How to use file filter to list files

FileFilterImplementation.java

   public File[] getListOfDirectories(File folder){
        FileFilter directoryFileFilter = new FileFilter(){
            @Override
            public boolean accept(File pathname) {
                for(File file: pathname.listFiles()){
                    if(file.isDirectory() && file.getName().contains("Collection")){
                        return true;
                    }
                }

                return false;
            }
        };
        File[] reportFolderDirectories = folder.listFiles(directoryFileFilter);
        return reportFolderDirectories;
    }