工厂模式有：简单工厂模式；工厂方法模式；抽象工厂模式。抽象的程度越来越强，给出了三种模式的java代码，想完全理解还要仔细研究。-Factory pattern: simple factory pattern factory method model abstract factory pattern. Growing degree of abstraction is given three kinds of models java code, and would like to fully