Membuat Segitiga dengan Java Console

Cara membuat segitiga dengan java Console

import java.util.Scanner;

public class bintang
{
	public static void main(String[]args)
	{
		int col, row, a,i ;

		Scanner baca = new Scanner(System.in);

		System.out.print("masukan besar segitiga: ");
		a = baca.nextInt();

		System.out.println();

		for(row = 0 ; row < a; row++)
		{
			for(col = 0; col <=row; col++)
			{
				System.out.print("*");
			}

				System.out.println();
		}

		for(i=0; i<=a; i++)
		 	{
		    for( col=a; col>i; col--)
				{
		      System.out.print(" ");
		  	}

				for( row=1; row<=i; row++)
				{
						System.out.print("*");
		  	}

				System.out.println();
		 	}

		for(i=0; i<=a; i++)
			{
				for( col=a-i; col>0; col--)
				{
					System.out.print(" ");
				}

			for( row=1; row