This is an example of how to put bytes into a ByteBuffer in Java. Additionally we will demonstrate several ofByteBuffer‘s API methods in order to share some light on how to randomly write data to it.
 
 
 
 
 
 
 
 

package com.javacodegeeks.snippets.core;import java.nio.ByteBuffer;public class PutByteIntoByteBuffer {public static void main(String[] args) {// Allocate a new non-direct byte buffer with a 5 byte capacity// The underlying storage is a byte array.ByteBuffer buf = ByteBuffer.allocate(5);// Get the buffer's capacityint capacity = buf.capacity();// Get the buffer's limitint limit = buf.limit();// Get the buffer's positionint position = buf.position();System.out.println("Buffer capacity: " + capacity);System.out.println("Buffer limit: " + limit);System.out.println("Buffer position: " + position);buf.put((byte)0x01); // at position 0position = buf.position();System.out.println("Buffer position: " + position);// Set the positionbuf.position(3);position = buf.position();System.out.println("Buffer position: " + position);// Use the relative put()buf.put((byte)0x02);position = buf.position();System.out.println("Buffer position: " + position);// Get remaining byte countint remainingBytes = buf.remaining();System.out.println("Buffer remaining bytes: " + remainingBytes);// Rewinds this buffer. The position is set to zero and the mark is discardedbuf.rewind();remainingBytes = buf.remaining();System.out.println("Buffer remaining bytes: " + remainingBytes);}}

Output:

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Buffer capacity: 5Buffer limit: 5Buffer position: 0Buffer position: 1Buffer position: 3Buffer position: 4Buffer remaining bytes: 1Buffer remaining bytes: 5

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

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