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Java Program to Create a New File

  • Last Updated : 02 Aug, 2021

A File is an abstract path, it has no physical existence. It is only when “using” that File that the underlying physical storage is hit. When the file is getting created indirectly the abstract path is getting created. The file is one way, in which data will be stored as per requirement.

Primary, in order to create a new file, inbuilt files and functions are used which definitely will throw Exceptions here playing it safe. So in order to deal with it, we will be using Exception Handling Techniques. Here, we will use one of them known as- try-catch block techniques. 

Secondary, additional work is simply we will be importing File Class for which we will be importing File Class.

Syntax: To import file library or Classes

import java.util.File ;

Syntax: To create a new file



File object_name = new File(Directory)

Syntax: To specify a directory is different in different operating systems (suppose java file is in a folder named ‘Folder’ is created on desktop)

In Linux and Mac

/Users/mayanksolanki/Desttop/Folder/

In Windows: ‘ \\ ‘ used instead of  ‘ / ‘ to escape ‘ \ ‘ character. So the same directory is accessed as

\\Users\\mayanksolanki\\Desktop\\Folder\\

There are two standards methods to create a new file either directly with the help of File class or indirectly with the help of FileOutputStream by creating an object of the file in both the approaches.

  • By using File Class
  • By using FileOutputStream Class

File Class

FileOutputStreamClass

It is a class which is just a handle for  It is an output stream that can be written to FileOutputStream JavaDoc
Method: File.createNewFile()

Method: FileOutputStream 

Example: echo > myFile.txt



It is used for those objects which are not having physical existence It is used for those objects which are already existing

Both classes provide some methods which are mainly used to do operations regarding file. For example, to create, to write, to compare two path names, to check whether a specific file is present or not, and many more. To understand this topic, first, considering one example for both approaches.

  1. Terminal Command used to compile any java code on the machine
  2. Terminal Command used to Run any java code on the machine
  • javac class_name.java // For Compilation 
     
  • java class_name       // For Execution 
     

Terminal of Mac operating system will be used for implementation and providing an output of accessing the directory

Directory Used : /Users/mayanksolanki/Desktop/Folder/ 

Method 1: Create a new file using File class 

Java




// Java Program to create new file using File class
 
// Importing new files
import java.io.File;
import java.io.BufferedReader;
 
// Importing as it converts bits to strings
import java.io.InputStreamReader;
 
public class GFG {
 
    // Main Driver Method
    public static void main(String args[])
    {
        // Creating New File via funnction
        GFG gfg = new GFG();
        gfg.newFile();
    }
 
    // Function To Make New File
    public void newFile()
    {
        String strPath = "", strName = "";
 
        // Try-catch Block
        try {
 
            // Creating BufferedReadered object
            BufferedReader br = new BufferedReader(
                new InputStreamReader(System.in));
            System.out.println("Enter the file name:");
 
            // Reading File name
            strName = br.readLine();
            System.out.println("Enter the file path:");
 
            // Reading File Path
            strPath = br.readLine();
 
            // Creating File Object
            File file1
                = new File(strPath + "" + strName + ".txt");
 
            // Method createNewFile() method creates blank
            // file.
            file1.createNewFile();
        }
 
        // Try-Catch Block
        catch (Exception ex1) {
        }
    }
}

 
 

Output: 

 

Name of file to be added                    : newFile.txt
Directory where file is to be added         : /Users/mayanksolanki/Desktop/Folder/



Added fie name            : newFile.txt
Added file name directory : /Users/mayanksolanki/Desktop/Folder/

Explanation:

 

  1. To create a new file using java language, the “File” class is used here. “BufferedReader” and “InputStreamReader” both classes are used to make file names and paths from the user as input. These classes are located inside “java.io” package. So to make use of those classes, it is necessary to import those classes at the beginning of the program.
  2. Here class is created namely, “GFG”. And inside that class “main()” method is defined from which execution will be started.
  3. Inside “main()” method object of class is created. And this object is used to call “newFile()” method.
  4. Outside of main() method, newFile() method is declared which is covers code for taking input from the user and create the file as per input.
     
  5. As the file have it’s own name and path, it is necessary to give a name for the file (which we want to create) and path (where to create the file) for file. In this line, two blank strings are declared namely, strName, strPath. “strName  and strPath are used to store name and path of file, when the user give this information.
  6. To take file name and path from the user as input, here BufferedReader class and InputStreamReader class used. The object of BufferedReader “br” is useful to take input values given by the user.
  7. This line print some text to give an indication to the user like ”Enter the file name:”. To print the text “println()” function is used.
  8. Here “readLine()” method is used to take input and store it, in strName and strPath.
  9. Here object of the File class is created and as a parameter, file path and name are given to the constructor. In this line of code “.txt” is a format of the file. You can change it as per need. The object of File class is necessary to call methods provided in its class.
     
  10. Here “createNewFile()” method is called with the help of File class object. This method creates a blank file on a given directory path.
  11. Lastly, enclosed by “try{ }” block. Because, methods like readLine() and createNewFile() methods generates exception. So to handle that exception try, the catch is used.

 Method 2: Create a new file using FileOutputStream class

 

Java




// Java Program to create new file
// using FileOutputStream class
 
// Importing File Classes
import java.io.FileOutputStream;
 
// Importing BuffferedReader Class for taking input
import java.io.BufferedReader;
 
// Importing as it converts bits to strings
import java.io.InputStreamReader;
 
// Function Helping Create New File
public class GFG {
 
    // Main Driver Method
    public static void main(String args[])
    {
        // Creating File Object
        GFG gfg = new GFG();
        gfg.newFile();
    }
 
    // Function To Create A New File
    public void newFile()
    {
        String strFilePath = "", strFileName = "";
 
        // Try-Catch Block
        try {
 
            // Creating BufferClass Object
            BufferedReader br = new BufferedReader(
                new InputStreamReader(System.in));
            System.out.println("Enter the file name:");
 
            // Asking file name from User
            strFileName = br.readLine();
            System.out.println("Enter the file path:");
 
            // Asking file path from User
            strFilePath = br.readLine();
 
            // Creating Object of FileOutputStream Class
            FileOutputStream fos = new FileOutputStream(
                strFilePath + "" + strFileName + ".txt");
        }
 
        // Try-Catch Block
        catch (Exception ex1) {
        }
    }
}

 
 

Explanation:

 

In the second example, the File class is not used to create a new File programmatically.

 

  1. To create a new file using java language, “FileOutputStream” class is used here and “BufferedReader” &  “InputStreamReader” both are used to take file name and path from the user as input. These classes are located inside of “java.io” package. So to make use of those classes, it is necessary to import them at the beginning of the program.
  2. Class is created namely, “GFG”. And inside that class “main()” method is defined from which execution will be started.
  3. Inside of “main()” method object of the class is created. And this object is used to call “newFile()” method.
  4. Outside of main() method, newFile() method is declared which is covers code for taking input from the user and create a file as per input.
  5. In this line, two blank strings are declared namely, strFileName, strFilePath. “strFileName  and strFilePath are used to store the name and path of the file, when the user gives this information.
  6. To take file name and path from the user as input, here BufferedReader class and InputStreamReader class used. The object of BufferedReader “br” is useful to take input values given by the user.
  7. This line print some text to give an indication to the user like ”Enter the file name:”. To print text “println()” function is used.
  8. Here “readLine()” method is used to take input and store it, in strFileName and strFilePath.
  9. Here object of FileOutputStream class is created and as parameter, file path and name are given to the constructor. In this line of code “.txt” is a format of file. You can change it as per need. The object of FileOutputStream class is necessary to call methods provided in its class. For example, if the user wants to store some text in newly created file programmatically then, write() method is helpful.
  10. Lastly, enclosed by “try{ }” block. Because, readLine() method generates exception. So to handle that exception try, catch block is used.

Output: It will be the same as the previous one because just the approach to create a new file has changed the rest of the file name and the directory where it is added remains the same.

 

Added fie name            : newFile.txt
Added file name directory : /Users/mayanksolanki/Desktop/Folder/

 

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