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