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Groups > comp.lang.java.programmer > #9864

Re: A strange behaviour of a File property

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On 11/11/2011 11:25 AM, Andreas Leitgeb wrote:
> alelvb@inwind.it<alelvb@inwind.it>  wrote:
>> public class Main {
>>     public static void main(String[] args){
>>        File f = new File(".");        // try to change the path
>
> ...
>
>>        for(int i=0; i<content.length; i++){
>>            file_array[i] = new File("." + "\\" + content[i]);
>
> First of all, did you change the path also here?
>     or better: define a variable and use it in both spots.
>
> Second, hardcoding "\\" is the worst approach at assembling a
>    file name from components.  See the docu for File class for
>    a static field that contains the appropriate separator char
>    for the current platform.  For test code, "/" is often good
>    enough (even on Windows).

     Even better is to forgo the silly string-bashing and let File
figure it out:

	File parentDir = ...;
	File childFile = new File(parentDir, "child");

IMHO, Java errs in exposing any "path separator" at all, because
it just encourages string-bashing.  Note that in some file systems
there is no such thing as a "path separator;" on one such I had
files with names like

	SYS$DISK:[USERS.ERIC.PROJECT]README.TXT;22

... and even this example doesn't show the full glory(?) of the syntax,
which could also supply host names, user names, and passwords -- all
as part of what a File *ought* to be able to manage.

     (In the O.P.'s specific case, using listFiles() instead of list()
would simplify things a good deal.)

-- 
Eric Sosman
esosman@ieee-dot-org.invalid

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A strange behaviour of a File property alelvb@inwind.it - 2011-11-11 05:45 -0800
  Re: A strange behaviour of a File property Lew <lewbloch@gmail.com> - 2011-11-11 07:34 -0800
    Re: A strange behaviour of a File property alelvb@inwind.it - 2011-11-11 09:28 -0800
      Re: A strange behaviour of a File property Lew <lewbloch@gmail.com> - 2011-11-11 14:17 -0800
        Re: A strange behaviour of a File property alelvb@inwind.it (Alexo) - 2011-11-12 15:04 +0100
          Re: A strange behaviour of a File property Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-12 09:15 -0500
            Re: A strange behaviour of a File property alelvb@inwind.it (Alexo) - 2011-11-12 16:17 +0100
              Re: A strange behaviour of a File property Zlatko Đurić <zladuric@gmail.com> - 2011-11-12 16:09 +0100
              Re: A strange behaviour of a File property Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-12 10:13 -0500
  Re: A strange behaviour of a File property Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-11-11 16:25 +0000
    Re: A strange behaviour of a File property alelvb@inwind.it - 2011-11-11 09:42 -0800
      Re: A strange behaviour of a File property Arne Vajhøj <arne@vajhoej.dk> - 2011-11-11 13:24 -0500
    Re: A strange behaviour of a File property Lew <lewbloch@gmail.com> - 2011-11-11 14:13 -0800
    Re: A strange behaviour of a File property Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-11 20:38 -0500
      Re: A strange behaviour of a File property Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-11-12 03:21 +0000
        Re: A strange behaviour of a File property Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-12 08:26 -0500
          Re: A strange behaviour of a File property Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-11-12 22:09 +0000
            Re: A strange behaviour of a File property Arne Vajhøj <arne@vajhoej.dk> - 2011-11-12 17:40 -0500
              Re: A strange behaviour of a File property Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-11-13 01:28 +0000
                Re: A strange behaviour of a File property Arne Vajhøj <arne@vajhoej.dk> - 2011-11-12 20:42 -0500
                Re: A strange behaviour of a File property Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-11-13 12:15 +0000
                Re: A strange behaviour of a File property Martin Gregorie <martin@address-in-sig.invalid> - 2011-11-13 12:42 +0000
                Re: A strange behaviour of a File property Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-11-13 13:06 +0000
        Re: A strange behaviour of a File property Arne Vajhøj <arne@vajhoej.dk> - 2011-11-12 17:25 -0500
          Re: A strange behaviour of a File property Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-11-13 01:15 +0000
            Re: A strange behaviour of a File property Arne Vajhøj <arne@vajhoej.dk> - 2011-11-12 20:40 -0500
              Re: A strange behaviour of a File property Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-11-13 12:42 +0000
            Re: A strange behaviour of a File property Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-12 21:11 -0500
              Re: A strange behaviour of a File property Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-11-13 20:50 +0000
                Re: A strange behaviour of a File property Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-14 08:18 -0500
                Re: A strange behaviour of a File property Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-11-14 17:38 +0000
                Re: A strange behaviour of a File property Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-14 21:51 -0500
                Re: A strange behaviour of a File property Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-11-15 14:17 +0000
                Re: A strange behaviour of a File property Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-15 22:20 -0500
                Re: A strange behaviour of a File property Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-11-16 12:14 +0000
                Re: A strange behaviour of a File property Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-16 08:10 -0500
      Re: A strange behaviour of a File property Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-11-11 19:46 -0800
      Re: A strange behaviour of a File property Owen Jacobson <angrybaldguy@gmail.com> - 2011-11-14 00:24 -0500
        Re: A strange behaviour of a File property Lew <lewbloch@gmail.com> - 2011-11-13 22:00 -0800
  Re: A strange behaviour of a File property Roedy Green <see_website@mindprod.com.invalid> - 2011-11-12 05:00 -0800
    Re: A strange behaviour of a File property Arne Vajhøj <arne@vajhoej.dk> - 2011-11-12 09:15 -0500

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