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About Byron Kiourtzoglou

Byron Kiourtzoglou
Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

Get byte from ByteBuffer

With this example we are going to demonstrate how to read bytes from a ByteBuffer. Additionally we will show you several of ByteBuffer‘s API methods in order to share some light on how to randomly ready data from it.
 
 
 
 
 
 
 

package com.javacodegeeks.snippets.core;

import java.nio.ByteBuffer;

public class GetByteFromByteBuffer {
	
	public static void main(String[] args) {

		// Create a byte array
		byte[] bytes = { 0x00, 0x01, 0x02, 0x03, 0x04};

		// Wrap a byte array into a buffer
		ByteBuffer buf = ByteBuffer.wrap(bytes);
		
		// Get the buffer's capacity
		int capacity = buf.capacity();
		
		// Get the buffer's limit
		int limit = buf.limit();
		
		// Get the buffer's position
		int position = buf.position();
		
		System.out.println("Buffer capacity: " + capacity);
		System.out.println("Buffer limit: " + limit);
		System.out.println("Buffer position: " + position);

		// Absolute get method. Reads byte at given index (does not affect the position)
		byte b = buf.get(2);
		System.out.println("byte: " + b);
		
		// Set the position
		buf.position(3);

		// Relative get method. Reads byte at buffer's current position and increments position.
		b = buf.get();
		System.out.println("byte: " + b);
		
		// Get remaining byte count
		int remainingBytes = buf.remaining();
		System.out.println("Buffer remaining bytes: " + remainingBytes);
		
		// Rewinds this buffer. The position is set to zero and the mark is discarded
		buf.rewind();
		
		remainingBytes = buf.remaining();
		System.out.println("Buffer remaining bytes: " + remainingBytes);
		
		b = buf.get();
		System.out.println("byte: " + b);
		
	}

}

Output:

Buffer capacity: 5
Buffer limit: 5
Buffer position: 0
byte: 2
byte: 3
Buffer remaining bytes: 1
Buffer remaining bytes: 5
byte: 0

This was an example of how to read bytes from a ByteBuffer in Java.

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