Counting number of files in a directory

[christiangirl]

Hello,
How would I count the number of files in a directory? Thanks!

[masijade]

listFiles() and use the length of the returned array?

See the API docs for File.

[christiangirl]

How would I do that?

[masijade]

See the API docs for File.

http://java.sun.com/javase/6/docs/api/index.html

[christiangirl]

I did look it up, even before the first time you told me too. But I am still having trouble figuring it out. How do I used the array listFiles returns?

[masijade]

How do you normally use an array?

String[] files = file.listFiles();
int numFiles = files.length;

[christiangirl]

oooh lol now i feel dumb. Thanks!

[Ezzaral]

Also note that directories will also be included and can be discerned with file.isDirectory(). If you need to include file counts from subdirectories, you'll need to do the recursion yourself.

[meglizhem]

Also note that directories will also be included and can be discerned with file.isDirectory(). If you need to include file counts from subdirectories, you'll need to do the recursion yourself.

I am writing a program that should return the number of files in a user specified directory. I have a sample program that returns the size of a directory. How would I go about changing it to return the number of files? (You referred to it in this post.)

/*
 * CSCI 2410
 * Meghan E. Hembree
 * Friday, September 3, 2010, 11:00:00am
 *
 * Description: (Number of files in a directory)  Write a program that
 * prompts the user to enter a directory and displays the number of the
 * files in the directory.
 *
 */
package exercise20_29;

import java.io.File;
import java.util.Scanner;

public class Exercise20_29 {

    public static void main(String[] args) {
        //Prompt the user to enter a directory or a file
        System.out.print("Enter a directory or a file: ");
        Scanner input = new Scanner(System.in);
        String file = input.nextLine();

        //Display the size
        System.out.println(getSize(new File(file)) + " files");
    }

    public static long getSize(File file){
        //Store the total size of all files
        long size = 0;

        if(file.isDirectory()){
            //All files and subdirectories
            File[] files = file.listFiles();
            for (int i = 0; i < files.length; i++){
                //Recursive call
                size += getSize(files[i]);
            }
        }
        //Base case
        else{
            size += file.length();
        }

        return size;
    }

}

[Ezzaral]

You can count them recursively the same way you determined the total size. I assume you don't want to include directories in that count.