1

w7/ScoreCalculator.java

@@ -0,0 +1,38 @@
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class ScoreCalculator {
+    public static void main(String[] args) {
+        String filePath = "scores.txt";
+        int sum = 0;
+        int count = 0;
+
+        // try-with-resources 自动关闭流，无需手动 close()
+        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
+            String line;
+            while ((line = br.readLine()) != null) {
+                try {
+                    // 处理数字格式错误
+                    int score = Integer.parseInt(line.trim());
+                    sum += score;
+                    count++;
+                } catch (NumberFormatException e) {
+                    System.err.println("警告：无法解析分数 '" + line + "'，跳过该数据。");
+                }
+            }
+
+            if (count > 0) {
+                double average = (double) sum / count;
+                System.out.printf("平均分：%.2f%n", average);
+            } else {
+                System.out.println("文件中没有有效分数数据。");
+            }
+
+        } catch (java.io.FileNotFoundException e) {
+            System.err.println("错误：文件不存在，请检查路径 '" + filePath + "'。");
+        } catch (IOException e) {
+            System.err.println("错误：读取文件失败 - " + e.getMessage());
+        }
+    }
+}

w7/Pair.java → w8/Pair.java

@@ -1,4 +1,4 @@
-package w7;
+package w8;
 
 public class Pair<K,V> {
     private K key;