Listing files in a directory matching a pattern in Java [duplicate]

Question

I'm looking for a way to get a list of files that match a pattern (pref regex) in a given directory.

I've found a tutorial online that uses apache's commons-io package with the following code:

Collection getAllFilesThatMatchFilenameExtension(String directoryName, String extension) {   File directory = new File(directoryName);   return FileUtils.listFiles(directory, new WildcardFileFilter(extension), null); } 

But that just returns a base collection (According to the docs it's a collection of java.io.File). Is there a way to do this that returns a type safe generic collection?

Answer 1

See File#listFiles(FilenameFilter).

File dir = new File("."); File [] files = dir.listFiles(new FilenameFilter() {     @Override     public boolean accept(File dir, String name) {         return name.endsWith(".xml");     } });  for (File xmlfile : files) {     System.out.println(xmlfile); } 

Answer 2

Since Java 8 you can use lambdas and achieve shorter code:

File dir = new File(xmlFilesDirectory); File[] files = dir.listFiles((d, name) -> name.endsWith(".xml"));