一个类似OutLook风格的界面，类似格式工厂的界面，对于界面编程很有参考意义-OutLook a similar style of interface, similar to the format of the factory interface, a good reference for the significance of interface programming

想学习在代码中运用工厂模式的,可以下载下来看看(Want to study in your code to use the factory pattern, can download and see)