常见的设计模式具体代码实现，如，适配器模式、state ,strategy, builder ,composite ,singleton ,factory method, abstract method等等。十分具有指导意义，由本人亲自操作编写。

条形码打印原码开发,适用于工厂打印标签,自己开发的,能够打印-Bar code print source code development, applicable to the factory to print labels, their own development, capable of printing