Diamond maker

import java.util.Scanner;

public class Diamond
{
    public static void main(String[] args)
    {
    int numStars;
    Scanner input = new Scanner(System.in);
    numStars = input.nextInt(); // obtain user input
    int middle = numStars / 2 + 1;
    int columnWidth = numStars / 2;
    int numSpaces = columnWidth;
    int rowCntr;
    int colCntr;
    boolean leftRight = true;// true = left
    boolean topBottom = true;// true = top
    for (rowCntr = 1; rowCntr <= numStars; rowCntr++)
    {
        if (rowCntr < middle)
        {
        numSpaces = columnWidth - rowCntr;
        }
        else if (rowCntr == middle)
        {
        numSpaces = 0;
        topBottom = false;
        }
        else
        {
        numSpaces++;
        }
        for (colCntr = 1; colCntr <= numStars; colCntr++)
        {
        if (topBottom)
        {
            if (colCntr <= numSpaces + 1)
            {
            System.out.print("a");
            }
            else if (colCntr == middle)
            {
            System.out.print("b");
            leftRight = false;
            }

            else if (!leftRight && (numStars - colCntr) <= numSpaces)
            {
            System.out.print("c");
            }
            else
            {
            System.out.print("d");
            }

        }
        else if (rowCntr == middle)
        {
            System.out.print("e");
        }
        else if (!topBottom)
        {
            if (colCntr <= numSpaces)
            {
            System.out.print("f");
            }
            else if (colCntr == middle)
            {
            System.out.print("g");
            leftRight = false;
            }

            else if (!leftRight && (numStars - colCntr) <= numSpaces)
            {
            System.out.print("h");
            }
            else
            {
            System.out.print("i");
            }

        }
        // else if(!topBottom)
        // {

        // }
        }// end colCntr
        System.out.println();
        leftRight = true;
    }// end rowCntr
    }

}