How do I get the hidden or visible files in a directory using a filter?
Author: Deron Eriksson
Description: This Java tutorial describes how to display the hidden or visible files in a directory using a filter from Commons IO.
Tutorial created using: Windows XP || JDK 1.5.0_09 || Eclipse Web Tools Platform 2.0 (Eclipse 3.3.0)

The HiddenFileFilter.HIDDEN and HiddenFileFilter.VISIBLE singleton instances in the ApacheSW Commons IOS library are filters that can be used to filter hidden and visible files (and directories), respectively. The ListHiddenAndVisibleFilesTest demonstrates this. It gets a listing of all the hidden files and directories in my project's root directory via

directory.listFiles((FileFilter) HiddenFileFilter.HIDDEN);

It then gets a listing of all visible files and directories in the same directory via

directory.listFiles((FileFilter) HiddenFileFilter.VISIBLE);

package test;



public class ListHiddenAndVisibleFilesTest {

	public static void main(String[] args) throws IOException {
		File directory = new File(".");

		System.out.println("Hidden Files:");
		File[] hiddenFiles = directory.listFiles((FileFilter) HiddenFileFilter.HIDDEN);
		for (File hiddenFile : hiddenFiles) {
			System.out.println("hidden file: " + hiddenFile.getCanonicalPath());

		System.out.println("\nVisible Files:");
		File[] visibleFiles = directory.listFiles((FileFilter) HiddenFileFilter.VISIBLE);
		for (File visibleFile : visibleFiles) {
			System.out.println("visible file: " + visibleFile.getCanonicalPath());

My project's directory contents are shown below. All files and directories are visible except hidden1.txt and hiddent2.txt.

project contents

The output from executing ListHiddenAndVisibleFilesTest is shown here.


Hidden Files:
hidden file: C:\projects\workspace\testing\hidden1.txt
hidden file: C:\projects\workspace\testing\hidden2.txt

Visible Files:
visible file: C:\projects\workspace\testing\.classpath
visible file: C:\projects\workspace\testing\.project
visible file: C:\projects\workspace\testing\bin
visible file: C:\projects\workspace\testing\docs
visible file: C:\projects\workspace\testing\lib
visible file: C:\projects\workspace\testing\src
visible file: C:\projects\workspace\testing\stuff
visible file: C:\projects\workspace\testing\visible1.txt
visible file: C:\projects\workspace\testing\visible2.txt

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