JAVA Convert short[] to byte[]

Method 1：

byte [] ShortToByte_ByteBuffer_Method(short [] input)
{
  int index;
  int iterations = input.length;

  ByteBuffer bb = ByteBuffer.allocate(input.length * 2);

  for(index = 0; index != iterations; ++index)
  {
    bb.putShort(input[index]);    
  }

  return bb.array();       
}

Method 2:

byte [] ShortToByte_Twiddle_Method(short [] input)
{
  int short_index, byte_index;
  int iterations = input.length;

  byte [] buffer = new byte[input.length * 2];

  short_index = byte_index = 0;

  for(/*NOP*/; short_index != iterations; /*NOP*/)
  {
    buffer[byte_index]     = (byte) (input[short_index] & 0x00FF); 
    buffer[byte_index + 1] = (byte) ((input[short_index] & 0xFF00) >> 8);

    ++short_index; byte_index += 2;
  }

  return buffer;
}