完成w7作业

w7/.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+.kotlin
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

w7/.idea/.gitignore

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+# 默认忽略的文件
+/shelf/
+/workspace.xml
+# 已忽略包含查询文件的默认文件夹
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# 基于编辑器的 HTTP 客户端请求
+/httpRequests/

w7/.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="21" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

w7/.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/w7.iml" filepath="$PROJECT_DIR$/w7.iml" />
+    </modules>
+  </component>
+</project>

w7/.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>

w7/scores.txt

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+90
+99
+100
+98
+96

w7/src/Main.java

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+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class Main {
+    public static void main(String[] args) {
+        int sum = 0;
+        int count = 0;
+        try (BufferedReader br = new BufferedReader(new FileReader("scores.txt"))){
+            String line;
+            while ((line = br.readLine())!= null){
+                line = line.trim();
+                if(line.isEmpty()){
+                    continue;
+                }
+                int score = Integer.parseInt(line);
+                sum +=score;
+                count++;
+            }
+            if (count > 0){
+                double avg = (double)sum / count;
+                System.out.println("平均分："+avg);
+
+            } else {
+                System.out.println("文件中无有效成绩");
+            }
+        } catch (NumberFormatException e){
+            System.out.println("文字内容不是数字，无法转换为成绩");
+
+        } catch (java.io.FileNotFoundException e){
+            System.out.println("错误，找不到scores.txt文件");
+        } catch (IOException e){
+            System.out.println("文件操作异常："+e.getMessage());
+        }
+
+    }
+}

w7/w7.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>