java get all sub-folder in a directory

/**
 * @author lautturi.com 
 * Java example: java get all directories in a directory
 */

import java.util.*;
import java.io.File;
import java.io.FileFilter;

public class Lautturi {

	public static void main(String[] args) {
		
		File[] directories = new File("F:/testfolder").listFiles(new FileFilter() {
		    @Override
		    public boolean accept(File file) {
		        return file.isDirectory();
		    }
		});
		for(File file : directories) {
			System.out.println(file.getPath());
		}
	}
}