日考19

.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea
+*.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

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.bw</groupId>
+    <artifactId>day19</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.34</version>
+        </dependency>
+    </dependencies>
+</project>

src/main/java/com/bw/domain/StuAvg.java

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+package com.bw.domain;
+
+
+import lombok.*;
+
+/**
+ * @Author: 胡杨
+ * @Name: StuAvg
+ * @Description: 学生平均成绩表
+ * @CreatedDate: 2024/8/8 上午8:41
+ * @FilePath: com.bw.domain
+ */
+@Data
+@Builder
+@ToString
+@NoArgsConstructor
+@AllArgsConstructor
+public class StuAvg {
+    private String name;
+    private Double score;
+    private Integer num;
+}

src/main/java/com/bw/domain/Student.java

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+package com.bw.domain;
+
+import lombok.*;
+
+/**
+ * @Author: 胡杨
+ * @Name: Student
+ * @Description: 学生类
+ * @CreatedDate: 2024/8/8 上午8:37
+ * @FilePath: com.bw.domain
+ */
+
+@Data
+@Builder
+@ToString
+@NoArgsConstructor
+@AllArgsConstructor
+public class Student {
+    private Integer id;
+    private String name;
+    private String subjects;
+    private Double score;
+}

src/test/java/com/bw/day19.java

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+package com.bw;
+
+/**
+ * @Author: 胡杨
+ * @Name: day19
+ * @Description: 日考19
+ * @CreatedDate: 2024/8/8 上午8:36
+ * @FilePath: com.bw
+ */
+
+
+import com.bw.domain.StuAvg;
+import com.bw.domain.Student;
+
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+/**
+ * @Author: 胡杨
+ * @Name: day19
+ * @Description: 日考19
+ * @CreatedDate: 2024/8/8 上午8:36
+ * @FilePath: com.bw
+ */
+
+public class day19 {
+    public static void main(String[] args) {
+        // 学生成绩
+        List<Student> students = new ArrayList<>();
+        students.add(new Student(1, "张三","语文", 90.0));
+        students.add(new Student(2, "张三","英语", 55.0));
+        students.add(new Student(3, "张三","数学", 99.0));
+        students.add(new Student(4, "李四","语文", 20.0));
+        students.add(new Student(5, "李四","英语", 12.0));
+        students.add(new Student(6, "李四","数学", 43.0));
+
+        // 使用stream流获取学生成绩
+        HashMap<String,Double> hmap = new HashMap<>();
+        students.stream().sorted().map(stu -> {
+            int n = 0;
+            for (String key : hmap.keySet()) {
+                if (stu.getName().equals(key)){
+                    n = 1;
+                }
+            }
+            if (n == 0){
+                hmap.put(stu.getName(),stu.getScore());
+            }else{
+                hmap.put(stu.getName(),hmap.get(stu.getName())+stu.getScore());
+            }
+
+            return stu;
+        });
+
+        // 输出学生成绩
+        hmap.forEach((k,v) -> {
+            System.out.println(k + "  " + v/3);
+        });
+    }
+}