I read the chapter 4 of head first design pattern just now.I just sum up my thought about the factory pattern.
The factory pattern contains three pattern in general.here are they.the first is simple factory,the second
is factory method pattern ,and the last is abstract factory pattern.the three factory pattern all encapsulate the
creation of the object to low the coupling .
The factory method pattern define an interface for creating the objects ,but lets the subclass decide which
object to create. so it lets a class defer instantiation to the subclass. and The abstract factory pattern provide
an interface for creating families of the related or dependent objects without specifying the concrete class .
what'more ,the abstract factory pattern use the factory pattern to create one concrete object of the family. in
addition,the abstract factory pattern show us a oo design principle -dependency inversion principle.this principle
require us to design my system like this.we should let both high level component and the low level component
depend the abstraction,not to let the high level component depend the low level component.
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