تحديات برمجيةالتحدي السادس - حل التمرين الأول بلغة جافا

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);
        int n;

        do {
            System.out.print("Enter an odd number as the number of lines: ");
            n = input.nextInt();
        }
        while (n <= 0 || n%2 == 0);
        
        for (int i = 1; i <= n; i++)
        {
            for (int j = 1; j <= n; j++)
            {
                if ((i <= n / 2 && j > i && j <= n - i) || (i > n / 2 && j < i && j > n - i + 1))
                {
                    System.out.print(" ");
                }
                else
                {
                    System.out.print("*");
                }
            }
            System.out.println();
        }

    }

}

Enter an odd number as the number of lines: 9
*       *
**     **
***   ***
**** ****
*********
**** ****
***   ***
**     **
*       *