Re: Executable JAR files and writing to a text file.

From:

=?windows-1252?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>

Newsgroups:

comp.lang.java.programmer

Date:

Sat, 14 Feb 2015 22:31:30 -0500

Message-ID:

<54e01313$0$287$14726298@news.sunsite.dk>

On 2/12/2015 12:40 PM, Doug Mika wrote:

I have an application in which it writes to a text file at a specific
directory location. I run the program and it runs fine! Now I create
an executable JAR file. Should the jar file work fine if the program
needs to write to a text file in ../resources/HighScore.txt?

One potential problem is that ../resources/HighScore.txt is
not relative to the location of the jar file but relative to
the default dir of the process running the program.

For illustration try run this program with a default dir
that is different from code location dir.

import java.io.File;

public class WhatDir {
    public static void main(String[] args) throws Exception {
        String relfnm = "../subdir/filename.txt";
        String p1 = new File(relfnm).getAbsolutePath();
        System.out.println(p1);
        String p2 = new File(relfnm).getCanonicalPath();
        System.out.println(p2);
        String p3 = new
File(WhatDir.class.getProtectionDomain().getCodeSource().getLocation().getPath()
+ relfnm).getAbsolutePath();
        System.out.println(p3);
        String p4 = new
File(WhatDir.class.getProtectionDomain().getCodeSource().getLocation().getPath()
+ relfnm).getCanonicalPath();
        System.out.println(p4);
    }
}

Arne