A question about patterns in JAVA and GDI

I have two questions.

1. Windows GDI is an abstraction as you can write to any display surface
and that display surface may be a display or a printer or anything.

My question is which design pattern is used here.
( is it abstract factory or something else? )

2. In java a ByteReader instance can be passed to any FileReader or SocketReader
So related classes can be passed to as an arguments.
Which is this design pattern

In article <84f7f54c.0410180521.1d3fde86@posting.google.com>, on 18 Oct 2004 06:21:25 -0700,
m_gn@yahoo.com (Mandar) wrote:

| I have two questions.
|
| 1. Windows GDI is an abstraction as you can write to any display surface
| and that display surface may be a display or a printer or anything.
|
| My question is which design pattern is used here.
| ( is it abstract factory or something else? )
|
| 2. In java a ByteReader instance can be passed to any FileReader or SocketReader
| So related classes can be passed to as an arguments.
| Which is this design pattern

http://www.soberit.hut.fi/tik-76.278/group6/awtpat.html
http://www.developer.com/tech/print.php/617501

<davidp />

--
David Postill