commit 0518aa1df2261ec6e3df3d0959f9189d9628a8d8
Author: wxy <14293288+zysysys@user.noreply.gitee.com>
Date: Thu Aug 8 09:05:02 2024 +0800
day19日考
diff --git a/.gitignore b/.gitignore
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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
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diff --git a/.idea/$PROJECT_FILE$ b/.idea/$PROJECT_FILE$
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diff --git a/.idea/.gitignore b/.idea/.gitignore
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+++ b/.idea/.gitignore
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+# 默认忽略的文件
+/shelf/
+/workspace.xml
+# 基于编辑器的 HTTP 客户端请求
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
diff --git a/.idea/encodings.xml b/.idea/encodings.xml
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--- /dev/null
+++ b/.idea/encodings.xml
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+
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+
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diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
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--- /dev/null
+++ b/.idea/inspectionProfiles/Project_Default.xml
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+
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+
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diff --git a/.idea/misc.xml b/.idea/misc.xml
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--- /dev/null
+++ b/.idea/misc.xml
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+
+
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+
+ 用户定义
+
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diff --git a/.idea/qaplug_profiles.xml b/.idea/qaplug_profiles.xml
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+++ b/.idea/qaplug_profiles.xml
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diff --git a/.idea/setting.xml b/.idea/setting.xml
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--- /dev/null
+++ b/.idea/setting.xml
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+
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+
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
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--- /dev/null
+++ b/.idea/vcs.xml
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\ No newline at end of file
diff --git a/pom.xml b/pom.xml
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--- /dev/null
+++ b/pom.xml
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+
+
+ 4.0.0
+
+ com.bwie
+ spring-8.8
+ 1.0-SNAPSHOT
+
+
+ 17
+ 17
+ UTF-8
+
+
+
+
+
+
+ org.projectlombok
+ lombok
+ 1.18.32
+ provided
+
+
+
+
diff --git a/src/main/java/com/bwie/Student.java b/src/main/java/com/bwie/Student.java
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+++ b/src/main/java/com/bwie/Student.java
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+package com.bwie;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.math.BigDecimal;
+
+/**
+ * @Author: wangxinyuan
+ * @Date: 2024/8/8 上午8:36
+ */
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Student {
+
+
+ private Integer id;
+
+ private String name;
+
+ private String subject;
+
+ private Double score;
+
+
+
+
+
+}
diff --git a/src/main/java/com/bwie/Test.java b/src/main/java/com/bwie/Test.java
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+++ b/src/main/java/com/bwie/Test.java
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+package com.bwie;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * @Author: wangxinyuan
+ * @Date: 2024/8/8 上午8:37
+ */
+public class Test {
+ public static void main(String[] args) {
+
+ // 创建5名学生对象
+ List students = new ArrayList<>();
+ students.add(new Student(1, "张三", "语文", 100.65));
+ students.add(new Student(2, "李四", "数学", 94.47));
+ students.add(new Student(3, "王五", "英语", 78.77));
+ students.add(new Student(4, "赵六", "化学", 82.43));
+ students.add(new Student(5, "田七", "科学", 69.24));
+
+ //将所有学生拼接字符串放入集合中,如：1,张三,语文,100 2,张三,数学,90。
+ List studentStrings = students.stream()
+ .map(student -> String.format("%d,%s,%s,%.2f", student.getId(),
+ student.getName(), student.getSubject(),
+ student.getScore()))
+ .toList();
+
+
+ // 使用stream操作集合并输出每个人的名字及其平均成绩
+ students.stream()
+ .collect(Collectors.groupingBy(Student::getName,
+ Collectors.averagingDouble(Student::getScore)))
+ .forEach((name, avgScore) -> System.out.println(name + " 的平均成绩为: " + avgScore));
+
+ // 输出所有学生的拼接字符串
+ studentStrings.forEach(System.out::println);
+
+
+ }
+}