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From: Lew <noone@lewscanon.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: Shortest way to read all lines (one by one) from a text file?
Date: Fri, 11 Feb 2011 07:51:27 -0500
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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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