hexagon.java

class hexagon
{
    static void printHexagon(int n)
    {
        int l = 2 * n - 1;
     
        /**** Print upper part *****/
        for (int i = 0; i < n; i++)
        {
            int elem = i + n;
     
            // loop for printing the
            
            for (int k = 0; k < elem; k++)
            {
                
                if ((k == n + i - 1) ||
                    (k == n - i - 1))
                    System.out.print("*");
                else
                    System.out.print(" ");
            }
            System.out.print("\n");
        }
     
        /**** Print middle part *****/
        
        for (int m = 0; m < n - 2; m++)
        {
            for (int j = 0; j < l; j++)
            {
                if (j == 0 || j == l - 1)
                    System.out.print("*");
                else
                    System.out.print(" ");
            }
            System.out.print("\n");
        }
     
        /**** Print Lower part *****/
        int r = n - 1;
        for (int h = r; h >= 0; h--)
        {
            int elem = h + n;
            for (int k = 0; k < elem; k++)
            {
                if ((k == n + h - 1) ||
                    (k == n - h - 1))
                    System.out.print("*");
                else
                    System.out.print(" ");
            }
            System.out.print("\n");
        }
    }
     
    
    public static void main (String[] args)
    {
        // length of a side
        // n >= 2
        int n = 3;
        printHexagon(n);
    }
}