تمرین چاپ مربع + جاوا

Sample 1 :
-------------------------------------------
input :
6
output :
******
*    *
*    *
*    *
*    *
******

import java.util.Scanner;

public class Main {

    public static Scanner sc;


    public static void main(String[] args) {
        sc = new Scanner(System.in);
        int n = sc.nextInt();

        for (int i=1; i <= n; i++)
            System.out.print("*");
        System.out.println("");

        if(n - 2 != 0) {
            for (int i = 1; i <= n-2; i++) {
                System.out.print("*");
                for (int j=1; j <= n-2; j++) {
                    System.out.print(" ");
                }
                System.out.println("*");
            }
        }

        for (int i=1; i <= n; i++)
            System.out.print("*");
        System.out.println("");

    }

}