the traditional Web applications, and under most circumstances developers have
developers are also rare. But nowadays, with the share of the rich client Web
code and deal with the changing of requirements becomes the urgent problem that
patterns put forward by GoF (Erich Gamma, Richard Helm, Ralph Johnson, and John
M. Vlissides) are welcomed by developers all over the world. As for the
article I will show you how to apply the six popular design patterns from GoF
Now, let us delve into these interesting patterns one-by-one.