Editing Non-blocking I/O (Java) (section)

====Usage====
NIO buffers maintain several pointers that dictate the function of their accessor methods. The NIO buffer implementation contains a rich set of methods for modifying these pointers:
* The <code>flip()</code> method, rather than performing a "flip" or paging function in the canonical sense, moves the ''position'' pointer to the origin of the underlying array (if any) and the ''limit'' pointer to the former position of the ''position'' pointer.
* Three <code>get()</code> methods are supplied for transferring data out of a NIO buffer. The bulk implementation, rather than performing a "get" in the traditional sense, "puts" the data into a specified array. The "offset" argument supplied to this method refers not to the offset from within the buffer from which to read, nor an offset from the ''position'' pointer, but rather the offset from 0 within the target array.
* Unless using the absolute <code>get()</code> and <code>put()</code> methods, any <code>get()</code> or <code>put()</code> is conducted from the ''position'' pointer. Should one need to read from a different position within the underlying array, whilst not adjusting the ''writing'' position, the <code>mark()</code> and <code>reset()</code> methods have been supplied.
* The <code>mark()</code> method effectively stores the position of the ''position'' pointer by setting the ''mark'' pointer to the position of the ''position'' pointer. The <code>reset()</code> method causes the ''position'' pointer to move to the ''mark'' pointer's position.
* Upon invocation of the <code>clear()</code> method or the <code>flip()</code> method the ''mark'' pointer is discarded.
* The <code>clear()</code> method does not ensure zero-ing of the buffer, but does return the ''limit'' pointer to the upper boundary of the underlying array, and the ''position'' pointer to zero.
* <code>put()</code> and <code>get()</code> operations for NIO buffers are not thread safe.
* You can only <code>map()</code> a {{Javadoc:SE|package=java.nio|java/nio|MappedByteBuffer}} from a {{Javadoc:SE|package=java.nio.channels|java/nio/channels|FileChannel}} up to <code>Integer.MAX_VALUE</code> in size (2GiB); regions beyond this limit can be accessed using an offset greater than zero.