Java parse contents of a string into lines, auto-detecting line type

Question

I have a string of around a hundred lines, it is unknown whether the lines will be "\r\n" or "\n".

I want to parse the string once, processing each line.

This question almost answers mine, but there's no mention of how to deal with unknown new line delimiting characters.

I was thinking of using one of the above methods, choosing "\n" as the delimiter and then stripping any "\r" characters on a line-by-line basis.

While performance really isn't an issue, I'd like to know if there is a cleaner way of doing this. I have not been able to find any methods that automatically handle line delimiter types.

Attempt #1, as per suggestion from @TritonMan:

Scanner scanner = new Scanner(myString);
String line = scanner.nextLine();
// line contains whole contents of string, not just the first line

If it matters, I am running this on Android. The string comes from a PLS file (playlist) which doesn't seem to be well defined anywhere, so I do not know what type of line delimiters it uses.

As a fallback, I will use the code from this question, but it's now bugging me how to do it without regex or String.split() in case I deal with streams:

String lines[] = String.split("\\r?\\n");

Does the second answer not work for you? It should. The one that uses Scanner — Rocky Pulley
– Rocky Pulley, Commented Jul 29, 2014 at 16:02
Scanner and BufferedReader don't care about the type of line ending. They will match both of them. See also this answer — Guillaume Polet
– Guillaume Polet, Commented Jul 30, 2014 at 12:47
Thanks - turns out (as you probably knew) I did not notice that other code stripped out the lines before passing it to mine. — Jayy
– Jayy, Commented Jul 30, 2014 at 15:04

gkrls · Accepted Answer · 2014-07-29 17:10:08Z

1

Hint : JDK is open source! You can look how the Scanner class is implemented.

In short:

Scanner in = new Scanner(source);

while(in.hasNextLine())
    String line = in.nextLine();

    //Do something!

will store a line on both "\r\n" and "\n" cases.

answered Jul 29, 2014 at 17:10

gkrls

2,6642 gold badges17 silver badges30 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Java parse contents of a string into lines, auto-detecting line type

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related