백준 10814번 - 나이순 정렬 (Java 8)

https://www.acmicpc.net/problem/10814

10814번: 나이순 정렬

객체 정렬기준 설정

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int numOfCase = Integer.parseInt(br.readLine());
        List<Member> list = new ArrayList<>();
        StringTokenizer st;

        for(int i=0; i<numOfCase; i++){
            st = new StringTokenizer(br.readLine());
            int age = Integer.parseInt(st.nextToken());
            String name = st.nextToken();
            list.add(new Member(age, name));
        }
        Collections.sort(list, (Member member1, Member member2)-> {
            for(int i=0; i<list.size()-1; i++){
                if(member1.age == member2.age){
                    return member1.index - member2.index;
                }
            }
            return member1.age - member2.age;
        });

        StringBuilder sb = new StringBuilder();
        for(int i=0; i<list.size(); i++){
            sb.append(list.get(i).age).append(" ").append(list.get(i).name).append("\n");
        }
        System.out.println(sb);
    }
}
class Member{
    int index = 0;
    int age;
    String name;

    public Member() {}
    
    public Member(int age, String name) {
        this.age = age;
        this.name = name;
        this.index++;
    }



}