Retrieves this buffer's byte order.
The byte order of a long buffer created by allocation or by wrapping an existing
long array is the native order
of the underlying hardware. The byte order of a long buffer created as a view of a byte buffer is that of the byte buffer at the moment that the view is created.
- This buffer's byte order
Implemented in java::nio::HeapLongBuffer, and java::nio::HeapLongBufferR.