Java.io.RandomAccessFile.write() Method

Description

The java.io.RandomAccessFile.write(byte[] b) method writes b.length bytes from the specified byte array to this file, starting at the current file pointer.

Declaration

Following is the declaration for java.io.RandomAccessFile.write() method

public void write(byte[] b)

Parameters

• b -- the data.

Return Value

This method does not return a value.

Exception

• IOException -- if an I/O error occurs.

Example

The following example shows the usage of java.io.RandomAccessFile.write() method.

package com.tutorialspoint;

import java.io.*;

public class RandomAccessFileDemo {

   public static void main(String[] args) {
      try {
         byte[] b = {1};
         // create a new RandomAccessFile with filename test
         RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

         // write a byte in the file
         raf.write(b);

         // set the file pointer at 0 position
         raf.seek(0);

         // print the Byte
         System.out.println("" + raf.readByte());
      } catch (IOException ex) {
         ex.printStackTrace();
      }

   }
}

Assuming we have a text file c:/test.txt, which has the following content. This file will be used as an input for our example program:

ABCDE  

Let us compile and run the above program, this will produce the following result:

1