import java.io.*;

public class Dir {

/* Command::

dir name where name must be null or the name of a directory and its paths.

Action:

List the file and directory names in this directory.

Note that if the user enters "dir" it is OK and it means the current

directory. In this case as you know a period (e,g .) means the current

directory

Errors:

The user enters:

1. dir name The directory name does not exist.

2. dir name But the name does is not a directory name.

When there is an error println a message and return (not exit).

*/

public Dir(String name){

f(name); //Calling the function f passing the input path and file

}

private static void f(String name){

//creating a new object for the file class

File file = new File(name);

//Checking whether the file exists

if(file.exists()) {

// listOfFiles array is created to store all the files and folders in the specified path

File[] listOfFiles = file.listFiles();

// Looping is done for printing the array

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

// Print by listing all the files and folders of the given path

System.out.println(listOfFiles[i].getName());

}

//Checking whether the file not exists

if(!file.exists()) {

// throwing error if the directory does not exist

System.out.println("The directory name does not exist");

}

}

}

}