Groovy write to file (newline)

Question

I created a small function that simply writes text to a file, but I am having issues making it write each piece of information to a new line. Can someone explain why it puts

Answer 1

@Comment for ID:14. It's for me rather easier to write:

out.append it

instead of

out.println it

println did on my machine only write the first file of the ArrayList, with append I get the whole List written into the file.

Kindly anyway for the quick-and-dirty-solution.