Something like a box

import java.util.Scanner;
public class Main
{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter your number here: ");
        int n = Integer.parseInt(sc.nextLine());
        //top row
        String betweenSpaces = generateFrom(" ",(n+1)/2);
        int x =2;

        String firstLast = generateFrom("%",n*2-2);
        System.out.println("%" + firstLast + "%");
        //under top
        int uTopLoop = 0;
        if(n%2 == 0){
            uTopLoop = (n/2)-1;
        }
        else{
            uTopLoop = n/2;
        }



        String space = generateFrom(" ",n*2-2);
        for(int m = 0;m<uTopLoop;m++){
            System.out.println("%" + space + "%");
        }
        //middle

        System.out.println("%" + betweenSpaces + "**" + betweenSpaces + "%");
        //under middle
        for(int s = 0;s<uTopLoop;s++){
            System.out.println("%" + space + "%");
        }
        //bottom
        System.out.println("%" + firstLast + "%");
    }

    static String generateFrom(String symbol,int number){
        String text = "";
        for(int i=0;i<number;i++){
            text = text+symbol;
        }
        return text;
    }
}