Clarification regarding " " & "" - Help

Question

The below code produces
$ java t103
Hello World!
HelloWorld!
is there any logical or any difference in using the two ways of declaring c and cc, because in one of the program that I was writing i was figuring out the problem for a long time and this was issue. I figure out the problem and solved it, but was not sure the actual reason for such a behavior by java. Could somebody help me please.
class t103
     public static void main(String[] args)
          String c = " ";
          String cc = "";
          System.out.println("Hello" + c + "World!");
          System.out.println("Hello" + cc  + "World!");
}

Answer 1

I dont know it was kind of strange to me also, I also knew that the cc is length of zero and c is one. But then why did the behavior of the program change by changing this. Meaning when I used c it never worked and when I used cc it worked perfectly fine.
This is the code snippet, When I declared charSequence " " with a space it never got passed through the for loop that I have mentioned and when I changed it to "" it works fine. So it was not clear to me why it worked when I changed it.
String charSequence = "";
          charSequence += theBoard [ r ] [ c ];
                  for( int i = r, j = c;
                 i >= 0 && j >= 0 && i < x && j < y;
                 i += z, j += a )
/code]