Comparator

use :

Class로 정의한 Object를 사용자의 용도에 맞게 정렬 할 때 사용

import

import java.util.Comparator

implement

class Persion implements Comparator<Persion> {
    String name;
    String position;
    int age;

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

    @Override
    public int compare(Persion p1, Persion p2) {

        if (p1.age > p2.age) {
            return 1;  //오름차순
        } else if (p1.age < p2.age) {
            return -1; //내림차순
        } else {
            return 0;
        }
    }
}

sort

private static ArrayList<Persion> mTeam;
mTeam = new ArrayList<Persion>();

Persion persion = new Persion(name, position, age);
mTeam.add(persion);

Collections.sort(mTeam, persion);
Collections.reverse(mTeam);