1966. 숫자를 정렬하자

package oSWExpertAcademy;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;

public class D2_1966 {
    public static void main(String[]args) {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        try {
            int testCase = Integer.parseInt(br.readLine());
            for(int tc=1; tc<=testCase; tc++) {
                int nums = Integer.parseInt(br.readLine());
                int[] arr =new int[nums];
                StringTokenizer st = new StringTokenizer(br.readLine());
                for(int i=0; i<nums; i++) {
                    arr[i] = Integer.parseInt(st.nextToken());
                }
                //자바의 Arrays.sort() 를 사용하여 배열 오름차순으로 정렬 
                Arrays.sort(arr);
                System.out.print("#"+tc+" ");
                for(int i=0; i<nums; i++) {
                System.out.print(arr[i]+" ");
                }
                System.out.println();
            }
        } catch (NumberFormatException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}