How to create new file in given disk drive in Java?



Problem Statement :


Write a program in Java that creates a new file in given disk drive.

How to create a new file in given disk drive in Java?
Create new file in given drive in Java


Concept
:


We need to use createNewFile() method of File class that is present in java.io.* package. We are using below File constructor to create File class instance.

File file=new File(filepath);

Algorithm :


  1. Validate drive letter and file name. Drive letter should be character and file name should have proper extension, for example - .txt, .pdf, .doc etc.
  2. Check whether given file already exists in given drive or not.
  3. If the file exists then no need to create file again otherwise create a new file.


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 new file?
 *
 */
public class CreateFile {

 public static void main(String[] args) throws IOException {

  Scanner input = null;
  BufferedReader br = null;

  try {
   boolean result = false;
   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 file name with extension : ");
   String fileName = br.readLine();
   if (isValidFileName(fileName)) {
    result = createNewFile(ch, fileName);
    if (result) {
     System.out.println("File " + fileName + " successfully created in " + ch + " drive.");
    }
   } else {
    System.out.println("Enter file name correctly!");
   }
  } catch (InputMismatchException e) {
   System.out.println("Enter drive letter correctly!");
  } finally {
   if (input != null) {
    input.close();
   }
   if (br != null) {
    br.close();
   }
  }
 }

 private static boolean createNewFile(char ch, String fileName) {

  // Creating File reference.
  File file = new File(ch + ":\\" + fileName);
  boolean result = false;
  // Checking whether file exist or not in given path.
  if (file.exists()) {
   System.out.println("File " + fileName + " already exist in " + ch + " drive.");
  } else {
   try {
    result = file.createNewFile();
   } catch (IOException e) {
    System.out.println("Error occured in creating new file.\n" + e.getMessage());
   }

  }
  return result;
 }

 private static boolean isValidFileName(String fileName) {

  String pattern = "^.+\\..+$";
  boolean result = false;
  if (fileName.matches(pattern)) {
   result = true;
  }
  return result;
 }

}




Output :


Output of Java program that creates a new file in given drive.
Output - How to create a new file in Java?



After the execution of above program
new file in given directory.
demo.txt file in d drive


References
:


https://docs.oracle.com/javase/7/docs/api/java/io/File.html

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

https://en.wikipedia.org/wiki/Regular_expression

https://docs.oracle.com/javase/7/docs/api/java/io/BufferedReader.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 file, if else, Scanner, BufferedReader, File, String, Regular Expressions, InputStreamReader, java.io.

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How to create new file in given disk drive in Java? How to create new file in given disk drive in Java? Reviewed by Rohit Agarwal on 3/22/2017 Rating: 5

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