PROGRAMMERES Level 1 정렬 K번째수 JAVA

import java.util.*;

class Solution {
    public int[] solution(int[] array, int[][] commands) {
        int[] answer = new int[commands.length];
        
        for(int i=0; i<commands.length; i++){
            ArrayList<Integer> arr = new ArrayList<>();
            for(int j=commands[i][0]-1; j<commands[i][1]; j++){
                arr.add(array[j]);
            }
            Collections.sort(arr);
            answer[i] = arr.get(commands[i][2]-1);
        }
        
        
        return answer;
    }
}

Collections.sort(배열명) -> 오름차순 정렬