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	https://github.com/puwd-git/design-pattern#24种设计模式24-design-pattern
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	https://github.com/puwd-git/design-pattern#一创建型模式
	https://github.com/puwd-git/design-pattern#1单例模式singleton
	https://github.com/puwd-git/design-pattern#意图保证一个类仅有一个实例并提供一个访问它的全局访问点
	https://github.com/puwd-git/design-pattern#主要解决一个全局使用的类频繁地创建与销毁
	https://github.com/puwd-git/design-pattern#何时使用当您想控制实例数目节省系统资源的时候
	https://github.com/puwd-git/design-pattern#如何解决判断系统是否已经有这个单例如果有则返回如果没有则创建
	https://github.com/puwd-git/design-pattern#关键代码构造函数是私有的
	https://github.com/puwd-git/design-pattern#2工厂方法模式factory-method
	https://github.com/puwd-git/design-pattern#意图定义一个创建对象的接口让其子类自己决定实例化哪一个工厂类工厂模式使其创建过程延迟到子类进行
	https://github.com/puwd-git/design-pattern#主要解决主要解决接口选择的问题
	https://github.com/puwd-git/design-pattern#何时使用我们明确地计划不同条件下创建不同实例时
	https://github.com/puwd-git/design-pattern#如何解决让其子类实现工厂接口返回的也是一个抽象的产品
	https://github.com/puwd-git/design-pattern#关键代码创建过程在其子类执行
	https://github.com/puwd-git/design-pattern#3抽象工厂模式abstract-factory
	https://github.com/puwd-git/design-pattern#意图提供一个创建一系列相关或相互依赖对象的接口而无需指定它们具体的类
	https://github.com/puwd-git/design-pattern#主要解决主要解决接口选择的问题-1
	https://github.com/puwd-git/design-pattern#何时使用系统的产品有多于一个的产品族而系统只消费其中某一族的产品
	https://github.com/puwd-git/design-pattern#如何解决在一个产品族里面定义多个产品
	https://github.com/puwd-git/design-pattern#关键代码在一个工厂里聚合多个同类产品
	https://github.com/puwd-git/design-pattern#4建造者模式builder
	https://github.com/puwd-git/design-pattern#意图将一个复杂的构建与其表示相分离使得同样的构建过程可以创建不同的表示
	https://github.com/puwd-git/design-pattern#主要解决主要解决在软件系统中有时候面临着一个复杂对象的创建工作其通常由各个部分的子对象用一定的算法构成由于需求的变化这个复杂对象的各个部分经常面临着剧烈的变化但是将它们组合在一起的算法却相对稳定
	https://github.com/puwd-git/design-pattern#何时使用一些基本部件不会变而其组合经常变化的时候
	https://github.com/puwd-git/design-pattern#如何解决将变与不变分离开
	https://github.com/puwd-git/design-pattern#关键代码建造者创建和提供实例导演管理建造出来的实例的依赖关系
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