feat:W7

W7/ScoreAverage.java

@@ -0,0 +1,35 @@
+package W7;
+
+public class ScoreAverage {
+    public void main(String[] args){
+        String filePath = "scores.txt";
+        int sum = 0;
+        int count = 0;
+        try (BufferedReader br = new BufferedReader(new FileReader(filePath))){
+            String line;
+            while ((line = br.readLine()) != null){
+                line=line.trim();
+                if (line.isEmpty()){
+                    continue;
+                }
+                try{
+                    int score=Integer.parseInt(line);
+                    sum += score;
+                    count++;
+                }catch (NumberFormatException e){
+                    System.err.println("无效的数字：" + line);
+                }
+            }
+            if (count==0){
+                System.out.println("文件中没有有效成绩");
+            }else{
+                double average = (double) sum / count;
+                System.out.println("平均成绩为：" + average);
+            }
+        }catch (FileNotFoundException e){
+            System.err.println("文件不存在：" + filePath);
+        }catch (IOException e){
+            System.err.println("读取文件时出错：" + e.getMessage());
+        }
+    }
+}

W7/ScoreCalculator.java

@@ -0,0 +1,11 @@
+package W7;
+
+public class ScoreCalculator {
+    BufferedReader br=new BufferedReader(new FileReader("scores.txt"));
+    String line;
+    while ((line=br.readLine())!=null){
+        sum +=Integer.parseInt(line);
+    }
+    br.close();
+}
+