
+                double average = (double) sum / count;
+                System.out.printf("✅ 平均分：%.2f%n", average);
+            }
+
+        } catch (IOException e) {
+            // 3. 处理文件不存在、读取错误等IO异常
+            System.err.println("❌ 文件操作失败：" + e.getMessage());
+            e.printStackTrace();
+        }
+    }
+}
\ No newline at end of file
diff --git a/w7/scores.txt b/w7/scores.txt
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+++ b/w7/scores.txt
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+85
+92
+78
+95
+88
+75
+90
+82
+96
+89
+
+70
+88
+abc
+93
+79
+84
+91
+缺考
+87
+76
+99
+81
+94
diff --git a/w7/屏幕截图 2026-04-27 112423.png b/w7/屏幕截图 2026-04-27 112423.png
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