Relative <i>get</i> method for reading a long value.
<p> Reads the next eight bytes at this buffer's current position,
composing them into a long value according to the current byte order,
and then increments the position by eight. </p>
@return The long value at the buffer's current position
@throws BufferUnderflowException
If there are fewer than eight bytes
remaining in this buffer
Relative <i>get</i> method for reading a long value.
<p> Reads the next eight bytes at this buffer's current position, composing them into a long value according to the current byte order, and then increments the position by eight. </p>
@return The long value at the buffer's current position
@throws BufferUnderflowException If there are fewer than eight bytes remaining in this buffer