Java.io.RandomAccessFile.write() Method

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Description

The java.io.RandomAccessFile.write(byte[] b,int off,int len) method writes len bytes from the specified byte array starting at offset off to this file.

Declaration

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

public void write(byte[] b,int off,int len)

Parameters

• b − The data.

• off − The start offset in the data.

• len − The number of bytes to write.

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, 2, 3, 4, 5, 6};
         
         // create a new RandomAccessFile with filename test
         RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

         // write 2 bytes in the file
         raf.write(b, 2, 2);

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

         // print the two bytes we wrote
         System.out.println("" + raf.readByte());
         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 −

3
4