Computer Software Talk

alepuzio · Guest

Hi!
I'm insteresting by a few of time about design pattern. In the book
"Design Pattern" of Gangs Of Four I read that some pattern is in
compile time (i.e. Abstract Factory) and others are in run-time (es.
Decorator).
I don't understand this point: the decorator pattern in Java language
is used for I/O package.

BufferedReader stdin = new BufferedReader(new
InputStreamReader(System.in)

This is an example of pattern decorator but I know at compile-time the
structure of variable stdin because in compile time ( when I read the
source code) I see the constructor.
What's means the run-time (when the code runs) in this case?

Excuse-me for the level of questions and for my English :)

Bye