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Re: Shortest way to read all lines (one by one) from a text file?

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  Re: Shortest way to read all lines (one by one) from a text file? Lew <noone@lewscanon.com> - 2011-02-11 07:51 -0500
    Re: Shortest way to read all lines (one by one) from a text file? Real Gagnon <realgag+usenet@geocities.com> - 2011-02-11 22:34 +0000

#25827 — Re: Shortest way to read all lines (one by one) from a text file?

Robin Wenger wrote:
>> Ok, I know in general a way to read text lines ony-by-one from a file into a
>> string variable.
>> But I miss somehow a short one-liner like:
>>
>> foreach(String currentline : file("D:\test\myfile.txt")) {
>> ....
>> }
>>
>> Is there something like this in Java?
>> What would be the shortest way otherwise?

Peter Duniho wrote:
> Well, a BufferedReader is a good way to read a line at a time. It would be
> trivial to wrap that in an Iterable implementation so that you could use the
> syntax above.

The Scanner class also provides compact ways to do this, although it's field 
oriented rather than line oriented.  But I have to ask, for what purpose do 
you want a one-liner?  Is this just intellectual curiosity?

The normal loop, ignoring exceptions for a heartbeat, is like:

  BufferedReader reader = ...;
  for ( String line; (line = reader.readLine()) != null; )
  {
//    do something with line
  }

How much more compact do you want?

-- 
Lew
Ceci n'est pas une fenêtre.
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|===========|

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#25850

Lew <noone@lewscanon.com> wrote in news:ij3bb4$eal$1@news.albasani.net:

> The Scanner class also provides compact ways to do this, although it's
> field oriented rather than line oriented. 

True but it's possible to use the EOF as the delimiter

   Scanner scanner = 
      new Scanner(new File("c:/temp/text.txt")).useDelimiter("\\Z");
    String contents = scanner.next();

BYe.


-- 
Real Gagnon  from  Quebec, Canada
* Java, Javascript, VBScript or PowerBuilder snippets
* http://rgagnon.com/howto.html
* http://rgagnon.com/bigindex.html

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