Java TreeSet 添加自定义对象 必须指定排序规则

package com.zhong.collection.set;

import java.util.Comparator;
import java.util.TreeSet;

public class TreeSetDemo {
    public static void main(String[] args) {
        // TreeSet 添加自定义数据类型 应该自定义排序规则
        TreeSet<Stu> stus = new TreeSet<>((Comparator.comparingInt(Stu::getAge)));
//        TreeSet<Stu> stus = new TreeSet<>(((o1, o2) -> o1.getAge()- o2.getAge()));
        stus.add(new Stu("小钟", 22));
        stus.add(new Stu("小钟", 22));
        stus.add(new Stu("小王", 21));
        stus.add(new Stu("张三", 60));
        stus.add(new Stu("张三", 80));
        for (Stu student : stus) {
            System.out.println(student);
        }
    }
}
class Stu {
    private String name;
    private int age;

    public Stu() {
    }

    public Stu(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

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