java files create

Create a File

To create a file in Java, you can use the createNewFile() method. This method returns a

boolean value: true if the file was successfully created, and false if the file

already exists. Note that the method is enclosed in a try...catch

block. This is necessary because it throws an IOException if an error occurs (if the

file cannot be created for some reason):

Example

import java.io.File;  // Import the File class

import java.io.IOException;  // Import the IOException class to handle errors



public class CreateFile {

  public static void main(String[] args) {

    try {

      File myObj = new File("filename.txt");

      if (myObj.createNewFile()) {

        System.out.println("File created: " + myObj.getName());

      } else {

        System.out.println("File already exists.");

      }

    } catch (IOException e) {

      System.out.println("An error occurred.");

      e.printStackTrace();

    }

  }

}

The output will be:

File created: filename.txt

To create a file in a specific directory (requires permission), specify the path of the file and use double backslashes to escape the "\" character (for Windows). On Mac and Linux you can just write the path, like: /Users/name/filename.txt

Example

File myObj = new File("C:\\Users\\MyName\\filename.txt");

Run Example »

Write To a File

In the

following example, we use the FileWriter class together with its write() method

to write some text to the file we created in the example above. Note that when you are done writing to the file,

you should close it

with the close() method:

Example

import java.io.FileWriter;   // Import the FileWriter class

import java.io.IOException;  // Import the IOException class to handle errors



public class WriteToFile {

  public static void main(String[] args) {

    try {

      FileWriter myWriter = new FileWriter("filename.txt");

      myWriter.write("Files in Java might be tricky, but it is fun enough!");

      myWriter.close();

      System.out.println("Successfully wrote to the file.");

    } catch (IOException e) {

      System.out.println("An error occurred.");

      e.printStackTrace();

    }

  }

}

The output will be:

Successfully wrote to the file.

To read the file above, go to the Java Read Files chapter.