对自定义XML文件的读、写、修改、删除操作，加入简单类工厂和单例模式，便于扩展。打包成DLL，EX为测试项-XML documents to read, write, modify, delete operations, adding a simple type of plant and single-case model, convenient for extension. Packaged into a DLL, EX test items

简单工厂模式 简单工厂模式 简单工厂模式 -Simple Factory PatternSimple Factory PatternSimple Factory Pattern

几个简单设计模式的应用包括工厂模式、策略模式等-The application of a few simple design patterns including factory pattern, strategy pattern

java简单工厂模式入门,比较适合初学者学习-Java simple introduction to the factory pattern, more suitable for beginners to learn