How to Create a ByteBuffer using Byte Array in java.

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How to Create a ByteBuffer using Byte Array in java.
Posted on: July 26, 2010 at 12:00 AM

In this tutorial you will see how to Create a ByteBuffer using Byte Array in java.

How to create a ByteBuffer using Byte Array in java.

In this tutorial, we will discuss how to creates a buffer using byte array. The ByteBuffer
class is a container for handling data.The ByteBuffer class is available in java.nio package.

The java.nio.ByteBuffer class extends java.nio.Buffer class. It provides the following methods:

Return type	Method	Description
static ByteBuffer	wrap(byte array)	The wrap method create a byte buffer by wrapping the associated byte arrray.
final int	capacity()	The capacity() method returns the capacity of associated buffer.

code


import java.nio.*;

import java.io.FileInputStream;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;



public class ByteArrayBuffer {

  public static void main(String[] args) throws Exception {

    byte[] size = new byte[255];

    FileInputStream finStream = new FileInputStream(args[0]);

    System.out.println("Name of file : " + args[0]);

    FileChannel fchannel = finStream.getChannel();

    ByteBuffer bytebuf = ByteBuffer.wrap(size);

    fchannel.read(bytebuf);

    System.out.println("Capacity of ByteArraytBuffer : "

        + bytebuf.capacity());

  }

}

Following is the output if you run the application:

C:\>java ByteArrayBuffer C:\Work\Bharat\load\ByteArrayBuffedr\bharat.txt
Name of file :C:\Work\Bharat\load\ByteArrayBuffedr\bharat.txt
Capacity of ByteArraytBuffer : 255

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