上传文件至 'w7'

w7/ScoreCalculator.java

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+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class ScoreCalculator {
+    public static void main(String[] args) {
+        String fileName = "scores.txt";
+        calculateAverage(fileName);
+    }
+    
+    public static void calculateAverage(String fileName) {
+        int sum = 0;
+        int count = 0;
+        
+        // 使用try-with-resources确保流被关闭
+        try (BufferedReader br = new BufferedReader(new FileReader(fileName))) {
+            String line;
+            while ((line = br.readLine()) != null) {
+                try {
+                    // 尝试解析数字
+                    int score = Integer.parseInt(line);
+                    sum += score;
+                    count++;
+                } catch (NumberFormatException e) {
+                    System.out.println("警告: 无法解析行 '" + line + "' 为数字，跳过该行");
+                }
+            }
+            
+            // 计算平均分
+            if (count > 0) {
+                double average = (double) sum / count;
+                System.out.println("总分: " + sum);
+                System.out.println("总人数: " + count);
+                System.out.println("平均分: " + average);
+            } else {
+                System.out.println("没有有效的分数数据");
+            }
+            
+        } catch (IOException e) {
+            System.out.println("错误: 无法读取文件 '" + fileName + "'");
+            System.out.println("原因: " + e.getMessage());
+        }
+    }
+}

w7/scores.txt

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+85
+90
+78
+92
+88