تحديات برمجيةالتحدي الثالث - حل التمرين الثاني 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 the number of lines: ");
            n = input.nextInt();
        }
        while( n<=0 || n%2==0 );
        
        for (int i=1; i<=n; i++)
        {
            if(i<=n/2)
            {
                for (int k=1; k<(n/2)-i+2; k++)
                {
                    System.out.print(" ");
                }

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

}

Enter the number of lines: 9
    *
   * *
  *   *
 *     *
*       *
 *     *
  *   *
   * *
    *