求出目录的大小

import java.io.File;

import java.util.Scanner;



public class DirectorySize {

    public static void main(String[] args){

        System.out.print("Enter a directory or a file: ");

        Scanner input = new Scanner(System.in);

        String directory = input.nextLine();

        

        System.out.println(getSize(new File(directory)) + " bytes");    

    }

    

    public static long getSize(File file){

        long size = 0;

        

        if(file.isDirectory())

        {

            File[] files = file.listFiles(); // All files and Subdirectories

            for(int i = 0; i < files.length; i++)

            {

                size += getSize(files[i]);

            }

        }

        else

        {

            size += file.length();    

        }

        return size;

    }

}