Using Guava Predicates you would do something along the lines of
import java.io.File;
import java.util.Collection;
import java.util.List;
import javax.annotation.Nullable;
import com.google.common.base.Predicate;
import com.google.common.collect.Collections2;
import com.google.common.io.Files;
public class FileFiltering {
public static void main(String[] args) {
List<File> files = getFiles();
Collection<File> audioFiles = Collections2.filter(files,
new AudioPredicate());
Collection<File> videoFiles = Collections2.filter(files,
new VideoPredicate());
}
private static List<File> getFiles() {
// TODO Auto-generated method stub
return null;
}
}
class AudioPredicate implements Predicate<File> {
@Override
public boolean apply(@Nullable File file) {
return Files.getFileExtension(file.getName()).equalsIgnoreCase("mp3");
}
}
class VideoPredicate implements Predicate<File> {
@Override
public boolean apply(@Nullable File file) {
return Files.getFileExtension(file.getName()).equalsIgnoreCase("mkv");
}
}
In the apply method(s) you will need to write code that will return true for the kind of file you want.