上传文件至 'w7'

w7/AverageScoreBefore.java

@@ -0,0 +1,18 @@
+package java01;
+
+// 加上这三行！
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class AverageScoreBefore {
+    public static void main(String[] args) throws Exception {
+        int sum = 0;
+        BufferedReader br = new BufferedReader(new FileReader("scores.txt"));
+        String line;
+        while ((line = br.readLine()) != null) {
+            sum += Integer.parseInt(line);
+            br.close(); 
+        }
+    }
+}

w7/ScoreAverage.java

@@ -0,0 +1,41 @@
+package java01;  
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+public class ScoreAverage {
+    public static void main(String[] args) {
+        int sum = 0;
+        int count = 0;
+        try (BufferedReader br = new BufferedReader(new FileReader("scores.txt"))) {
+            String line;
+            while ((line = br.readLine()) != null) {
+                line = line.trim();
+                if (line.isEmpty()) {
+                    continue;
+                }
+
+                try {
+                    int score = Integer.parseInt(line);
+                    sum += score;
+                    count++;
+                } catch (NumberFormatException e) {
+                    System.out.println("无效数据，跳过：" + line);
+                }
+            }
+
+            if (count > 0) {
+                double average = (double) sum / count;
+                System.out.println("总分：" + sum);
+                System.out.println("有效人数：" + count);
+                System.out.printf("平均分：%.2f\n", average);
+            } else {
+                System.out.println("无有效成绩");
+            }
+
+        } catch (java.io.FileNotFoundException e) {
+            System.out.println("错误：未找到 scores.txt 文件");
+        } catch (IOException e) {
+            System.out.println("读取文件时发生IO异常");
+        }
+    }
+}