newDirectFloatBuffer() description

> Hi
>
> I'm looking for a detailed description of the method
> newDirectFloatBuffer().
>
> Looking at the JavaDoc I get a 1 liner.
>
> I found the following at
> https://sites.google.com/site/justinscsstuff/rendering-methods/vertex-arrays
>
> "
> We cannot use normal Java arrays in the glVertexPointer,
> glColorPointer, glNormalPointer, and glTexCoordPointer functions.
> Instead, we must use direct buffers; these are buffers that use memory
> outside of the Java heap. Using a direct buffer means garbage
> collection will never relocate the data stored in these arrays around
> inside the heap; the buffer uses a fixed area in the operating
> system's memory.
> In JOGL, functions that have untyped parameters (GLvoid*) with
> deferred use (not used immediately) must use direct buffers. The
> pointer functions above are examples of this: the data inside the
> buffers isn't used until glDrawArrays is called. If a non-direct
> buffer was used, garbage collection may occur between glVertexPointer
> and glDrawArrays, potentially causing the memory address of the buffer
> to change, and who knows what glDrawArrays would actually render!
> Direct buffers are also nice for Java programs that have higher memory
> requirements - which is often the case when working with graphics -
> because you're not limited by the size of the Java heap.
> "
>
> but curious how accurate this is without a formal description at jogamp.
>
> Thanks
>
> Graham