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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 ...
May 21, 2010 · A very simple way to create and write to a file in Java: public static void main(String[] args) {. try{. // Create new file. String content = "This is the content to write into create file"; String path="D:\\a\\hi.txt"; File file = new File(path); // If file doesn't exists, then create it. if (!file.exists()) {.
Code sample
byte data[] = ...FileOutputStream out = new FileOutputStream("the-file-name");out.write(data);out.close();- Overview
- Write with BufferedWriter
- Write with PrintWriter
- Write with FileOutputStream
- Write with RandomAccessFile
- Write with FileChannel
- Write with Files Class
- Write to A Temporary File
- Lock File Before Writing
- Notes
In this tutorial, we’ll explore different ways to write to a file using Java. We’ll make use of BufferedWriter, PrintWriter, FileOutputStream, DataOutputStream, RandomAccessFile, FileChannel, and the Java 7 Filesutility class. We’ll also look at locking the file while writing and discuss some final takeaways on writing to file. This tutorial is par...
Let’s start simple and use BufferedWriter to write a String to a new file: The output in the file will be: We can then append aString to the existing file: The file will then be:
Next, let’s see how we can use PrintWriter to write formatted text to a file: The resulting file will contain: Note how we’re not only writing a raw String to a file, but also some formatted text with the printfmethod. We can create the writer using FileWriter, BufferedWriter, or even System.out.
Let’s now see how we can use FileOutputStream to write binary data to a file. The following code converts a String into bytes and writes the bytes to a file using FileOutputStream: The output in the file will of course be:
Let’s now illustrate how to write and edit inside an existing filerather than just writing to a completely new file or appending to an existing one. Simply put: We need random access. RandomAccessFileenables us to write at a specific position in the file given the offset — from the beginning of the file — in bytes. This code writes an integer value...
If we are dealing with large files, FileChannel can be faster than standard IO. The following code writes String to a file using FileChannel:
Java 7 introduces a new way of working with the filesystem, along with a new utility class: Files. Using the Filesclass, we can create, move, copy, and delete files and directories. It can also be used to read and write to a file:
Now let’s try to write to a temporary file. The following code creates a temporary file and writes a Stringto it: As we can see, it’s just the creation of the temporary file that is interesting and different. After that point, writing to the file is the same.
Finally, when writing to a file, we sometimes need to make extra sure that no one else is writing to that file at the same time. Basically, we need to be able to lock that file while writing. Let’s make use of FileChannel to try locking the file before writing to it: Note that if the file is already locked when we try to acquire the lock, an Overla...
After exploring so many methods of writing to a file, let’s discuss some important notes: 1. If we try to read from a file that doesn’t exist, a FileNotFoundExceptionwill be thrown. 2. If we try to write to a file that doesn’t exist, the file will be created first and no exception will be thrown. 3. It is very important to close the stream after us...
Sep 8, 2022 · There are many ways to write into a file in Java as there are many classes and methods which can fulfill the goal as follows: Using writeString () method. Using FileWriter Class. Using BufferedWriter Class. Using FileOutputStream Class. Method 1: Using writeString () method. This method is supported by Java version 11.
- Reader, InputStreamReader, FileReader and BufferedReader. Reader is the abstract class for reading character streams. It implements the following fundamental methods
- Writer, OutputStreamWriter, FileWriter and BufferedWriter. Writer is the abstract class for writing character streams. It implements the following fundamental methods
- Character Encoding and Charset. When constructing a reader or writer object, the default character encoding of the operating system is used (e.g. Cp1252 on Windows)
- Java Reading from Text File Example. The following small program reads every single character from the file MyFile.txtand prints all the characters to the output console
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How to write text to a file in Java?
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What is Java filewriter class in Java?
Aug 3, 2022 · FileWriter: FileWriter is the simplest way to write a file in Java. It provides overloaded write method to write int, byte array, and String to the File. You can also write part of the String or byte array using FileWriter. FileWriter writes directly into Files and should be used only when the number of writes is less.
String s = "Hello World! "; byte data[] = s.getBytes(); ByteBuffer bb = ByteBuffer.wrap(data); Path file = Paths.get("./permissions.log"); try (SeekableByteChannel sbc = Files.newByteChannel(file, options, attr)) { sbc.write(bb); } catch (IOException x) { System.out.println("Exception thrown: " + x); } } }
