package Demo_2_7_Comparable比较接口;

import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        Person[] data = new Person[]{
                new Person("张三-A",19),
                new Person("李四-B",21),
                new Person("王五-C",12)
        };
        Arrays.sort(data);
        System.out.println(Arrays.toString(data));
    }
}
class Person implements Comparable<Person>{
    private String name;
    private int age;

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

    @Override
    public int compareTo(Person person) {
        return this.age - person.age;
    }

    @Override
    public String toString() {
        return "name: " + this.name + "\tage: " + this.age;
    }
}

面试题:

请解释Comparable 与 Comparator的区别?
　　- java.lang.Comparable是在类定义的时候实现的父接口，主要用于定义排序规则，里面只有一个compareTo()方法

　　- java.util.Comparator是挽救的比较器操作，需要设置单独的比较器规则类实现排序，里面有compare()方法