在开发网站的时候,我们经常要用到Factory Method模式与Abstract Factory模式,但它们有很多相似之处,大家容易搞混,那它们到底有那些区别呢?
Factory Method模式:Factory Method模式使一个类的实例化延迟到子类,具体来讲,就是Factory Method模式将创建对象实例的责任转移到工厂类,也就是说在工厂类里面,定义对象的实例化。
Abstract Factory模式:Abstract Factory模式是一系列对象的创建,所以在抽象工厂类里面要创建一系列的对象的实例化,而不是单个对象的实例化。 切记这一系列对象存在一定的联系。
演示代码一:
大家知道数据库有 SQL数据库与甲骨文数据库,现实当中我们有时候需要变换不同的数据库访问 以下采用Factory Method模式做这个变换效果
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结果输出:访问的是SQL数据库
演示代码二:
大家都知道衣服 有纽扣 也有衣领, 纽扣 衣领这些小东西一般需要交给加工厂单独来制作,在这里我们假设在中国加工厂制作称为中国的衣服(中国制造),在美国加工厂制作称为美国的衣服(美国制造)。以下采用abstractFactory模式来演示。
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结果输出:中国的纽扣
中国的衣领