java 中根据类的属性排序

package edu.del;

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

class Student implements Comparable<Student>{
    String name;
    int score;

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

    public Student() {

    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getScore() {
        return score;
    }

    public void setScore(int score) {
        this.score = score;
    }

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

//    @Override
//    public int compareTo(Student o) {
//        //假如result返回1。Collections.sort(List)方法就是升序;
//        //假如result返回-1。Collections.sort(List)方法就是降序;
//        int num=new Integer(o.getScore()).compareTo(this.getScore());//这里面是按照降序排列
//        //int num=new Integer(this.getScore()).compareTo(this.getScore()); //测试升序
//        return num;
//
//    }
    @Override
    public int compareTo(Student o) {
        //这里是按照名字字符属性排序
        int num =o.getName().compareTo(this.getName());
        //int num=this.getName().compareTo(o.getName());
        return num;
    }
}

public class sort_class {
    public static void main(String[] args) {
        Scanner scanner =new Scanner(System.in);
        System.out.println("请输入学生数量：");
        int num =scanner.nextInt();
        Student[] student =new Student[num];
        List<Student> list =new ArrayList<>();

        for (int i = 0; i <num ; i++) {

            list.add(new Student(scanner.next(),scanner.nextInt()));
        }
        Collections.sort(list);

        //输出一下看看

        for (int i = 0; i <num ; i++) {
            System.out.print(list.get(i).getName()+" ");
            System.out.println(list.get(i).score);
        }
    }
}