[백준]11650 : 좌표 정렬하기 / JAVA, compareTo

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

class pointerClass implements Comparable<pointerClass> {

	int x;
	int y;

	public pointerClass(int x, int y) {
		super();
		this.x = x;
		this.y = y;
	}

	@Override
	public int compareTo(pointerClass p) {
		if (this.x != p.x) {
			return this.x - p.x;
		}
		return this.y - p.y;
	}
}

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st = new StringTokenizer(br.readLine());
		int n = Integer.parseInt(st.nextToken());
		ArrayList<pointerClass> pointers = new ArrayList<>();
		for (int i = 0; i < n; i++) {
			st = new StringTokenizer(br.readLine());
			int x = Integer.parseInt(st.nextToken());
			int y = Integer.parseInt(st.nextToken());
			pointers.add(new pointerClass(x, y));
		}

		Collections.sort(pointers);
		for (int i = 0; i < n; i++) {
			System.out.print(pointers.get(i).x + " ");
			System.out.println(pointers.get(i).y);
		}
	}
}

 

11650번: 좌표 정렬하기