Square Of Stars

import java.util.Scanner;

public class SquareOfStars1 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = Integer.parseInt(scan.nextLine());
        String stars = new String(new char[n]).replace("\0", "*");
        System.out.println(stars);
        for (int i=0; i<n - 2; i++) {
            System.out.printf("*");
            System.out.printf(new String(new char[n - 2]).replace("\0", " "));
            System.out.println("*");
        }
        System.out.println(stars);
    }
}