Factory Patterns : Factory Method and Abstract Factory

Factory pattern是一個關於創建物件的一種模式，將創建物建的過程抽象化，

並且將相關建立的資訊隱藏起來，並使得物件的初始化盡可能的與平台(系統)或其他物件組成關係為低相依性

(其實這邊是要講system independent)

• Class creational patterns focus on the use of inheritance to decide the object to be instantiated --> Factory Method


• Object creational patterns focus on the delegation of  the instantiation to another object --> Abstract Factory