Stars Square Fraame Nested For Loops

Scanner key = new Scanner(System.in);
        System.out.print("Enter number for size of square n = ");
        int n = key.nextInt();
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= n ; j++) {
               if (j == 1 || j == n || i == 1 || i == n ) {
                    System.out.format("*");
                } else {
                   System.out.format(" ");
                }
            }
                System.out.println();
    }
}