1、自定義類自然排序

package demo;

import java.util.Arrays;

/**
 * @description: demo20
 * @author: liuyang
 * @create: 2021-08-30 21:35
 */
public class Demo20 {
    public static void main(String[] args) {
        Person p1 = new Person("aa", 300);
        Person p2 = new Person("bb", 30);
        Person p3 = new Person("cc", 310);
        Person p4 
 
= new Person("cc", 2);
        Person[] arr = new Person[] {p1, p2, p3, p4};
        Arrays.sort(arr);
        System.out.println(Arrays.toString(arr));
    }
}

class Person implements Comparable<Person> {
    private String name;
    private double price;

    public Person() {
    }

    public
 
 Person(String name, double price) {
        this.name = name;
        this.price = price;
    }

    public String getName() {
        return name;
    }

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

    public double getPrice() {
        return price;
    }

    public void
 
 setPrice(double price) {
        this.price = price;
    }

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

    @Override
    public int compareTo(Person o) {
        return Double.compare(this.price, o.price);
    }
}