http://gsraj.tripod.com/design/creational/factory/factory.html
http://blog.naver.com/erunc0?Redirect=Log&logNo=60029549507
The Problem
One of the goals of object-oriented design is to delegate responsibility among different objects. This kine of partitioning is good since it encourages Encapsulation and Delegation.
The Solution
Factory Method is a creational pattern. This pattern helps to model an interface for creating an object which at creation time can let its subclasses decide which class to instantiate.
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