This is an example of how to put bytes into a ByteBuffer in Java. Additionally we will demonstrate several of ByteBuffer‘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 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);
buf.put((byte)0x01); // at position 0
position = buf.position();
System.out.println("Buffer position: " + position);
// Set the position
buf.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 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);
}
}
Output:
Buffer capacity: 5
Buffer limit: 5
Buffer position: 0
Buffer position: 1
Buffer position: 3
Buffer position: 4
Buffer remaining bytes: 1
Buffer remaining bytes: 5
This was an example of how to write bytes in a ByteBuffer in Java.
