Pattern Program

/**
 * user inputs a number greater than 2
 */
/**
run:
Enter an even number : 4

          *
       *     *
    *           *
 *                 *
    *           *
       *     *
          *


 */

/*
 * No negative inputs please
 */
/**
 * A quote: there are more than one ways to do it
 */
package javaapplication2;

import java.util.Scanner;

/**
 *
 * @author Umang
 */
public class Main
{
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)
    {

        boolean b = false;

        // to print inner stars
        int n1 = 0;

        int n2 = 0;

        // loop variables
        int j = 0, k = 0;

        Scanner s = new Scanner(System.in);

        System.out.print("Enter an even number : ");

        int n = s.nextInt();

        n1 = n2 = n / 2 + 1;

        
        System.out.print("\n");

        for (j = 0; j <= n +2 ; j++)
        {

            for (k = 0; k < n * 2; k++)
            {

                if (k == n1 || k == n2)
                {

                    System.out.print( " * " );
                }
                else
                {

                    System.out.print("   ");
                }
            }
            if(j-1==n/2)
            {

                b = true;
            }
            if (b == false)
            {

                n1--;
                n2++;
            }
            else
            {
                n1++;

                n2--;
            }
            System.out.print("\n");
        }
    }
}