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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);

ListHiddenAndVisibleFilesTest.java

package test;

import java.io.File;
import java.io.FileFilter;
import java.io.IOException;

import org.apache.commons.io.filefilter.HiddenFileFilter;

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.

The output from executing ListHiddenAndVisibleFilesTest is shown here.

Results

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