[백준-11650번/Java] 좌표 정렬하기

* Interface Comparable, copareTo method override 하여 좌표를 정렬하였다.

import java.io.*;
import java.util.*;

public class Main {

	private static class Point implements Comparable {
		int x;
		int y;

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

		public Integer getX() {
			return this.x;
		}

		public Integer getY() {
			return this.y;
		}

		@Override
		public boolean equals(Object o) {
			Point p = (Point) o;
			return p.getX() == getX() && p.getY() == getY();
		}

		@Override
		public int compareTo(Object o) {
			Point p = (Point) o;
			return Comparator.comparing(Point::getX).thenComparing(Point::getY).compare(this, p);
		}

		@Override
		public String toString() {
			return getX() + " " + getY();
		}
	}

	public static void main(String[] args) throws IOException {

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		int N = Integer.parseInt(br.readLine());
		ArrayList<Point> pointList = new ArrayList<Point>();

		for (int i = 0; i < N; i++) {
			StringTokenizer stk = new StringTokenizer(br.readLine());
			pointList.add(new Point(Integer.parseInt(stk.nextToken()), Integer.parseInt(stk.nextToken())));
		}

		Collections.sort(pointList);

		for (Point point : pointList) {
			System.out.println(point.toString());
		}

	}
}