It's fairly simple, but you need two nested loops.  If you can't figure
it out, please post the code to your attempt.  It's hard to help you
unless we can get some idea of what specifically you don't understand
about this task.

1) Create a StringBuffer (or, if using 1.5, a StringBuilder)
2) In each iteration, add the current value of the iterated variable to  
the buffer, then a space
3) print the value of the buffer in each iteration

Oh, you wanted actual code?

Here you go:

public class Lines{static java.io.PrintStream _=System.out;static int
_int(int i){int j;for(j=1;j<i;_.print(j+++" "));return j;}public static
void main(String[]s){for(int i=1;i<=4;_.println(_int(i++)));}}

Anyone who's "pretty good with loops" should have no problem figuring it
out.

I hope your instructor gives me a good mark.

--
Grant Wagner <gwagner@agricoreunited.com