上传W7

W7/ScoreCalculateorBefore.java

@@ -0,0 +1,15 @@
+public class ScoreCalculateorBefore {
+    public static void main(String[] args) {
+        int sum = 0;
+        int count = 0;
+        BufferedReader br = new BufferedReader(new FileReader("scores.txt"));
+        String line;
+        while ((line = br.readLine()) != null) {
+            sum += Integer.parseInt(line);
+            count++;
+        }
+        br.close();
+        double average = (double) sum / count;
+        System.out.println("Average score: " + average);
+    }
+}

W7/ScoreCalculatorAfter.java

@@ -0,0 +1,31 @@
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class ScoreCalculatorAfter {
+    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) {
+                try {
+                    sum += Integer.parseInt(line);
+                    count++;
+                } catch (NumberFormatException e) {
+                    System.err.println("Invalid number format: " + line);
+                }
+            }
+        } catch (IOException e) {
+            System.err.println("Error reading file: " + e.getMessage());
+        }
+        
+        if (count > 0) {
+            double average = (double) sum / count;
+            System.out.println("Average score: " + average);
+        } else {
+            System.out.println("No valid scores found.");
+        }
+    }
+}