java.io.FileFilter - a pragmatic and powerful way to select files

Today I discovered the FileFilter interface. A little bit late maybe - but better late than never!

File[] libs = libDir.listFiles(new FileFilter() {
  public boolean accept(File pathname) {
     return !pathname.isDirectory() && pathname.getName().endsWith(".jar");
  }
});

This example is a very simple one but since this is a method instead of a pattern like *.jar there are no limitations how the filtering is done. Regular expressions, web services, databases, relations of file names, ... I do like that approach since even it is powerful it's still simple and easy to use. If all API's were designed like this software development would be simpler and faster.