Java Stream How to - Sort directory and file

Question

We would like to know how to sort directory and file.

Answer

import java.io.File;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.stream.Stream;
/*from   w ww . j  a  v a2  s . c  o m*/

public class Main {

  public static void main(String[] args) {
    final String dir = "E:\\Java_Dev\\";
    final File file = Paths.get(dir).toFile();
    File[] files = file.listFiles();
    Arrays.sort(files, (f1, f2) -> {
      if(f1.isDirectory() != f2.isDirectory()) {
        if(f1.isDirectory()) {
          return -1;
        } else {
          return 1;
        }
      }
      else {
        return f1.getName().toLowerCase().compareTo(f2.getName().toLowerCase());
      }
    });
    Stream.of(files)
        .forEach(System.out::println);
  }
}