get number of files in a directory and its subdirectories

Question

using this code

new File(\"/mnt/sdcard/folder\").listFiles().length

returns a sum of folders and files in a particular directory without ca

Answer 1

Using Java 8 NIO:

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Test {

  public long fileCount(Path dir) { 
    return Files.walk(dir)
                .parallel()
                .filter(p -> !p.toFile().isDirectory())
                .count();
  }

  public void main(String... args) {
    Path dir = Paths.get(args[0]);
    long count = fileCount(dir);

    System.out.println(args[0] + " has " + count + " files");
  }

}