diff --git a/w7/2.png b/w7/2.png
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diff --git a/w7/3.png b/w7/3.png
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diff --git a/w7/4.png b/w7/4.png
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diff --git a/w7/Raw.java b/w7/Raw.java
new file mode 100644
index 0000000..1de8e3b
--- /dev/null
+++ b/w7/Raw.java
@@ -0,0 +1,15 @@
+import java.io.*;
+
+public class Raw {
+    public static void main(String[] args){
+        String filename="w7/Score.txt";
+        int sum=0;
+        int count=0;
+        BufferedReader br=new BufferedReader(new FileReader(filename));
+        String line;
+        while((line= br.readLine())!=null){
+            sum+=Integer.parseInt(line);
+            count++;
+        }
+    }
+}
diff --git a/w7/ScoreCalculate.java b/w7/ScoreCalculate.java
new file mode 100644
index 0000000..af9b424
--- /dev/null
+++ b/w7/ScoreCalculate.java
@@ -0,0 +1,36 @@
+import java.io.*;
+
+public class ScoreCalculate {
+    public static void main(String[] args){
+        String filename="w7/Scores.txt";
+        int sum=0;
+        int count=0;
+        try(BufferedReader br=new BufferedReader(new FileReader(filename))){
+            String line;
+            while((line=br.readLine())!=null){
+                line=line.trim();
+                if(line.isEmpty()){
+                    continue;
+                }
+                sum+=Integer.parseInt(line);
+                count++;
+            }
+            if(count>0){
+                double average=(double)sum/count;
+                System.out.println("平均分为"+average);
+            }
+            else{
+                System.out.println("无有效成绩");
+            }
+        }
+        catch(FileNotFoundException e){
+            System.out.println("文件未找到或不存在:"+e.getMessage());
+        }
+        catch(IOException e){
+            System.out.println("文件读取错误:"+e.getMessage());
+        }
+        catch(NumberFormatException e){
+            System.out.print("文件中包含无法解析为数字的内容:"+e.getMessage());
+        }
+    }
+}
diff --git a/w7/Scores.txt b/w7/Scores.txt
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index 0000000..e69de29
diff --git a/w7/未重构.png b/w7/未重构.png
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diff --git a/w7/重构后1.png b/w7/重构后1.png
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