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));
    }
}