By Alvin Alexander. Last updated: February 3, 2021
If you need some source code for a Java FileFilter for image files, this code can get you started:
import java.io.FileFilter; class ImageFileFilter implements FileFilter { private final String[] okFileExtensions = new String[] { "jpg", "jpeg", "png", "gif" }; public boolean accept(File file) { for (String extension : okFileExtensions) { if (file.getName().toLowerCase().endsWith(extension)) { return true; } } return false; } }
The important part of that code is that my ImageFileFilter
extends FileFilter
, and then I implement an accept
method as shown, which returns true
if I think the file is an image file, and false
otherwise.
You can use that file filter with the Java File
class like this:
File dir = new File(canonDirectoryName); File[] filesInDir = dir.listFiles(new ImageFileFilter()); if (filesInDir.length == 0) return; // your custom code here ...
As mentioned, if you need some code for a Java FileFilter
class that works with image files, I hope this is helpful.