TreeSet的比较器排序Comparator的使用

package com.czie.iot1913.lps.itheima02;

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

/**
 * @author 1944900433@qq.com
 * @date 2022-03-18 22:21
 */
public class TreeSetDemo01 {
    public static void main(String[] args) {
        //TreeSet(Collection<? extends E> c)
        //构造一个新的树集包含在指定集合的元素，根据其元素的自然排序排序。

        TreeSet<Student> ts = new TreeSet<Student>(new Comparator<Student>() {
            @Override
            public int compare(Student s1, Student s2) {
                int num=s1.getAge()-s2.getAge();
                int num2=num==0? s1.getName().compareTo(s2.getName()):num;
                return num2;
            }
        });
        Student s1 = new Student("西施",21);
        Student s2 = new Student("杨玉环",22);
        Student s3 = new Student("貂蝉",20);
        Student s4 = new Student("王昭君",19);
        Student s5 = new Student("昭君",19);
        Student s6 = new Student("昭君",19);

        ts.add(s1);
        ts.add(s2);
        ts.add(s3);
        ts.add(s4);
        ts.add(s5);
        ts.add(s6);

        for (Student s:ts){
            System.out.println(s.getName()+","+ s.getAge());
        }

    }
}

package com.czie.iot1913.lps.itheima02;

import java.util.Objects;

/**
 * @author 1944900433@qq.com
 * @date 2022-03-18 22:20
 */
public class Student {
   private String name;
   private int age;

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        Student student = (Student) o;
        return age == student.age && Objects.equals(name, student.name);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, 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;
    }

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

    public Student() {
    }
}