Java/com/study/demo10/LambdaCollection.java

package com.study.demo10;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

class Student {
    String name;
    int score;

    Student(String name, int score) {
        this.name = name;
        this.score = score;
    }

    @Override
    public String toString() {
        return "Student{name='" + name + "', score=" + score + "}";
    }
}

public class LambdaCollection {
    public static void main(String[] args) {
        List<Student> students = new ArrayList<>();
        students.add(new Student("张三", 85));
        students.add(new Student("李四", 92));
        students.add(new Student("王五", 78));

        System.out.println("排序前：");
        students.forEach(s -> System.out.println(s));

        Collections.sort(students, (s1, s2) -> s2.score - s1.score);

        System.out.println("\n排序后（按成绩降序）：");
        students.forEach(s -> System.out.println(s));
    }
}