完成异常处理作业：ScoreAverageCalculator

w8/ScoreAverageCalculator.java

@@ -0,0 +1,49 @@
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class ScoreAverageCalculator {
+    public static void main(String[] args) {
+        String fileName = "scores.txt";
+        int sum = 0;
+        int count = 0;
+        
+        // try-with-resources 自动关闭流
+        try (BufferedReader br = new BufferedReader(new FileReader(fileName))) {
+            String line;
+            
+            while ((line = br.readLine()) != null) {
+                // 跳过空行
+                if (line.trim().isEmpty()) {
+                    continue;
+                }
+                
+                try {
+                    int score = Integer.parseInt(line.trim());
+                    sum += score;
+                    count++;
+                } catch (NumberFormatException e) {
+                    // 数字格式错误处理
+                    System.err.println("数字格式错误，忽略该行内容: " + line);
+                }
+            }
+            
+            // 计算并输出平均分
+            if (count > 0) {
+                double average = (double) sum / count;
+                System.out.println("成功读取 " + count + " 个成绩");
+                System.out.println("总分: " + sum);
+                System.out.println("平均分: " + average);
+            } else {
+                System.err.println("文件中没有有效的成绩数据");
+            }
+            
+        } catch (IOException e) {
+            // 文件不存在或读取错误处理
+            System.err.println("文件操作错误: " + e.getMessage());
+            if (e instanceof java.io.FileNotFoundException) {
+                System.err.println("请检查文件 \"" + fileName + "\" 是否存在");
+            }
+        }
+    }
+}