how to reverse the bytes inside the buffer using java

Question

I have a buffer contains Two bytes lets imagine the buffer is: org.jboss.netty.buffer.ChannelBuffer buffer[28,29,30,31,32] to read the two fisrt bytes in java we use this function :

buffer.readShort()

but what i want to do is to read the buffer from 29 to 28(i want to reverse the order of the bytes).

Answer 1

Since this is not your objects, you will have to read the Byte yourself using readByte .

For a Short, create an array of Byte[2] and call the method twice to fill it :

byte[] shortByte = {
    channel.readByte(),
    channel.readByte()
}

Then reverse it or simpler

byte[] shortByte = new byte[2];
shortByte[1] = channel.readByte();
shortByte[0] = channel.readByte();

Then, from this, you just need to create the Short from this array. You can see how from the following post : Convert a byte array to integer in java and vice versa