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Java - create and write file

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Created by:
Kourtney-White
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In this article, we would like to show you how to create and write files in Java.

There are several methods to create and write files in Java:

  • Files.newBufferedWriter (Java 8)
  • Files.write (Java 7)
  • FileOutputStream (Java 7)
  • File.createNewFile
  • PrintWriter

1. Files.newBufferedWriter

In this example, we use Files.newBufferedWriter() method to create a new example.txt file and write some text inside it. If the file already exists, the content will be overwritten.

import java.io.BufferedWriter;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Example {

    public static void main(String[] args) {
        String filename = "C:\\path\\example.txt";
        Path path = Paths.get(filename);

        // create and write to the example.txt file
        try (BufferedWriter writer = Files.newBufferedWriter(path, StandardCharsets.UTF_8)) {
            writer.write("Dirask is the best!");

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Result:

Java - Files.newBufferedWriter method result
Java - Files.newBufferedWriter method result

2. Files.write

In this example, we use Files.write() method to create a new example.txt file and write some text inside it. If the file already exists, the content will be overwritten.

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;

public class Example {

    public static void main(String[] args) {
        String filename = "C:\\path\\example.txt";
        String text = "Dirask is the best!";

        // create and write to the example.txt file
        try {
            Files.write(
                    Paths.get(filename),
                    text.getBytes(StandardCharsets.UTF_8));

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Result:

Java - Files.write() method result
Java - Files.write() method result

3. FileOutputStream

In this example, we use FileOutputStream to create a new example.txt file and write some text inside it. If the file already exists, the content will be overwritten.

import java.io.*;

public class Example {

    public static void main(String[] args) {
        // create and write to the example.txt file
        try {

            OutputStream file = new FileOutputStream("C:\\path\\example.txt");
            String text = "Dirask is the best!";

            // converts string into byte array    
            byte b[] = text.getBytes();

            file.write(b);
            file.close();

            System.out.println("File write ended successfully.");

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

4. File.createNewFile

The File.createNewFile() method returns:

  • true - if the file doesn't exist and was created successfully,
  • false - if the file is already exists

In this example, we use File.createNewFile method to create a new example.txt file and  FileWriter to write some text inside it. If the file exists, the FileWriter will overwrite the content.

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class Example {

    public static void main(String[] args) {
        String filename = "C:\\path\\example.txt";

        // create example.txt file
        try {

            File file = new File(filename);

            if (file.createNewFile()) {
                System.out.println("File created successfully!");
            } else {
                System.out.println("File already exists.");
            }

            // write to file
            try (FileWriter writer = new FileWriter(file)) {
                writer.write("Dirask is the best!");
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Output:

File created successfully!

Result:

Java - File.createNewFile() with FileWriter result
Java - File.createNewFile() with FileWriter result

5. PrintWriter

In this example, we use PrintWriter class to create a new example.txt file and write some text inside it. If the file already exists, the content will be overwritten.

import java.io.IOException;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;

public class Example {

    public static void main(String[] args) {
        String filename = "C:\\path\\example.txt";
        String text = "Dirask is the best!";

        // create and write to the example.txt file
        try (PrintWriter writer = new PrintWriter(filename, StandardCharsets.UTF_8)) {

            writer.println("line 1");
            writer.println("line 2");
            writer.println("line 3");

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Result:

Java - create and write file using PrintWriter - result
Java - create and write file using PrintWriter - result

Java - file operations

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