How to create new directory inside directory in Java?

Problem Description :

Write a program in Java that creates a new directory inside the directory.

Create new directory inside directory in Java

Concept :

We can solve this problem with the help of mkdir() method of File class that is present in java.io package. We will use following two constructors of File class to create file class instance.

                                             File file=new File(directorypath);

            File file=new File(directoryname,filename);

Algorithm :

1. Validate drive letter. Drive letter should be character.
2. Check whether given directory already exists in given drive or not? 
3. If directory exists then no need to create new directory otherwise create directory.
4. Check whether new directory exists in given directory or not?
5. If directory exists then no need to create new directory otherwise create directory.

Java Program :

	package com.javamultiplex.filehandling;
	import java.io.BufferedReader;
	import java.io.File;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.util.InputMismatchException;
	import java.util.Scanner;
	/**
	*
	* @author Rohit Agarwal
	* @category File Handling
	* @problem How to create a directory inside directory?
	*
	*/
	public class CreateDirectoryInsideDirectory {
	public static void main(String[] args) throws IOException {
	Scanner input = null;
	BufferedReader br = null;
	try {
	int result = 0;
	input = new Scanner(System.in);
	br = new BufferedReader(new InputStreamReader(System.in));
	System.out.println("Enter drive letter : ");
	char ch = input.next(".").charAt(0);
	System.out.println("Enter directory name : ");
	String directoryName = br.readLine();
	System.out.println("Enter new directory : ");
	String newDirectory = br.readLine();
	result = createNewDirectory(ch, directoryName, newDirectory);
	if (result == 1) {
	System.out.println("Directory " + newDirectory + " successfully created in directory " + ch + ":\\" + directoryName);
	} else if (result == 0) {
	System.out.println("Error occured, path doesn't exist.");
	}
	} catch (InputMismatchException e) {
	System.out.println("Enter drive letter correctly!");
	} finally {
	if (input != null) {
	input.close();
	}
	if (br != null) {
	br.close();
	}
	}
	}
	private static int createNewDirectory(char ch, String directoryName, String newDirectoryName) {
	// Creating File reference.
	File directory = new File(ch + ":\\" + directoryName);
	// If directory doesn't exist then creating a new directory.
	if (!directory.exists()) {
	directory.mkdir();
	}
	// Creating File reference.
	File file = new File(directory, newDirectoryName);
	boolean result = false;
	int flag = 0;
	// Checking whether directory exist or not in given path.
	if (file.exists()) {
	System.out.println("Directory " + newDirectoryName + " already exist in directory " + ch + ":\\" + directoryName);
	flag = 2;
	} else {
	result = file.mkdir();
	if (result) {
	flag = 1;
	}
	}
	return flag;
	}
	}

view raw CreateDirectoryInsideDirectory.java hosted with ❤ by GitHub

Output :

Output - How to create a new directory inside given directory in Java?

After the execution of above program

Directory "demo" inside directory "D:\javamultiplex"

References :

https://docs.oracle.com/javase/7/docs/api/java/io/File.html#exists()

https://docs.oracle.com/javase/7/docs/api/java/io/File.html#mkdir()

https://docs.oracle.com/javase/7/docs/api/java/lang/String.html

Thank you friends, I hope you have clearly understood the solution of this problem. If you have any doubt, suggestion or query please feel free to comment below. You can also discuss this solution in our forum.

Tags : File Handling, Create new directory inside directory, if else, Scanner, BufferedReader, File, String, Regular Expressions, InputStreamReader, java.io, mkdir(), exists().

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