Java return number of files on folder

import java.io.File;

public class archu {

  public static void main(String[] args) {

    File folder = new File("c:/Users");
    File[] listOfFiles = folder.listFiles();

    for (int i = 0; i < listOfFiles.length; i++) {
      if (listOfFiles[i].isFile()) {
        System.out.println("File " + listOfFiles[i].getName());
      } else if (listOfFiles[i].isDirectory()) {
        System.out.println("Directory " + listOfFiles[i].getName());
      }
    }
  }

}

import java.io.*;

public class Number {
        public static void main(String[] args) {
                File f = new File("C:\Users\C:\Users\GULSHAN\Desktop\sarjen");
                int count = 0;
                for (File file : f.listFiles()) {
                        if (file.isFile()) {
                                count++;
                        }
                }
                System.out.println("Number of files: " + count);
        }
   }