boj - 11650 좌표정렬하기2(자바)

package boj;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;

public class boj_11651 {
    public static void main(String[] args) throws IOException {
        BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter w = new BufferedWriter(new OutputStreamWriter(System.out));

        int count = Integer.parseInt(r.readLine());

        List<List<Integer>> points = new ArrayList<>();

        for(int i=0 ; i<count ; i++){
            List<Integer> point = Arrays.stream(r.readLine().split(" "))
                    .map(Integer::parseInt)
                    .collect(Collectors.toList());
            points.add(point);
        }

        List<List<Integer>> sortedPoints = points.stream()
                .sorted(Comparator.comparingInt((List<Integer> e) -> e.get(1))
                        .thenComparingInt((List<Integer> e) -> e.get(0)))
                .collect(Collectors.toList());

        for(List<Integer> point : sortedPoints){
            w.write(point.get(0) + " " + point.get(1));
            w.newLine();
        }
        w.flush();

    }
}