How to get specific index value from ByteBuffer in java.

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How to get specific index value from ByteBuffer in java.
Posted on: July 26, 2010 at 12:00 AM

In this tutorial you will see how to get specific index value from ByteBuffer in java.

How to get specific index value from ByteBuffer in java.

In this tutorial, we will discuss how to get value of a given index from buffer. The ByteBuffer
class is a container for handling data. The get(int index) method of ByteBuffer class returns value
of a given index. The method allocate( int capacity) creates a new byte buffer, and the current position
will be zero and its limit will be it's capacity.

About ByteBuffer API:

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

Return type	Method	Description
static ByteBuffer	allocate( int capacity)	The allocate() method create a byte buffer of specified capacity.
byte	get(int index)	The get() method reads bytes at given index from buffer.

code


import java.io.*;

import java.nio.*;

import java.io.FileInputStream;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;



public class GetIndexValue {

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

    int index = 4;

    FileInputStream aFile = new FileInputStream("testfile1.txt");

    FileInputStream bFile = new FileInputStream("testfile2.txt");

    FileChannel inChannel = aFile.getChannel();

    FileChannel inChannelb = bFile.getChannel();

    ByteBuffer buf = ByteBuffer.allocate(256);

    int bytesRead = inChannel.read(buf);

    buf.flip();

  System.out.println("Value in first buffer at index " + index + ": "

        + (char) buf.get(index));

    buf.clear();

    int bytesReadb = inChannelb.read(buf);

    buf.flip();

  System.out.println("Value in second buffer at index " + index + ":
  "

        + (char) buf.get(index));

   }

}

output

C:\Work\Bharat\load\getSpecified value>java GetIndexValue
Value in first buffer at index 4 : r
Value in second buffer at index 4 : a

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