How to find out which line separator BufferedReader#readLine() used to split the line?

Question

I am reading a file via the BufferedReader

String filename = ...
br = new BufferedReader( new FileInputStream(filename));
while (true) {
   String s = br.re         


        

Answer 1

BufferedReader.readLine() does not provide any means of determining what the line break was. If you need to know, you'll need to read characters in yourself and find line breaks yourself.

You may be interested in the internal LineBuffer class from Guava (as well as the public LineReader class it's used in). LineBuffer provides a callback method void handleLine(String line, String end) where end is the line break characters. You could probably base something to do what you want on that. An API might look something like public Line readLine() where Line is an object that contains both the line text and the line end.