上传至w7文件夹

w7/ScoreAvg.java

@@ -0,0 +1,19 @@
+package w7;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+
+public class ScoreAvg {
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new FileReader("scores.txt"));
+        String line;
+        int sum = 0;
+        int count = 0;
+        while ((line = br.readLine()) != null) {
+            sum += Integer.parseInt(line);
+            count++;
+        }
+        br.close();
+        System.out.println((double) sum / count);
+    }
+}

w7/ScoreAvg2.java

@@ -0,0 +1,36 @@
+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();
+        }
+    }
+}