Comparable自定义比较规则（2022-01-17）

package demo;

import java.util.Arrays;

class Person implements Comparable<Person>{     //实现Comparable接口
    private String name;
    private int age;
    
    public Person(String name,int age) {
        this.name=name;
        this.age=age;
    }
    public String toString() {
        return "[姓名]"+this.name+"[年龄]"+this.age;
    }
    @Override       //覆写compareTo方法，定义比较规则
    public int compareTo(Person per) {
        return this.age - per.age;
    }
}

public class ComparableDemo {

    public static void main(String[] args) {        
        Person[] person = new Person[] {
                new Person("张三", 50),
                new Person("李四", 30),
                new Person("王五", 100)
        };
        Arrays.sort(person);        //定义比较规则后，就可以用数组排序，通常设为升序
        System.out.println(Arrays.toString(person));
    };

}