Star_Frame

import java.util.Scanner;

public class pattern {
    public static void main(String[] args) {

Scanner keyboard = new Scanner(System.in);
        System.out.print("Enter size: ");
        int s = keyboard.nextInt();

        for (int i = 1; i <= s; i++) {
            for (int j = 1; j <= s; j++) {
                if ((i == 1 || i == s) || (j == 1 || j == s)){
                    System.out.print("*");
                }else {
                    System.out.print(" ");
                }

            }
            System.out.println();
        }
    }

}