不同设计模式解决的问题（完善中。。）

具体的设计模式，网上有很多介绍。本人参见 journaldev

模式	解决问题
Builder	Too Many arguments to pass from client program to the Factory class
Factory	when we have a super class with multiple sub-classes and based on input, we need to return one of the sub-class
Prototype	When u need clone an existing object (shallow or deep copy)
Strategy	Define multiple algorithms and let client application pass the algorithm to be used as a parameter
Decorator	modify the functionality of an object at runtime
Composite	When we need to create a structure in a way that the objects in the structure has to be treated the same way
Bridge	Using abstract class replacing implement class to decouple
Facade	Unify a set of interfaces in a subsystem
Template method	define common functions in abstract class for all sub class