Sort First K elements of Array in Java

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

public class Test {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int k = sc.nextInt();
        sc.close();

        int[] a = new int[] {9, 1, 7, 6, 5, 6, 8, 9};

        if (k > a.length) {
            System.out.println("Invalid");
            return;
        }

        //sort first k numbers
        Arrays.sort(a, 0, k);
        for (int x : a) {
            System.out.print(x+ " ");
        }

        System.out.println();
    }
}