初始化

src/main/java/com/example/StudentApplication.java

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+package com.example;
+
+import com.example.domain.Student;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class StudentApplication {
+    public static void main(String[] args) {
+        // 设置编码（仅在需要时启用）
+        try {
+            System.setOut(new java.io.PrintStream(System.out,true,"UTF-8"));
+        } catch (java.io.UnsupportedEncodingException e) {
+            System.err.println("无法设置UTF-8编码：" + e.getMessage());
+        }
+        // 创建一个学生集合，包含5个学生信息。
+        List<Student> students = new ArrayList<>();
+        // 添加学生信息
+        students.add(new Student(1,"张三","语文",100));
+        students.add(new Student(2,"张三","数学",90));
+        students.add(new Student(3,"李四","英语",80));
+        students.add(new Student(4,"李四","物理",85));
+        students.add(new Student(5,"王五","化学",95));
+
+        // 使用Stream API将学生信息转换为字符串集合
+        List<String> studentStrings = students.stream()
+                .map(Student::toString)
+                .collect(Collectors.toList());
+
+        // 打印拼接后的字符串集合
+        System.out.println("学生信息集合:");
+        studentStrings.forEach(System.out::println);
+
+
+        //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, averageScore) -> System.out.println("姓名：" + name + "，平均成绩：" + averageScore));
+    }
+}

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

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+package com.example.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class Student {
+    private int id;
+    private String name;
+    private String subject;
+    private double score;
+}