Problem A.3 Programming Language Java Write a program that prompts the user to e

Question

Problem A.3 Programming Language Java

Write a program that prompts the user to enter a directory and displays the number of files in that directory. Your result should also include all the files from each subdirectory. Do not count folders and subfolders as files. Use an appropriate try and catch statement to handle the case when the given path does not exist. Hint: Use recursion for subdirectories (see chapter 18)

Example output:

Analysis (2 points):

Describe the problem including input and output in your own words.

Design (2 points):

Describe the major steps for solving the problem. How do you use recursion to solve this problem?

Explanation / Answer

//java program that prompts user to enter a valid directory
//to display the files in the total files in the directories and
//subdirectories .
//ListFiles.java
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Scanner;
public class ListFiles
{
   public static void main(String[] args) throws FileNotFoundException
   {
      
       Scanner reader=new Scanner(System.in);
       String directory;
       int totalFiles=0;
       File currentDir =null;

       //Prompts user to enter a valid directory name
       do
       {
           //read name of the directory
           System.out.println("Enter directory ");
           directory=reader.nextLine();
           // current directory
           currentDir = new File(directory);

           if(!currentDir.exists())
           {
               System.out.println("Invalid Directory:");
               System.out.println("Enter a valid directory");
           }
          
       }while(!currentDir.exists());

       //call the metod
       totalFiles=printFiles(currentDir);
       System.out.println("Total Number of Files : "+totalFiles);
   }

  
   //The method printFiles that accepts an directory name
   //and prints the all files in the directories and subdirectories
   //recursively.
   public static int printFiles(File dir)
   {
       int count=0;
       try
       {
           File[] files = dir.listFiles();
           for (File file : files)
           {
               //calls the subdirectory for files
               if (file.isDirectory())
               {
                   //count the files in the current directory
                   count=count+printFiles(file);
               }
               else
               {
                  
                   System.out.println(" File:" + file.getCanonicalPath());
                  
                   //increment the count if the file is not directory.
                   count++;
               }
           }

       }
       //catch the IO exception.
       catch (IOException e)
       {
           System.out.println(e.getMessage());
       }

       //return total files in the directory.
       return count;

   }

}

-----------------------------------------------------------------------------------------------

Sample output:

Enter directory
E:kids_imagesFiles
Invalid Directory:
Enter a valid directory
Enter directory
E:kids_images
File:E:kids_images
937475_814053508636066_35974530819673309

69_n.jpg
   File:E:kids_images¡95xcitefun-kidspartywear7.jpg
  

File:E:kids_imagesdeep-wine-kids-traditional-saree-800x1100.jpg
   File:E:kids_imagesDesigner-Indian-Kids-Wear.jpg
  

File:E:kids_imagesdiscuss-divorce-with-children-houston-family-law-001

.jpg
   File:E:kids_imagesimage13569531.jpg
   File:E:kids_imagesimages.jpeg
   File:E:kids_imagesimages5646.jpeg
   File:E:kids_imagesindian_kids_fashion_15.jpg
   File:E:kids_imagesindian_kids_fashion_19.jpg
   File:E:kids_imagesindian_kids_fashion_26.jpg
   File:E:kids_imagesindian_kids_fashion_31.jpg
   File:E:kids_imagesjiya.jpg
   File:E:kids_imageskids vaddanam and kasu haram.jpg
   File:E:kids_imageskids_ind_2.29002106_std.jpg
  

File:E:kids_imagesLatest-Beautiful-Kids-Indian-Saree-Style-2012.jpg
   File:E:kids_imagesLight-Aqua-Blue-Net-Kids-Saree.jpg
  

File:E:kids_imagesorang-color-Indian-wedding-wear-dress-2014.jpg
   File:E:kids_imagesThumbs.db
  

File:E:kids_imagesTraditional-fashion-for-kids-indian-festival-ganesh-cha

turthi.jpg
   File:E:kids_imagesu08twetiuow.jpg
   File:E:kids_imagesUSJ72_large.jpg
Total Number of Files : 22

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