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    <p>This quote from the <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/io/File.html" rel="noreferrer">Javadoc</a> might be helpful:</p> <blockquote> <p>A pathname, whether abstract or in string form, may be either <em>absolute</em> or <em>relative</em>. An absolute pathname is complete in that no other information is required in order to locate the file that it denotes. A relative pathname, in contrast, must be interpreted in terms of information taken from some other pathname. By default the classes in the <code>java.io</code> package always resolve relative pathnames against the current user directory. This directory is named by the system property <code>user.dir</code>, and is typically the directory in which the Java virtual machine was invoked. </p> </blockquote> <p>I interpret this so that if you create your <code>File</code> object with <code>new File("filename")</code> where <code>filename</code> is a relative path, that path will not be converted into an absolute path even by a call to <code>file.getAbsolutePath()</code>.</p> <p><strong>Update:</strong> now that you posted code, I can think of some ways to improve it:</p> <ul> <li>you could use a <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/io/FilenameFilter.html" rel="noreferrer">FilenameFilter</a> to find the desired files,</li> <li>note that <code>list</code> and <code>listFiles</code> return <code>null</code> for non-directory objects, so we need an extra check for that,</li> <li>you could also use <code>listFiles()</code> again in the inner loop, thus avoiding the need to create new <code>File</code> objects with hand-assembled paths. (Btw note that appending <code>\\</code> manually to the path is not portable; the proper way would be to use <code>File.separator</code>).</li> </ul> <p>The end result is</p> <pre><code>private static void doSomethingToDirectory(File factDir) throws IOException { if (factDir.isDirectory()) { for (File file : factDir.listFiles()) { if (file.isDirectory()) { for (File child : file.listFiles(new MyFilter())) { process(child); } } } } } class MyFilter implements FilenameFilter { public boolean accept(File dir, String name) { return name.equals(TEMP_COMPARE_FILE); } } </code></pre> <p>Note that this code mimics the behaviour of your original piece of code as much as I understood it; most notably, it finds the files with the proper name only in the <em>direct subdirectories</em> of <code>factDir</code>, nonrecursively.</p>
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    1. COw0w Peter I must definitely say this, I think this is one of the best answers I've ever gotten on SO, you MyFilter class suggestion reduced like so much code, just AMAZING. Thank you very much
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