8.8

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/inspectionProfiles/Project_Default.xml

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+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="JavaDoc" enabled="true" level="WARNING" enabled_by_default="true">
+      <option name="TOP_LEVEL_CLASS_OPTIONS">
+        <value>
+          <option name="ACCESS_JAVADOC_REQUIRED_FOR" value="none" />
+          <option name="REQUIRED_TAGS" value="" />
+        </value>
+      </option>
+      <option name="INNER_CLASS_OPTIONS">
+        <value>
+          <option name="ACCESS_JAVADOC_REQUIRED_FOR" value="none" />
+          <option name="REQUIRED_TAGS" value="" />
+        </value>
+      </option>
+      <option name="METHOD_OPTIONS">
+        <value>
+          <option name="ACCESS_JAVADOC_REQUIRED_FOR" value="none" />
+          <option name="REQUIRED_TAGS" value="@return@param@throws or @exception" />
+        </value>
+      </option>
+      <option name="FIELD_OPTIONS">
+        <value>
+          <option name="ACCESS_JAVADOC_REQUIRED_FOR" value="none" />
+          <option name="REQUIRED_TAGS" value="" />
+        </value>
+      </option>
+      <option name="IGNORE_DEPRECATED" value="false" />
+      <option name="IGNORE_JAVADOC_PERIOD" value="true" />
+      <option name="IGNORE_DUPLICATED_THROWS" value="false" />
+      <option name="IGNORE_POINT_TO_ITSELF" value="false" />
+      <option name="myAdditionalJavadocTags" value="date" />
+    </inspection_tool>
+  </profile>
+</component>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="false" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/zg6-day19.iml" filepath="$PROJECT_DIR$/zg6-day19.iml" />
+    </modules>
+  </component>
+</project>

src/com/bwie/list/Demo01.java

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+package com.bwie.list;
+
+import com.bwie.pojo.Student;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * @Author：张腾
+ * @Package：com.bwie.list
+ * @Project：zg6-day19
+ * @name：Demo01
+ * @Date：2024/8/8 8:38
+ */
+public class Demo01 {
+
+    public static void main(String[] args) {
+        List<Student> list = new ArrayList<>();
+        list.add(new Student(1,"张三","语文",89.5));
+        list.add(new Student(2,"张三","数学",90.0));
+        list.add(new Student(3,"李四","语文",88.5));
+        list.add(new Student(4,"李四","数学",68.0));
+        list.add(new Student(5,"王五","语文",78.0));
+        list.add(new Student(6,"王五","数学",98.0));
+        list.stream()
+                .collect(Collectors.groupingBy(Student::getName,
+                        Collectors.averagingDouble(Student::getScore)))
+                .forEach((stu,score) -> System.out.println("姓名:"+stu+"平均分:"+score));
+    }
+}

src/com/bwie/pojo/Student.java

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+package com.bwie.pojo;
+
+/**
+ * @Author：张腾
+ * @Package：com.bwie.pojo
+ * @Project：zg6-day19
+ * @name：Student
+ * @Date：2024/8/8 8:39
+ */
+public class Student {
+
+    private Integer id;
+    private String name;
+    private String socket;
+    private Double score;
+
+    public Student(Integer id, String name, String socket, Double score) {
+        this.id = id;
+        this.name = name;
+        this.socket = socket;
+        this.score = score;
+    }
+
+    @Override
+    public String toString() {
+        return "编号:" + id +
+                ", 姓名:" + name + '\'' +
+                ", 科目:" + socket + '\'' +
+                ", 分数:" + score;
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getSocket() {
+        return socket;
+    }
+
+    public void setSocket(String socket) {
+        this.socket = socket;
+    }
+
+    public Double getScore() {
+        return score;
+    }
+
+    public void setScore(Double score) {
+        this.score = score;
+    }
+
+    public Student() {
+    }
+}

zg6-day19.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>