How to print a character return in a txt file?

i tried this line of code
" outFile.print(lines.get(k) + "\n"); "
where "lines" is an arraylist that stores only strings
everything works fine, except the "\n" doesn't really give me a character return, ie. i want the file to start on a new line after printing lines.get(k). but it doesn't.
what should i put in the place of \n?
thanks a lot!

yea, i load the saved file into notepad, and all i see is something like || (2 little bars) instead of a return, and the next word continues on the same line instead of going to the next line
...... _-- ||||||

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Character     Line Number     Character Number
[!]          [1]          [5]
[@]          [2]          [4]
[%]          [5]          [4]
[^]          [6]          [4]
[_]          [11]          [5]
[+]          [12]          [5]
[=]          [14]          [5]
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[`]          [16]          [5]
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[:]          [18]          [5]
[']          [19]          [5]
["]          [20]          [5]
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[ ]          [1]          [18]
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[ ]          [1]          [6530]
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[']          [30]          [2066]
[']          [47]          [2066]
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[']          [77]          [2066]
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