上传文件至 'w7'

w7/1

@@ -0,0 +1,36 @@
+import java.io.BufferedReader;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class ScoreAverage {
+    public static void main() {
+        double sum = 0;
+        int count = 0;
+        double scoreAverage = 0;
+
+        try(BufferedReader br = new BufferedReader(new FileReader("scores.txt"))) {
+            String line;
+            while ((line = br.readLine()) != null) {
+                sum += Integer.parseInt(line);
+                count += 1;
+            }
+
+            if (count == 0){
+                System.out.println("文件中无有效数据");
+            }else{
+                scoreAverage = sum / count;
+                System.out.printf("由该文件中数据可得平均分为%.2f",scoreAverage);
+            }
+        } catch (FileNotFoundException e) {
+            System.out.println("文件不存在");
+            e.printStackTrace();
+        } catch (NumberFormatException e) {
+            System.out.println("数字格式错误");
+            e.printStackTrace();
+        } catch (IOException e) {
+            System.out.println("文件读取发生错误");
+            e.printStackTrace();
+        }
+    }
+}