Using File.listFiles with FileNameExtensionFilter
The FileNameExtensionFilter class is intended for Swing to be used in a JFileChooser.
Try using a FilenameFilter instead. For example:
File dir = new File("/users/blah/dirname");
File[] files = dir.listFiles(new FilenameFilter() {
public boolean accept(File dir, String name) {
return name.toLowerCase().endsWith(".txt");
}
});
One-liner in java 8 syntax:
pdfTestDir.listFiles((dir, name) -> name.toLowerCase().endsWith(".txt"));