Sort First K elements of Collection in Java

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

public class Test {
    public static void main(String[] args) {
        ArrayList<Integer> arr = new ArrayList<>(Arrays.asList(9, 1, 7, 0, 1, 5, 4, 6));

        Scanner sc = new Scanner(System.in);
        int k = sc.nextInt();
        sc.close();

        if (k > arr.size()) {
            System.out.println("Invalid");
            return;
        }

        //sort first k elements
        Collections.sort(arr.subList(0, k));

        for (Integer x : arr) {
            System.out.print(x + " ");
        }
        System.out.println();
    }
}