[백준/자바] 10814 - 나이순 정렬

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 N = Integer.parseInt(br.readLine());

        List<Member> list = new ArrayList<>();
        StringTokenizer st;
        for (int i = 0; i < N; i++) {
            st = new StringTokenizer(br.readLine());
            list.add(new Member(Integer.parseInt(st.nextToken()), st.nextToken()));
        }

        Collections.sort(list);

        for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i).getAge() + " " + list.get(i).getName());
        }
    }
}

class Member implements Comparable<Member> {
    private int age;
    private String name;

    public int getAge() {
        return age;
    }

    public String getName() {
        return name;
    }

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

    @Override
    public int compareTo(Member m) {
        return Integer.compare(this.age, m.age);
    }
}

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참고용 다른 분 풀이

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.StringTokenizer;
 
public class Main {
	public static void main(String[] args) throws IOException {
		
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        
		int N = Integer.parseInt(br.readLine());
 
		
		StringBuilder[] p = new StringBuilder[201];
		
		for(int i = 0; i < p.length; i++) {
			p[i] = new StringBuilder();
		}
		
		for(int i = 0; i < N; i++) {
			StringTokenizer st = new StringTokenizer(br.readLine(), " ");
			int age = Integer.parseInt(st.nextToken());
			String name = st.nextToken();
			p[age].append(age).append(' ').append(name).append('\n');
		}
		
		StringBuilder sb = new StringBuilder();
		for(StringBuilder val : p) {
			sb.append(val);
		}
        
		System.out.println(sb);
	}
}