[java] 백준 좌표정렬하기2

package main;
import java.io.*;
import java.util.*;

public class Main {
	
	public static void main(String[] args) throws Exception{
	
		StringBuffer sb = new StringBuffer();
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st;
			
		int n = Integer.parseInt(br.readLine());
		int[][] arr = new int[n][2];
		
		for(int i=0; i<n; i++) {
			st =  new StringTokenizer(br.readLine());
			arr[i][0] = Integer.parseInt(st.nextToken());
			arr[i][1] = Integer.parseInt(st.nextToken());
		}
		
		//람다식
		Arrays.sort(arr, (a1, a2)-> {
			if(a1[1]==a2[1]) {
				return a1[0]-a2[0];}
			else
				{return a1[1]-a2[1];}
			});
		
		for(int i=0; i<n; i++) {
			sb.append(arr[i][0]+" "+arr[i][1]).append("\n");
		}
		System.out.println(sb);
		
	}
	
}

람다식 이용