Noob stuck on a problem in java...

Question

Hi, I need to do a program where the user needs to imput a number of lines between 1 and 8 and then the program will make a pyramid of some kind out of a number that is 2^x (1-2-4-8-16 etc). I can calculate and have the numbers but I have no freaking idea how to put them like in the following exemple in the image.
ex : http://img.photobucket.com/albums/v192/Masterzeus/sdfsdfsdf-1.jpg
Number of lines = 4. There's also supposed to be 4 space between each column.
I have to do it with "for" loops. Anyone have any idea? Me and my friend have been searching for hours now.
Thanks.

Answer 1

public class example
     public static void main(String[] args)
          int[] joe = {1,2,4,8};
          for(int a=1; 4>=a; a++)
               for(int b=4; a<b; b--)
                    System.out.print(" ");
               for(int c=0; c<a; c++)
                    System.out.print(joe[c]);
               for(int d=a-2; d>0; d--)
                    System.out.print(joe[d]);
               if(a>1)
                    System.out.print("1");
               System.out.println("");
}